Tootfinder

On angular momentum algebras and their relations
Kieran Calvert, Marcelo De Martino, Roy Oste
https://arxiv.org/abs/2508.18454 https://arxiv.org/pdf/2508.1…

On angular momentum algebras and their relations
In this paper, we study the centraliser of $\mathfrak{osp}(1|2)$, denoted the total angular momentum algebra (TAMA), in the Weyl Clifford algebra. The TAMA extends the angular momentum algebra (AMA), which arises as the centraliser of $\mathfrak{sl}(2)$ and admits a diagrammatic presentation via the crossing relation described by Feigin and Hakobyan. Using Young symmetrisers we construct an analogue relation for the even subalgebra of the TAMA. We prove that for rank $4$ and $5$ these rela…

A Charge Constraint in BMN
Yoav Zigdon
https://arxiv.org/abs/2506.19924 https://arxiv.org/pdf/2506.19924

A Charge Constraint in BMN
I derive a new charge constraint that ties the four angular momenta in a $\frac{1}{16}$-BPS sector of the Berenstein, Maldacena, and Nastase (BMN) supersymmetric $U(N)$ matrix quantum mechanics. The result is related to the charge constraint of the $U(N)$, $\mathcal{N}=4$ Super-Yang-Mills (SYM) conformal field theory by identifying three SYM charges with three BMN angular momenta generating $SO(6)$, two equal SYM angular momenta with a BMN angular momentum of $SO(3)$, and scaling $N^2$ by $3$. …

Quantum dynamics in confined pseudo-harmonic oscillator in a time-dependent moving
Akash Halder, Amlan K. Roy, Debraj Nath
https://arxiv.org/abs/2506.21280

Quantum dynamics in confined pseudo-harmonic oscillator in a time-dependent moving
In this work, we present analytical solution of Schrödinger equation of confined pseudoharmonic potential in presence of a moving boundary condition, for an arbitrary angular momentum state. It turns out that an important quantity to probe the problem is internuclear distance ratio, which depends on the solution of Ermakov equation. The minimum value of time-dependent (TD) Heisenberg uncertainty product always remains greater than that of the minimum uncertainty product h/2. The TD average ene…

Fast Vortex Beam Alignment for OAM Mode Multiplexing in LOS MIMO Networks
Poorya Mollahosseini, Yasaman Ghasempour
https://arxiv.org/abs/2508.19034 https://

Fast Vortex Beam Alignment for OAM Mode Multiplexing in LOS MIMO Networks
Orbital Angular Momentum (OAM)-based communication systems offer high-capacity multiplexing in line-of-sight (LOS) scenarios; yet, their performance is sensitive to nodal misalignment, which disrupts modal orthogonality, hindering the data multiplexing gain. To tackle this challenge, we present OrthoVortex, a novel framework that estimates the misalignment angles and applies the appropriate phase correction to restore orthogonality between modes. Unlike purely theoretical prior efforts that rel…

Relativistic Oscillating Window Driven by an Intense Laguerre Gaussian Laser Pulse
Yao Meng, Runze Li, Longqing Yi
https://arxiv.org/abs/2506.21407 https:/…

Relativistic Oscillating Window Driven by an Intense Laguerre Gaussian Laser Pulse
High-order harmonic generation by the diffraction of an intense Laguerre-Gaussian (LG) laser beam through a small aperture is studied. It is found that the 2D peripheral electron dynamics on the rim can facilitate complex interplay between the spin and orbital angular momentum interaction, which leads to distinct selection rules for LG pulses with different polarization states. In particular, when the driver is linearly polarized, the harmonic beams no longer follow a simple orbital angular mom…

Exploring Data-Driven Corrections for $\phi$-Meson Global Spin Alignment Measurements
C. W. Robertson, Yicheng Feng, Fuqiang Wang
https://arxiv.org/abs/2508.18409 https://

Exploring Data-Driven Corrections for $ϕ$-Meson Global Spin Alignment Measurements
Non-central heavy ion collisions generate large orbital angular momentum (OAM), providing opportunities to study spin phenomena such as the global spin alignment of vector mesons. Such studies are expected to reveal properties of the quark-gluon plasma produced in these collisions. Global spin alignment of vector mesons, such as the $ϕ$-meson, can be measured by the $00^{\rm th}$ coefficient of the spin density matrix, $ρ_{00}$, via the polar angle of the decay kaon momentum in the parent res…

Angular phase-space integrals with four denominators through Mellin--Barnes
Taushif Ahmed, Syed Mehedi Hasan, Andreas Rapakoulias
https://arxiv.org/abs/2508.15952 https://

Angular phase-space integrals with four denominators through Mellin--Barnes
We compute four-denominator angular phase-space integrals using the Mellin--Barnes (MB) technique in dimensional regularisation. Independent of the scattering process, an angular integral can be categorised based on the nature of the momenta appearing in the denominators. We address all scenarios involving fully massless and massive momenta. We present a partial fraction decomposition that relates angular integrals with multiple massive momenta to those with a single massive momentum. By solvin…

$\textit{BMAD}$-Circumbinary Magnetically Arrested Disks around Stellar or Black Hole Binaries: Hot Accretion Flows, Disk Properties, and Angular Momentum Transfer
Hai-Yang Wang, Elias R. Most, Philip F. Hopkins
https://arxiv.org/abs/2508.16855

$\textit{BMAD}$-Circumbinary Magnetically Arrested Disks around Stellar or Black Hole Binaries: Hot Accretion Flows, Disk Properties, and Angular Momentum Transfer
Binary systems surrounded by a circumbinary accretion flow can be subject to strong magnetic fields, potentially altering the character of the accretion flow itself, the evolution of the orbital dynamics, and outflow properties from the system. Here we focus on a regime where magnetic fields become so strong that the outer circumbinary flow becomes magnetically arrested, establishing a (circum)binary magnetically arrested disk ($\textit{BMAD}$) state. Such flows feature quasi-periodic magnetic …

Charge constraint on M87* with twisted light
Fabiano Feleppa, Fabrizio Tamburini, Gaetano Lambiase
https://arxiv.org/abs/2508.17300 https://arxiv.org/pdf/2…

Charge constraint on M87* with twisted light
We propose a novel method to constrain the electric charge of the supermassive black hole M87* by analyzing the orbital angular momentum content of the light it emits. By leveraging the established analogy between rotating spacetimes and inhomogeneous optical media, we derive a simple analytical formula that relates the average orbital angular momentum in the observed radiation to the black hole's charge-to-mass ratio. Applying this relation to existing observational data, we place an upper bou…

Angular-momentum-selective nanofocusing with Weyl semimetals
Marco Peluso, Alessandro De Martino, Reinhold Egger, Francesco Buccheri
https://arxiv.org/abs/2506.18503

Angular-momentum-selective nanofocusing with Weyl semimetals
We investigate the theory of surface plasmon polaritons on a magnetic Weyl semimetal conical tip. We show that the axion term in the effective electrodynamics modifies the surface plasmon polariton dispersion relation and allows all modes with a given sign of the orbital angular momentum to be focused at the end of the tip. This is in contrast with normal metals, in which only one mode can reach the end. We discuss how this orbital angular momentum nanofocusing expands the potential of technolo…

Optically Addressing Circularly-Polarized Vibrations in Molecules
Chientzu Lin, Connor K. Terry Weatherly, Roel Tempelaar
https://arxiv.org/abs/2506.20827 …

Optically Addressing Circularly-Polarized Vibrations in Molecules
Circularly-polarized (CP) vibrations are the nuclear-motion analog of CP light, emerging in molecules with non-Abelian point-group symmetry that support orthogonal and degenerate vibrational normal modes. Here, we explore the optical addressability of CP vibrations, motivated by their potential as nanoscale angular momentum states suitable for information storage and manipulation. We investigate how symmetry-breaking chemical modifications affect a molecule's capacity to support CP vibrations. …

Radiated Angular Momentum from Spinning Black Hole Scattering Trajectories
Gustav Mogull, Jan Plefka, Kathrin Stoldt
https://arxiv.org/abs/2506.20643 https…

Radiated Angular Momentum from Spinning Black Hole Scattering Trajectories
Using the worldline quantum field theory approach we derive solutions to the equations of motion for spinning massive bodies up to quadratic order in spins. At leading post-Minkowskian (PM) order these trajectories are obtained in the time domain, and at sub-leading order in the frequency domain. Our approach incorporates diagrammatic techniques and modern Feynman integration technologies, and includes a new family of loop integrals different to those seen in asymptotic PM calculations. Our res…

The angular momentum distribution of electrons in large atoms and its deviation from Madelung's rule
August Bjerg, S{\o}ren Fournais, Peter Hearnshaw, Jan Philip Solovej
https://arxiv.org/abs/2506.14227

The angular momentum distribution of electrons in large atoms and its deviation from Madelung's rule
We show that the angular momentum distribution of neutral atoms, in the sense of occupation numbers, follows the Thomas-Fermi angular momentum distribution in the limit of large atomic number. In particular, we show that the angular momentum distribution of large atoms deviates from the well-known Madelung rule.

Interior rotation modelling of the $\beta$ Cep pulsator HD 192575 including multiplet asymmetries
V. Vanlaer, D. M. Bowman, S. Burssens, S. Bharati Das, L. Bugnet, S. Mathis, C. Aerts
https://arxiv.org/abs/2506.19948

Interior rotation modelling of the $β$ Cep pulsator HD 192575 including multiplet asymmetries
Rotation plays an important role in stellar evolution. However, the mechanisms behind the transport of angular momentum in stars at various stages of their evolution are not well understood. To improve our understanding of these processes, it is necessary to measure and validate the internal rotation profiles of stars across different stages of evolution and mass regimes. Our aim is to constrain the internal rotation profile of the 12Msun $β$ Cep pulsator HD 192575 from the observed pulsationa…

Classification of color superconductivity by one-gluon exchange helicity amplitudes and renormalization group equations
Yuki Fujimoto
https://arxiv.org/abs/2508.19222 https://…

Classification of color superconductivity by one-gluon exchange helicity amplitudes and renormalization group equations
Quark matter at high baryon density exhibits diverse pairing patterns classified by color, flavor, and angular momentum quantum numbers. We compute one-gluon exchange (OGE) helicity amplitudes and introduce a nonrelativistic classification of the pairing channel, justified by the channel decomposition in a Lorentz-noninvariant medium and the decoupling of renormalization group flows at leading order. We find the new attractive channel in OGE; the medium effects can render the vacuum-repulsive c…

Compact Analytical Model for Real-Time Evaluation of OAM-Based Inter-Satellite Links
Mohammad Taghi Dabiri, Mazen Hasna
https://arxiv.org/abs/2506.20823 ht…

Compact Analytical Model for Real-Time Evaluation of OAM-Based Inter-Satellite Links
This paper presents an efficient analytical framework for evaluating the performance of inter-satellite communication systems utilizing orbital angular momentum (OAM) beams under pointing errors. An accurate analytical model is first developed to characterize intermodal crosstalk caused by beam misalignment in OAM-based inter-satellite links. Building upon this model, we derive efficient expressions to analyze and optimize system performance in terms of bit error rate (BER). Unlike traditional …

Search for binary companions around millisecond pulsars
Arpita Choudhary
https://arxiv.org/abs/2507.18669 https://arxiv.org/pdf/2507.18669

Search for binary companions around millisecond pulsars
It is believed that the radio pulsars rotating at spin periods of about 30 millisecond or even lower got such high spins through the transfer of angular momentum by accreting matter from their binary companions (or past companions) in the past. Around 35% of MSPs are known to be isolated, some of the which might actually be in binaries - either not timed very well to obtain the signature of the orbit or in extremely wide binaries that can be revealed only through very accurate timing, as in the…

Programmable spatiotemporal OAM optical toroidal beams with completely tunable properties
Andrew V. Komonen, Nicolas K. Fontaine, Martin Pl\"oschner, Marcos Maestre Morote, David T. Neilson, Joel Carpenter, Mickael Mounaix
https://arxiv.org/abs/2506.20365

Programmable spatiotemporal OAM optical toroidal beams with completely tunable properties
Spatiotemporal toroidal orbital angular momentum (OAM) beams are a developing class of spatiotemporal beams which have key applications within quantum physics, metrology, imaging and optical manipulation. However, the full realization of these applications require complete configurability within tunable temporal duration, 3D geometric structure and OAM charge of these beams along with amplitude, phase and polarization control. In this paper, we demonstrate complete configurability of programmab…

Anomalous Energy Injection in Turbulent Neutron Star Cores
Anirudh Sivakumar, Pankaj Kumar Mishra, Ahmad A. Hujeirat, Paulsamy Muruganandam
https://arxiv.org/abs/2506.20577

Anomalous Energy Injection in Turbulent Neutron Star Cores
Neutron star glitches -- sudden increases in rotational frequency -- are thought to result from angular momentum transfer via quantized vortices in the superfluid core. Using a two-dimensional rotating atomic Bose-Einstein condensate with phenomenological damping and a pinning potential to mimic the crust, we model the dynamics underlying these events. Our simulations reveal a transient Kolmogorov-like turbulent cascade ($k^{-5/3}$) that transitions to a Vinen-like scaling ($k^{-1}$). We identi…

$T_{bc\bar s}$ states in the process $\Upsilon \to D^{-} \bar B^{0} D_s^{ }$
Wen-Ying Liu, Hua-Xing Chen
https://arxiv.org/abs/2508.19007 https://arxiv.org…

$T_{bc\bar s}$ states in the process $Υ\to D^{-} \bar B^{0} D_s^{+}$
We perform a theoretical study of the decay process $Υ\to D^{-} \bar{B}^{0} D_s^{+}$ in search of the doubly heavy tetraquark states $T_{bc\bar{s}}$ with quark content $bc\bar{s}\bar{d}$. These $T_{bc\bar{s}}$ states are assumed to be dynamically generated molecular states from the S-wave interactions between $\bar{B}_s^{(*)0} D^{(*)+}$ and $\bar{B}^{(*)0} D_s^{(*)+}$ meson pairs. Based on the total angular momentum and the type of the constituent mesons (pseudoscalars $P$ or vectors $V$), the…

Massive extended streamers feed high-mass young stars
Fernando A. Olguin, Patricio Sanhueza, Adam Ginsburg, Huei-Ru Vivien Chen, Kei E. I. Tanaka, Xing Lu, Kaho Morii, Fumitaka Nakamura, Shanghuo Li, Yu Cheng, Qizhou Zhang, Qiuyi Luo, Yoko Oya, Takeshi Sakai, Masao Saito, Andr\'es E. Guzm\'an
https://arxiv.org/abs/2508.15889…

Massive extended streamers feed high-mass young stars
Stars are born in a variety of environments that determine how they gather gas to achieve their final masses. It is generally believed that disks are ubiquitous around protostars as a result of angular momentum conservation and are natural places to grow planets. As such, they are proposed to be the last link in the inflow chain from the molecular cloud to the star. However, disks are not the only form that inflows can take. Here we report on high-resolution observations performed with the Atac…

Bridging the gap: consistent modeling of protoplanetary disk heating and gap formation by planet-induced spiral shocks
Satoshi Okuzumi, Takayuki Muto, Ryosuke T. Tominaga, Shizu Shimizu
https://arxiv.org/abs/2507.18283

Bridging the gap: consistent modeling of protoplanetary disk heating and gap formation by planet-induced spiral shocks
A giant planet embedded in a protoplanetary disk excites spiral density waves, which steepen into shocks as they propagate away from the planet. These shocks lead to secular disk heating and gap opening, both of which can have important implications for the evolution of solids near the planet. To date, these two effects have largely been modeled independently. In this study, we present a self-consistent model that unifies these processes by linking shock heating and angular momentum deposition …

Perturbations of massless external fields on magnetically charged black holes in string-inspired Euler-Heisenberg theory
Xufen Zhang, De-Cheng Zou, Chao-Ming Zhang, Ming Zhang, Rui-Hong Yue
https://arxiv.org/abs/2508.17736

Perturbations of massless external fields on magnetically charged black holes in string-inspired Euler-Heisenberg theory
In this paper, we study the perturbations of massless scalar and electromagnetic fields on the magnetically charged black holes in string-inspired Euler-Heisenberg theory. We calculate the quasinormal frequencies (QNFs) and discuss influences of black hole magnetic charge $Q_m$, coupling parameter $ε$ and angular momentum $l$ on QNFs, emphasizing the relationship between these parameters and QNMs behavior. We find these results obtained through the AIM method are in good agreement with those o…

Theory of infrared magneto-optical effects from chiral phonons in solids
Chiara Fiorazzo, Cheol-Hwan Park, Ivo Souza, Matteo Calandra
https://arxiv.org/abs/2506.11258

Theory of infrared magneto-optical effects from chiral phonons in solids
In crystals with broken time-reversal symmetry, zone-center phonons can acquire a finite angular momentum via velocity-dependent forces on the nuclei. Despite having the same order of magnitude as the electron spin angular momentum, the phonon angular momentum can be hard to detect because the frequency splitting is small. Here, by developing a theory of lattice magneto-optical effects in reflection and transmission, we show that infrared magnetic circular dichroism is a sensitive probe of zone…

Evolutionary Period Changes for 25 X-ray Binaries and the Measurement of an Empirical Universal Law for Angular Momentum Loss in Accreting Binaries
Bradley E. Schaefer (Louisiana State University)
https://arxiv.org/abs/2507.13515

Evolutionary Period Changes for 25 X-ray Binaries and the Measurement of an Empirical Universal Law for Angular Momentum Loss in Accreting Binaries
I measure and collect timings of phase markers (like eclipse times) for the orbits of 25 X-ray binaries (XRBs) so as to calculate the steady evolutionary period change ($\dot{P}$). I combine these with my observed $\dot{P}$ measures from 52 cataclysmic variables (CVs). Further, I subtract out the contributions from gravitational radiation ($\dot{P}_{\rm GR}$) and mass transfer ($\dot{P}_{\rm mt}$), deriving the period change from the residual unknown angular momentum loss ($\dot{P}_{\rm AML}$=$…

The effects of no-slip boundaries and external force torque on two-dimensional turbulence in a square domain
Alisa Shikanian, Vladimir Parfenyev
https://arxiv.org/abs/2508.13590

The effects of no-slip boundaries and external force torque on two-dimensional turbulence in a square domain
We study two-dimensional turbulence in a square no-slip domain without bottom drag using direct numerical simulations. The dynamics are shown to depend strongly on the torque $M$ of the external forcing. When $M$ is relatively large, a long-lived coherent vortex forms at the domain center, establishing a persistent angular momentum. At lower torques, the angular momentum undergoes random sign reversals due to spontaneous switching of the central vortex circulation, though it predominantly align…

Orbital chiral lasing in twisted bilayer metasurfaces
Mingjin Wang (Laboratory of Solid State Optoelectronics Information Technology, Institute of Semiconductors, CAS, Beijing, China, Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, China, College of Future Technology, University of Chinese Academy of Sciences, Beijing, China…

Orbital chiral lasing in twisted bilayer metasurfaces
Chirality is a fundamental concept in physics that underpins various phenomena in nonlinear optics, quantum physics, and topological photonics. Although the spin of a photon naturally brings chirality, orbital angular momentum can also become chirally active in the structures with a broken mirror symmetry. Here, we observe orbital chiral lasing from a twisted bilayer photonic structure leveraging its inherent structural chirality. Specifically, we design and fabricate a Moire-type optical struc…

Higher derivative corrections to 5-dimensional Kerr-AdS black hole thermodynamics by background subtraction method
Gerui Chen, Xiyao Guo, Xin Lan, Hongbao Zhang, Wei Zhang
https://arxiv.org/abs/2508.18171

Higher derivative corrections to 5-dimensional Kerr-AdS black hole thermodynamics by background subtraction method
We justify the applicability of the background subtraction method to both Einstein's gravity and its higher derivative corrections in 5-dimensional asymptotically AdS spacetimes, where the corresponding higher derivative corrections to the expression for the ADM mass and angular momentum are also worked out. Then we further apply the background subtraction method to calculate the first order corrected Gibbs free energy induced by the higher derivative terms up to the quadratic of Riemann tensor…

Gapless Edge Gravitons and Quasiparticles in Fractional Quantum Hall Systems with Non-Local Confinement
Daniel Spasic-Mlacak, Nigel R. Cooper
https://arxiv.org/abs/2508.18117 ht…

Gapless Edge Gravitons and Quasiparticles in Fractional Quantum Hall Systems with Non-Local Confinement
One of the central tenets of the theory of the fractional quantum Hall effect is that the bulk quantized Hall response requires the existence of a gapless chiral edge mode. The field theoretical arguments for this rely on locality. While locality is typically met in standard experimental settings, it need not always apply. Motivated by experimental capabilities of photonic platforms, we study confining potentials that are step-like in angular momentum, and thus non-local in position. We show th…

Path Integral Monte Carlo in the Angular Momentum Basis for a Chain of Planar Rotors
Est\^ev\~ao de Oliveira, Muhammad Shaeer Moeed, Pierre-Nicholas Roy
https://arxiv.org/abs/2506.14977

Path Integral Monte Carlo in the Angular Momentum Basis for a Chain of Planar Rotors
We introduce a Path Integral Monte Carlo (PIMC) approach that uses the angular momentum representation for the description of interacting rotor systems. Such a choice of representation allows the calculation of momentum properties without having to break the paths. The discrete nature of the momentum basis also allows the use of rejection-free Gibbs sampling techniques. To illustrate the method, we study the collective behavior of $N$ confined planar rotors with dipole-dipole interactions, a sy…

Impact of spin polarization on transport and thermodynamic coefficients
De-Xian Wei
https://arxiv.org/abs/2507.18038 https://arxiv.org/pdf/2507.18038

Impact of spin polarization on transport and thermodynamic coefficients
In this work, we investigate the influence of parton spin polarization on effective transport and thermodynamic coefficients in noncentral light- and heavy-ion collisions. To model this influence, we consider two sources of spin polarization: thermal vorticity, induced by angular momentum, and thermal shear, arising from local velocity gradients. Using a novel kinetic theory framework, we find that transport and thermodynamic coefficients -- including the speed of sound squared $c_{s}^{2}$, spe…

Testing the weak cosmic censorship conjecture via test particle induced overcharging/overspinning of Kerr Newman modified gravity black hole
Waqar Ahmad, Abdul Rehman Kashif
https://arxiv.org/abs/2508.17665

Testing the weak cosmic censorship conjecture via test particle induced overcharging/overspinning of Kerr Newman modified gravity black hole
We investigate the weak cosmic censorship conjecture (WCCC) violation through the absorption of a charged, rotating test particle by Kerr Newman spacetime in modified gravity (KN MOG). The result is sensitive to multiple factors, including the sign of the particle's charge relative to that of the black hole, as well as the direction of rotation of the particle and the black hole. Additionally, the combined effect of the MOG parameter, the black hole's charge and angular momentum plays a signifi…

Three bound states with prescribed angular momentum to the cubic-quintic NLS equations in $\mathbb{R}^{3}$
Shuai Yao, Juntao Sun
https://arxiv.org/abs/2507.04057

Three bound states with prescribed angular momentum to the cubic-quintic NLS equations in $\mathbb{R}^{3}$
In this paper, we investigate bound states with prescribed angular momentum and mass for the nonlinear Schrödinger equations (NLS) with the cubic-quintic nonlinearity in dimensions three. We demonstrate that there exist three solutions for the double constrained problem: a local minimizer, a mountain pass type solution, and a global minimizer. Moreover, by means of the minimax method, we construct a new mountain pass path and further obtain the geometric link among the three solutions as well …

The efficiency of mixed modes for angular momentum transport
Beatriz Bordad\'agua, Felix Ahlborn, Quentin Copp\'ee, Jo\~ao P. Marques, K\'evin Belkacem, Saskia Hekker
https://arxiv.org/abs/2506.13283

The efficiency of mixed modes for angular momentum transport
Core rotation rates of red-giant stars inferred from asteroseismic observations are substantially lower than predicted by current stellar models. This indicates the lack of an efficient angular momentum transport mechanism in radiative interiors. Mixed pressure-gravity modes are a promising candidate to extract angular momentum from the core of red giants. We focus on determining the effect of mixed modes on the rotation rates of stars evolving along the red giant branch (RGB). We developed a p…

Orbital angular momentum of entangled photons as a probe for relativistic effects
Fazilah Nothlawala, Kiki Dekkers, Moslem Mahdavifar, Jonathan Leach, Andrew Forbes, Isaac Nape
https://arxiv.org/abs/2508.01716

Orbital angular momentum of entangled photons as a probe for relativistic effects
Orbital angular momentum (OAM) as both classical and quantum states of light has proven essential in numerous applications, from high-capacity information transfer to enhanced precision and accuracy in metrology. Here, we extend OAM metrology to relativistic scenarios to determine the Lorentz factor of a moving reference frame, exploiting the fact that OAM is not Lorentz invariant. Using OAM correlations of entangled states, we show that their joint OAM spectrum is modified by length contractio…

Angular momentum dynamics of vortex particles in accelerators
D. Karlovets, D. Grosman, I. Pavlov
https://arxiv.org/abs/2507.08763 https://

Angular momentum dynamics of vortex particles in accelerators
Experiments with spin-polarized beams of leptons and hadrons typically employ plane-wave states with definite momenta and energies. In contrast, vortex states represent cylindrical waves carrying a well-defined orbital angular momentum projection along the propagation direction. This projection can be arbitrarily large, endowing such particles with magnetic moments orders of magnitude greater than those of plane-wave states. Consequently, vortex particles could complement - or even replace - sp…

The first phase of mass transfer in low-mass binaries: neither stable nor a common envelope
Gijs Nelemans, Holly Preece, Karel Temmink, James Munday, Onno Pols
https://arxiv.org/abs/2506.16832

The first phase of mass transfer in low-mass binaries: neither stable nor a common envelope
The masses of the white dwarfs in a binary carry information about previous mass-transfer phases. The core mass -- radius relation of low-mass giants gives the size of the progenitor of a helium white dwarf at the moment it last filled its Roche lobe. Previously, we used this information for a few observed systems to propose a new mass-transfer type, based on an angular momentum balance. Our aim is to investigate if stable mass transfer instead of the angular momentum prescription is consiste…

On Supersymmetric D-brane probes in 4d $\mathcal{N}=2$ $\text{AdS}_2\times\mathbf{S}^2$ Attractors
Alberto Castellano, Carmine Montella, Matteo Zatti
https://arxiv.org/abs/2507.17857

On Supersymmetric D-brane probes in 4d $\mathcal{N}=2$ $\text{AdS}_2\times\mathbf{S}^2$ Attractors
We extend the $κ$-symmetry analysis of supersymmetric D-brane probes in the $\mathrm{AdS}_2 \times \mathbf{S}^2$ attractor geometry, originally performed by Simons, Strominger, Thompson, and Yin, to also include stationary -- but non-static -- worldlines carrying angular momentum along the 2-sphere. We demonstrate that certain special trajectories, with fixed radius and orbital velocity, solve the equations of motion and moreover satisfy a supersymmetry preserving condition, thus defining new …

Chiral Phonons in a Cubic Lattice
Hirokazu Tsunetsugu, Hiroaki Kusunose
https://arxiv.org/abs/2508.13570 https://arxiv.org/pdf/2508.13570

Chiral Phonons in a Cubic Lattice
We have developed a theory for the energy dispersion of chiral phonons in a simplest cubic lattice. Among all the phonon modes, only the optical triplet modes exhibit the intrinsic characteristics of chiral phonons near k=0, and we examine their energy splitting in detail by analyzing the dynamical matrix. To first order in k, the splitting is described by a spin-1 Weyl Hamiltonian, and helicity becomes a good quantum number. It asymptotically coincides with the crystal angular momentum for k p…

Angular Momentum Fluctuations in the Phonon Vacuum of Symmetric Crystals
Rule Yi, Violet Williams, Benedetta Flebus
https://arxiv.org/abs/2506.21801 https:…

Angular Momentum Fluctuations in the Phonon Vacuum of Symmetric Crystals
Although time-reversal and inversion symmetry constrain the angular momentum of each phonon mode to vanish, we show that the vacuum state of crystals with such symmetries can nevertheless exhibit finite angular momentum fluctuations. These fluctuations arise from quantum coherence between nondegenerate, orthogonally polarized modes and are encoded in the off-diagonal components of the angular momentum operator. Their origin lies in the noncommutativity between the phonon Hamiltonian and angular…

Kerr spacetime and scalar wave equation: Exact resummation of the renormalized angular momentum in the eikonal limit
Donato Bini, Giorgio Di Russo, Andrea Geralico
https://arxiv.org/abs/2508.12046

Kerr spacetime and scalar wave equation: Exact resummation of the renormalized angular momentum in the eikonal limit
We show that the null geodesic radial action for unbound orbits in the Kerr spacetime, and consequently the scattering angle, can be resummed in terms of hypergeometric functions, extending previous results [M.~M.~Ivanov, et al. arXiv:2504.07862]. We provide explicit expressions as series expansions in powers of the Kerr rotational parameter up the fourth order included. We finally use the Mano-Suzuki-Takasugi formalism to prove the relation between the renormalized angular momentum and the rad…

Energy and photon centroids of spatiotemporal light pulses and consequences for their intrinsic orbital angular momentum
Titouan Gadeyne, Thierry Ruchon
https://arxiv.org/abs/2506.13535

Energy and photon centroids of spatiotemporal light pulses and consequences for their intrinsic orbital angular momentum
An ongoing debate surrounding the intrinsic transverse orbital angular momentum (OAM) attributed to spatiotemporal optical vortex (STOV) light pulses has raised the energy and photon-density centroids as two alternative frameworks to define the center of a free electromagnetic wavepacket. We herein derive, within a single formalism, lowest-order expressions for the positions and velocities of both centroids, directly applicable to an arbitrary scalar, near-paraxial and quasi-monochromatic pulse…

Spin Polarization driven by Itinerant Orbital Angular Momentum in van der Waals Heterostructures
Luis M. Canonico, Jose H. Garc\'ia, Aron W. Cummings, Stephan Roche
https://arxiv.org/abs/2507.12587

Spin Polarization driven by Itinerant Orbital Angular Momentum in van der Waals Heterostructures
We report on the possibility of manipulating magnetic materials by using itinerant orbital angular momentum to produce out-of-plane spin polarization in van der Waals heterostructures. Employing a real-space formulation of the OAM operator within linear response theory, we demonstrate that in low-symmetry transition-metal dichalcogenide (TMD) monolayers, such as 1$T{}_d$-MoTe2, the current-induced itinerant OAM exceeds the spin response by three orders of magnitude. When TMDs are coupled with f…

Nuclear Angular Momentum Generation in Thermally Driven Chiral Systems
Jichen Feng, Ethan Abraham, Joseph Subotnik, Abraham Nitzan
https://arxiv.org/abs/2508.06738 https://

Nuclear Angular Momentum Generation in Thermally Driven Chiral Systems
The appearance of angular momentum in the nuclear motion of molecular systems lacking inversion symmetry under imposed thermal gradients presents a novel mechanism with potential implications for spintronics, magnetic response, and energy transport in such systems. Here we explore this phenomenon, using theoretical analysis and numerical simulations to study angular momentum generation in several driven chiral molecular models. We demonstrate that significant vibrational angular momentum can be…

Conley-Zehnder Indices of Spatial Rotating Kepler Problem
Dongho Lee
https://arxiv.org/abs/2506.14325 https://arxiv.org/pdf/2506.1432…

Conley-Zehnder Indices of Spatial Rotating Kepler Problem
We study periodic orbits in the spatial rotating Kepler problem from a symplectic-topological perspective. Our first main result provides a complete classification of these orbits via a natural parametrization of the space of Kepler orbits, using angular momentum and the Laplace-Runge-Lenz vector. We then compute the Conley-Zehnder indices of non-degenerate orbits and the Robbin-Salamon indices of degenerate families, establishing their contributions to symplectic homology via the Morse-Bott sp…

Thermodynamic relation on rotating charged black strings with arbitrary cosmological constant
Hai-Long Zhen, Meng-Sen Ma, Huai-Fan Li, Jian-Hua Shi, Yu-Bo Ma
https://arxiv.org/abs/2507.18024

Thermodynamic relation on rotating charged black strings with arbitrary cosmological constant
The Goon-Penco (GP) relation was investigated on rotating charged black strings with an arbitrary cosmological constant. It has been demonstrated that the GP relation retains its form in the context of spacetimes described by cylindrical coordinates. In addition, the GP relation is derived in scenarios where the energy state parameters (including angular momentum $J$ and charge $Q$, etc.) are expressed as functions of the perturbation parameter $η$. This finding indicates that the GP relation …

The spin-orbit alignment hypothesis in millisecond pulsars
Alexandra Lorange, J\'er\^ome P\'etri, Matt\'eo Sautron
https://arxiv.org/abs/2507.13893

The spin-orbit alignment hypothesis in millisecond pulsars
Millisecond pulsars (MSPs) are spun up during their accretion phase in a binary system. The exchange of angular momentum between the accretion disk and the star tends to align the spin and orbital angular momenta on a very short time scale compared to the accretion stage. In this work, we study a subset of $γ$-ray MSPs in binaries for which the orbital inclination $i$ has been accurately constrained thanks to the Shapiro delay measurements. Our goal is to constrain the observer viewing angle $…

Measuring the Mean Plane of the Distant Kuiper Belt
Amir Siraj, Christopher F. Chyba, Scott Tremaine
https://arxiv.org/abs/2508.14156 https://arxiv.org/pdf…

Measuring the Mean Plane of the Distant Kuiper Belt
In the absence of any unseen planetary-mass bodies in the outer solar system, the mean plane of the distant Kuiper belt should be the same as the plane orthogonal to the angular momentum vector of the solar system -- the invariable plane. Here, we measure the mean plane of the non-resonant Kuiper belt across semimajor axes 50 - 400 AU. We introduce a new method to measure the mean plane that we demonstrate to be independent of observational bias. In particular, our results are not biased by sur…

The $\sin(2\phi)$ azimuthal asymmetry in exclusive $\pi^0$ production
Chentao Tan, Zhun Lu
https://arxiv.org/abs/2508.15181 https://arxiv.org/pdf/2508.1518…

The $\sin(2ϕ)$ azimuthal asymmetry in exclusive $π^0$ production
The $\sin(2ϕ)$ azimuthal angular correlation between the transverse momenta of the scattered electron and the recoil proton in the $ep\to e^\prime p^\prime π^0$ process provides a probe for quark orbital angular momentum. We numerically calculate this asymmetry for the future Electron-Ion Collider (EIC) in the U.S. and China (EicC) kinematics using a light-front quark-scalar-diquark model, in which the light-front wave functions (LFWFs) are derived from the soft-wall AdS/QCD framework. We als…

Topological Stars and scalar wave equation: Exact resummation of the renormalized angular momentum in the eikonal limit
Donato Bini, Giorgio Di Russo
https://arxiv.org/abs/2506.14442

Topological Stars and scalar wave equation: Exact resummation of the renormalized angular momentum in the eikonal limit
We show that for a Topological Star the renormalized angular momentum parameter, $ν$, appearing in the Mano-Suzuki-Takasugi-type or in the quantum-Seiberg-Witten-type approaches of the perturbation equations, has 1) a direct link with the geodesic radial action computed along the null orbits of the background and 2) admits an exact resummation in terms of hypergeometric functions, generalizing previous results valid in the Schwarzschild case, see Ref.[arXiv:2504.07862 [hep-th]].

Symmetry driven spin anisotropic magnetotransport in quantum spin Hall insulator WTe2 1T
Shrushti Tapar, Bent Weber, Saroj P Dash, 3 Shantanu Mukherjee, Bhaskaran Muralidharan
https://arxiv.org/abs/2507.18543

Symmetry driven spin anisotropic magnetotransport in quantum spin Hall insulator WTe2 1T
We present a comprehensive magnetotransport analysis of monolayer 1T WTe2, highlighting the role of nonsymmorphic symmetries in governing edge-state spin behavior. By comparing the electronic transmission in nanoribbons with edges along the crystallographic y and x directions, our analysis reveals a pronounced anisotropy in the magnetic field response. The y-edge ribbon exhibits significant spin splitting of edge-state bands in both energy and momentum space, along with a strong angular depende…

Towards a Twisted Atom Laser: Cold Atoms Released from Helical Optical Tube Potentials
Amine Jaouadi, Andreas Lyras, Vasileios E. Lembessis
https://arxiv.org/abs/2508.13711 http…

Towards a Twisted Atom Laser: Cold Atoms Released from Helical Optical Tube Potentials
We study the quantum dynamics of cold atoms initially confined in a Helical Optical Tube (HOT) and subsequently released into free space. This helicoidal potential, engineered via structured light fields with orbital angular momentum, imposes a twisted geometry on the atomic ensemble during confinement. We examine how this geometry shapes the initial quantum state particularly its spatial localization and phase structure and how these features influence the subsequent free evolution. Our analys…

Heat kernel bounds for the fractional Laplacian with Hardy potential in angular momentum channels
Krzysztof Bogdan, Konstantin Merz
https://arxiv.org/abs/2506.08115

Heat kernel bounds for the fractional Laplacian with Hardy potential in angular momentum channels
Motivated by the study of relativistic atoms, we prove sharp heat kernel bounds for the Hardy operator $(-Δ)^{α/2}-κ|x|^{-α}$ acting on functions of the form $u(|x|) |x|^{\ell} Y_{\ell,m}(x/|x|)$ in $L^2(\R^d)$, when $α\in(0,2]\cap(0,d+2\ell)$.

Magnetic braking and dynamo evolution of $\beta$ Hydri
A. R. G. Santos, T. S. Metcalfe, O. Kochukhov, T. R. Ayres, R. Gafeira, T. L. Campante
https://arxiv.org/abs/2506.17049

Magnetic braking and dynamo evolution of $β$ Hydri
The evolution of magnetic braking and dynamo processes in subgiant stars is essential for understanding how these stars lose angular momentum. We investigate the magnetic braking and dynamo evolution of $β$ Hydri, a G-type subgiant, to test the hypothesis of weakened magnetic braking and the potential rejuvenation of large-scale magnetic fields. We analyze spectropolarimetric observations from HARPS (HARPSpol; polarimetric mode of High Accuracy Radial velocity Planet Searcher), and combine the…

On the angular momentum of many-nucleon states
Junchao Guo, Yang Sun
https://arxiv.org/abs/2507.00940 https://arxiv.org/pdf/2507.0094…

On the angular momentum of many-nucleon states
We propose a new method to construct total angular momentum of many-nucleon states. We find that when restoring the broken rotational symmetry of the product state by angular momentum projection, the restrictions on the total states required by the fermionic antisymmetry are completely absorbed into the single j space. For different j shells, any total angular momentum that obeys the selection rule is allowed, just as for non-identical particles. Our method based on this reorganization changes …

Optical spin-orbit interaction induced by magnetic textures
Martin Luttmann, Mauro Fanciulli, Pietro Carrara, Maurizio Sacchi, Thierry Ruchon
https://arxiv.org/abs/2506.15232

Optical spin-orbit interaction induced by magnetic textures
Contrary to the optical spin angular momentum (SAM), the role played by the orbital angular momentum (OAM) of light in magneto-optics remains largely unexplored. However, the SAM and OAM are known to be coupled when light interacts with non-homogeneous and non-isotropic materials. Here we predict that the OAM carried by each photon in a light beam is modified upon reflection on magnetic textures like skyrmions, and that the sign of this variation is governed by the SAM of the incident field. Ou…

Imprints of Different Types of Low-Angular-Momentum Accretion Flow Solutions in General Relativistic Hydrodynamic Simulations
Indu K. Dihingia, Akhil Uniyal, Yosuke Mizuno
https://arxiv.org/abs/2506.05750

Imprints of Different Types of Low-Angular-Momentum Accretion Flow Solutions in General Relativistic Hydrodynamic Simulations
Depending on the astrophysical source and its environment, the accretion flows can exhibit a variety of behaviors and characteristics in accordance with the type of solutions. We study low-angular-momentum accretion flows onto black holes using two-dimensional general relativistic hydrodynamic (GRHD) simulations to find imprints of different types of accretion solutions. Such flows, relevant to X-ray binaries and wind-fed low-luminosity active galactic nuclei, often lack sufficient angular mome…

The Star Formation History and Evolution of the Ultra-Diffuse M81 Satellite, F8D1
Adam Smercina, Eric F. Bell, Benjamin F. Williams, Benjamin N. Velguth, Sarah Pearson, Jeremy Bailin, Tsang Keung Chan, Julianne J. Dalcanton, Roelof S. de Jong, Richard D'Souza, Andrew Dolphin, Puragra Guhathakurta, Kristen B. W. McQuinn, Antonela Monachesi, Colin T. Slater, Elisa Toloba, Daniel R. Weisz, Andrew Wetzel

The Star Formation History and Evolution of the Ultra-Diffuse M81 Satellite, F8D1
We present deep HST imaging of one of the nearest ultra-diffuse galaxies (UDGs) outside of the Local Group: F8D1, a satellite of M81 known to be tidally disrupting. UDGs are an enigmatic and diverse population, with evolutionary pathways ranging from tidal processing to bursty feedback and high initial angular momentum. To determine F8D1's evolutionary drivers, we resolve stars in F8D1's central $\sim$1 kpc and in a parallel field $\sim$6 kpc along its major axis to deep photometric limits, rea…

Topological bound states in a lattice of rings with nearest-neighbour interactions
Yunjia Zhai, Ayaka Usui, Anselmo M. Marques, Ricardo G. Dias, Ver\`onica Ahufinger
https://arxiv.org/abs/2508.06272

Topological bound states in a lattice of rings with nearest-neighbour interactions
We study interaction-induced bound states in a system of ultracold bosons loaded into the states with orbital angular momentum in a one-dimensional staggered lattice of rings. We consider the hard-core limit and strong nearest-neighbour interactions such that two particles in next neighbouring sites are bound. Focusing on the manifold of such bound states, we have derived the corresponding effective model for doublons. With orbital angular momentum $l=1$, the original physical system is describ…

Influence of the external electromagnetic field on the properties of the Novikov-Thorne accretion disk in Kerr spacetime
Shiyang Hu, Yuxiang Zuo, Dan Li, Chen Deng
https://arxiv.org/abs/2507.14599

Influence of the external electromagnetic field on the properties of the Novikov-Thorne accretion disk in Kerr spacetime
The Novikov-Thorne accretion disk model is widely employed in astrophysics, yet computing its blackbody spectrum theoretically requires analytical expressions for the orbital parameters -- specific energy, angular momentum, and angular velocity -- of the constituent timelike particles, a task extremely challenging in non-integrable curved spacetimes. In this work, we numerically obtain these orbital parameters for quasi-Keplerian motion in Kerr spacetime with an asymptotically uniform magnetic …

Magnetic Moment vs Angular Momentum: Spin Hall Response in Bismuth
Junji Fujimoto, Yuki Izaki, Yuki Fuseya
https://arxiv.org/abs/2508.07200 https://arxiv.o…

Magnetic Moment vs Angular Momentum: Spin Hall Response in Bismuth
Spin currents can carry either spin angular momentum or its associated magnetic moment, which are no longer strictly proportional in multiband systems. Using a multiband $k \cdot p$ model, we compute the intrinsic spin Hall conductivity tensors of elemental Bi. The magnetic-moment tensor emerges about two orders of magnitude larger and far less anisotropic than the angular-momentum tensor, while quasiparticle damping activates otherwise longitudinal components. The magnetic-moment spin Hall ang…

Quantum state engineering of maximally entangled photon pairs by path identity
Richard Bernecker, Baghdasar Baghdasaryan, Stephan Fritzsche
https://arxiv.org/abs/2508.13638 http…

Quantum state engineering of maximally entangled photon pairs by path identity
Cutting-edge quantum technologies lean on sources of high-dimensional entangled states (HDES) that reliably prepare high-fidelity target states. The idea to overlap photon paths from distinct but indistinguishable sources was recently introduced for the creation of HDES, known as entanglement by path identity. In this regard, the use of orbital angular momentum (OAM) modes is promising, as they offer a high-dimensional and discrete Hilbert space to encode information. While entanglement by path…

Generation of high-power attosecond x-ray FEL pulses carrying orbital angular momentum
Chenzhi Xu, Jiawei Yan, Gianluca Geloni, Christoph Lechner, Haixiao Deng
https://arxiv.org/abs/2506.06908

Generation of high-power attosecond x-ray FEL pulses carrying orbital angular momentum
X-ray beams carrying orbital angular momentum (OAM), are emerging as a powerful tool to probe matter. Recently, a method called self-seeded FEL with OAM (SSOAM) has been proposed to generate high-power x-ray OAM pulses, which places the traditional optical elements in the linear regime of the FEL amplification process before saturation to reduce the thermal load of the optical element. In this work, we propose to utilize the SSOAM scheme to produce attosecond x-ray vortices with high intensity.…

The tidal interaction of an orbiting giant planet with a star near the Kraft break: the excitation of $r$-modes and the retention of orbital and spin angular momenta misalignment
J. C. B. Papaloizou, G. J. Savonije
https://arxiv.org/abs/2508.05894

The tidal interaction of an orbiting giant planet with a star near the Kraft break: the excitation of $r$-modes and the retention of orbital and spin angular momenta misalignment
In this paper we extend the previous work of Papaloizou \& Savonije on tidal interactions between a solar mass star and a closely orbiting giant planet which is such that the orbital and stellar spin angular momentum directions are misaligned. Here we consider the situation when the central star has a mass of $1.3 M_{\odot}$ and is in the vicinity of the Kraft break. We find and determine the properties of the lowest order $r$ modes and the tidal response arising from the secular non axisymmetr…

Geometric spin Hall effect of spatiotemporal optical vortices
Chaokai Yang, Weifeng Ding, Zhaoying Wang
https://arxiv.org/abs/2506.15053 https://

Geometric spin Hall effect of spatiotemporal optical vortices
The geometric spin Hall effect of light (GSHEL), which is associated with nonzero transverse angular momentum, has been demonstrated to occur without the need for light-matter interaction and is characterized by a transverse shift. Recently, there has been a surge in research on spatiotemporal optical vortices (STOV) that carry pure transverse angular momentum. In this study, we examine the transverse shift of STOV in a tilted reference frame with respect to the optical axis. Through both theor…

Catalogue of chiral phonon materials
Yue Yang, Zhenyu Xiao, Yu Mao, Zhanghuan Li, Zhenyang Wang, Tianqi Deng, Yanhao Tang, Zhi-Da Song, Yuan Li, Huiqiu Yuan, Ming Shi, Yuanfeng Xu
https://arxiv.org/abs/2506.13721

Catalogue of chiral phonon materials
Chiral phonons, circularly polarized lattice vibrations carrying intrinsic angular momentum, offer unprecedented opportunities for controlling heat flow, manipulating quantum states through spin-phonon coupling, and realizing exotic transport phenomena. Despite their fundamental importance, a universal framework for identifying and classifying these elusive excitations has remained out of reach. Here, we address this challenge by establishing a comprehensive symmetry-based theory that systemati…

np spin correlations in the deuteron ground state
Ashutosh Singh, Ankit Kumar Das, Ankit Kumar, P. Arumugam
https://arxiv.org/abs/2506.16621 https://

np spin correlations in the deuteron ground state
The deuteron is the simplest atomic nucleus made of two particles - a proton and a neutron. In this work, we study how their spins are quantum entangled with each other. We study two cases: when the deuteron is in a fixed projection of total angular momentum, and when it exists in a superposition of all projections. Our findings show that the spins are most entangled when the total projection is zero, and that strong entanglement still exists even when all spin states are superposed.

Low Angular Momentum Black Hole Accretion: First GRMHD Evidence of Standing Shocks
Jirong Mao, Indu K. Dihingia, Yosuke Mizuno, Shigehiro Nagataki
https://arxiv.org/abs/2507.22506

Low Angular Momentum Black Hole Accretion: First GRMHD Evidence of Standing Shocks
Understanding the dynamics of low angular momentum accretion flow around black holes (BHs) is essential for probing extreme plasma behavior in strong gravity, where shock formation can naturally produce variability signatures. In this paper, we perform general relativistic magnetohydrodynamic (GRMHD) simulations of low angular momentum accretion flows onto a BH with different BH spins to investigate the accretion dynamics near the central BH region. The simulation results show the standard and …

Modulation of energy and angular momentum radiation of two-dimensional altermagnets
Yong-Mei Zhang, Zhi- Ping Niu
https://arxiv.org/abs/2507.08450 https://…

Modulation of energy and angular momentum radiation of two-dimensional altermagnets
This paper investigates the energy and angular momentum radiation of altermagnets under Rashba spin-orbit coupling (RSOC) and external magnetic fields. Using an effective low-energy Hamiltonian, we derive electronic energy bands and calculate optical conductivity via the Kubo formula. Results show that RSOC strength, altermagnet interactions strength, and Neel vector direction notably affect the optical conductivity of altermagnet metals. Energy radiation is highly sensitive to Rashba spin-orbi…

Coherent states of finite-level systems
A. I. Breev, D. M. Gitman
https://arxiv.org/abs/2506.10668 https://arxiv.org/pdf/2506.10668…

Coherent states of finite-level systems
A method for constructing coherent states (CS) of finite-level systems with a given angular momentum is proposed. To this end we generalize the known spin equation (SE) to an infinite-dimensional Fock space. The equation describes a special quadratic system in the latter space. Its projections on $d$-dimensional subspaces, represent analogs of SE for $d$-dimensional systems in an external electromagnetic field which describe $d$-dimensional systems with a given angular moment. Using a modificat…

Resonant helical dichroism in twisted dielectric metastructures
Yiyuan Wang, Chi Li, Haoyi Yu, Stefan A. Maier, Jinhui Shi, Haoran Ren, Kirill Koshelev
https://arxiv.org/abs/2506.14173

Resonant helical dichroism in twisted dielectric metastructures
Circular dichroism, arising from interactions with light fields of opposite spin angular momentum, has become a fundamental tool for molecular characterization. Meanwhile, helical dichroism (HD) - the dichroic response to vortex beams carrying opposite orbital angular momentum (OAM) - offers an alternative approach for probing chiral molecules and photonic structures. Previous demonstrations of HD have been limited to non-resonant light-matter interactions with chiral micro- and nanostructures,…

A massive, evolved slow-rotating galaxy in the early Universe
Ben Forrest, Adam Muzzin, Danilo Marchesini, Richard Pan, Nehir Ozden, Jacqueline Antwi-Danso, Wenjun Chang, M. C. Cooper, Adit H. Edward, Percy Gomez, Lucas Kimmig, Brian C. Lemaux, Ian McConachie, Allison Noble, Rhea-Silvia Remus, Stephanie M. Urbano Stawinski, Gillian Wilson, M. E. Wisz
https://…

A massive, evolved slow-rotating galaxy in the early Universe
In today's Universe, most galaxies are rotationally supported against gravity. However, a small fraction of the most massive galaxies which are no longer forming stars (i.e., they are quiescent) are dispersion supported, and are termed 'slow-rotators.' These galaxies, which are highly evolved and often exist in dense cluster environments, are theorized to be formed by a history of merger activity that on average decreases the angular momentum of the merged system and disturbs any disk structure…

Gravitational waveforms from inspiraling compact binaries in quadratic gravity and their parameterized post-Einstein characterization
Matheus F. S. Alves, L. G. Medeiros, Davi C. Rodrigues
https://arxiv.org/abs/2507.15571

Gravitational waveforms from inspiraling compact binaries in quadratic gravity and their parameterized post-Einstein characterization
We investigate gravitational waveforms from the inspiral phase of compact binary systems within the framework of quadratic gravity and map their deviations from general relativity into the parameterized post-Einstein (PPE) formalism to constrain the theory parameters. Quadratic gravity generically includes a massive spin-2 ghost, which leads to ill-defined energy and angular momentum fluxes. Following earlier proposals, we remove these unphysical features by imposing a constraint on the massive…

Three-boson scattering hypervolume for a nonzero orbital angular momentum
Pui In Ip, Shina Tan
https://arxiv.org/abs/2507.20787 https://arxiv.org/pdf/2507.…

Three-boson scattering hypervolume for a nonzero orbital angular momentum
We analyze the zero energy collision of three identical bosons in the same internal state with total orbital angular momentum $L=2$, assuming short range interactions. By solving the Schrödinger equation asymptotically, we derive two expansions of the wave function when three bosons are far apart or a pair of bosons and the third boson are far apart. The scattering hypervolume $D$ is defined for this collision. Unlike the scattering hypervolume defined by one of us in 2008, whose dimension is …

Planetesimal Scattering Efficiency of Cold Giant Planet Architectures
Stephen R. Kane, Emma L. Miles
https://arxiv.org/abs/2506.08088 https://

Planetesimal Scattering Efficiency of Cold Giant Planet Architectures
The discovery of many exoplanets has revealed an incredible diversity of orbital architectures. These orbital configurations are intrinsically linked to the potential for habitable environments within the system, since the gravitational influence of the planets governs the angular momentum distribution within the system. This angular momentum distribution, in turn, alters the planetary orbits and rotational obliquities. In the case of giant planets, their gravitational influence can also produc…

Magic of nonlocal geometric force: lighting up optical transition and transporting angular momentum by chiral phonons
Hao Chen, Haoshu Li, Lifa Zhang, Qian Niu
https://arxiv.org/abs/2506.03748

Magic of nonlocal geometric force: lighting up optical transition and transporting angular momentum by chiral phonons
We investigate the impact of the nonlocal geometric force -- arising from the molecular Berry curvature -- on the lattice dynamics of magnetic materials with broken time-reversal symmetry. A first-principles computational framework is established to evaluate this force across the entire Brillouin zone. We apply it to monolayer CoCl$_2$, a ferromagnetic half-semiconductor with a narrow bandgap forbidding direct dipolar optical transition. At the phonon Brillouin zone center, the pronounced nonlo…

Dependence of angular momentum of fission fragments on total kinetic energy in spontaneous fission of $^{252}$Cf
A. Rahmatinejad (Joint Institute for Nuclear Research, Russia), T. M. Shneidman (Joint Institute for Nuclear Research, Russia), G. G. Adamian (Joint Institute for Nuclear Research, Russia), N. V. Antonenko (Joint Institute for Nuclear Research, Russia, Tomsk Polytechnic University, Russia)

Dependence of angular momentum of fission fragments on total kinetic energy in spontaneous fission of $^{252}$Cf
A weak dependence of the angular momentum of $^{144}$Ba fragments, produced in the spontaneous fission of $^{252}$Cf, on the total kinetic energy (TKE) was recently observed \cite{Giha2025}. To investigate this phenomenon, we propose a model describing the evolution of the fissioning nucleus toward scission. The model assumes that after tunneling through the fission barrier, the nucleus can be represented by a superposition of dinuclear systems (DNS). We calculate main fission observables, incl…

Thermalization of Bottomonium in the Quark-Gluon Plasma
Nora Brambilla, Tom Magorsch, Antonio Vairo
https://arxiv.org/abs/2508.11743 https://arxiv.org/pdf/…

Thermalization of Bottomonium in the Quark-Gluon Plasma
We study the approach to equilibrium of bottomonium in the quark-gluon plasma within the open quantum system framework. We perform large-scale simulations of the long-time behavior in three dimensions using the quantum trajectory method to observe the emergence of steady states and determine the timescale of thermalization in position-, angular-momentum-, and color-space. We find that the thermalization timescale increases with decreasing temperature and decreasing coupling to the medium, which…

Isolated attosecond spatio-temporal optical vortices: Interplay between the topological charge and orbital angular momentum scaling in high harmonic generation
Rodrigo Martin-Hernandez, Luis Plaja, Carlos Hernandez-Garcia, Miguel A. Porras
https://arxiv.org/abs/2506.07465

Isolated attosecond spatio-temporal optical vortices: Interplay between the topological charge and orbital angular momentum scaling in high harmonic generation
The propagation properties and the nature of the transverse orbital angular momentum (t-OAM) of spatiotemporal optical vortices (STOVs) open new scenarios in high-harmonic generation (HHG), where the richness of the topological charge and OAM up-conversion are exposed. Through advanced numerical simulations, we demonstrate that HHG driven by spatio-spectral optical vortices produces far-field, extreme-ultraviolet STOV harmonics with non-scaling topological charge, i.e., with the same topologica…

Intrinsic spin distributions in multinucleon transfer reactions
Dan Dan Zhang, Dario Vretenar, Tamara Nik\v{s}i\'c, Peng Wei Zhao, Jie Meng
https://arxiv.org/abs/2507.11905

Intrinsic spin distributions in multinucleon transfer reactions
Time-dependent covariant density functional theory (TD-CDFT) combined with angular momentum projection is developed and applied to study multinucleon transfer (MNT) reactions, with a focus on the intrinsic angular momentum distributions of the final fragments. Using the illustrative reaction $^{40}$Ca + $^{208}$Pb across a range of impact parameters, we find that the MNT process generates broad distributions of intrinsic spins. These distributions arise from the conversion of relative orbital a…

In-medium heavy quark-antiquark $T$-matrix without partial wave expansion
Anurag Tiwari, Min He
https://arxiv.org/abs/2508.11895 https://arxiv.org/pdf/2508…

In-medium heavy quark-antiquark $T$-matrix without partial wave expansion
The T-matrix of the heavy quark-antiquark ($Q\bar{Q}$) pair interacting through a screened Cornell potential in the quark-gluon plasma (QGP) is computed without employing the partial wave expansion. This is compared with the results obtained using the conventional method of partial wave expansion. Through a comprehensive survey over a range of screening mass and center-of-mass energy, which, when combined, determine the orbital angular momentum involved in the scattering through the associated …

Rotating Kinetic Gas Disk Morphology Surrounding a Schwarzschild Black Hole
Carlos Gabarrete, Roger Raudales
https://arxiv.org/abs/2508.14863 https://arxiv…

Rotating Kinetic Gas Disk Morphology Surrounding a Schwarzschild Black Hole
In this work, the behavior of a rotating relativistic kinetic gas surrounding a Schwarzschild black hole is studied. We are interested in the description and the analysis of the morphology of the resulting configurations for a kinetic gas cloud with and without total angular momentum, and we also compare the macroscopic observables with configurations of finite total mass. A collisionless gas in the Schwarzschild spacetime background is analyzed, considering models of the one-particle distribut…

Unveiling orbital optical chirality through multipolar chiral light-matter interaction
Shun Hashiyada, An'an Wu, Yoshito Y. Tanaka
https://arxiv.org/abs/2508.08902 https://

Unveiling orbital optical chirality through multipolar chiral light-matter interaction
Chiral light-matter interactions have traditionally been understood in terms of electric-magnetic dipolar interference driven by light with spin angular momentum. Here, we show that optical chirality can also originate from the orbital angular momentum (OAM) of light, giving rise to higher-order multipolar chiral responses. Using a twisted gold nanorod dimer and tightly focused circularly polarized optical vortex beams carrying spin and orbital angular momenta of the same sign, we measure spect…

Theory of magnon hydrodynamics in collinear antiferromagnets
Vivianne Olgu\'in-Arias, Alireza Qaiumzadeh, Roberto E. Troncoso
https://arxiv.org/abs/2508.05057 https://

Theory of magnon hydrodynamics in collinear antiferromagnets
We investigate the transport of spin angular momentum and linear momentum carried by magnons in electrically insulating collinear antiferromagnets (AFs). Focusing on both transverse and longitudinal geometries, we model magnons as a viscous fluid and explore the hydrodynamic transport regime that emerges when the magnon-magnon scattering length is shorter than the momentum-relaxation length, such that momentum-conserving processes dominate over momentum-relaxing ones. We develop a theoretical f…

Rotation Periods of Candidate Single Late-M Dwarfs in TESS
Samantha Lambier, Stanimir Metchev, Paulo Miles-P\'aez, Leslie Moranta, Dakota Wolfe, Joelene Hales, Jeffrey Martinovic
https://arxiv.org/abs/2507.10847

Rotation Periods of Candidate Single Late-M Dwarfs in TESS
Recent studies suggest that the angular momentum evolution of late-M and brown dwarfs differs from the well-known spin-down evolution of hotter stars. Characterizing the distribution of rotation periods of these objects in the solar neighborhood can help elucidate this evolutionary pathway just above, at, and below the hydrogen burning limit. In this paper, we examine 399 candidate single late-M dwarfs with $G - G_{RP} \geq 1.4$ mag ($\gtrsim$M6) using TESS light curves. To determine rotation p…

Spin-Orbit Structure and Helicity Anomaly in Relativistic Electron Vortex Beams
Zhongze Guo, Bei Xu, Qiang Gu
https://arxiv.org/abs/2507.08493 https://

Spin-Orbit Structure and Helicity Anomaly in Relativistic Electron Vortex Beams
The relativistic electron vortex beam (REVB) has attracted increasing attention due to its nontrivial spin-orbit structure recently. As relativistic electrons are governed by the Dirac equation, exact solutions to this equation provide the most reliable starting point for understanding angular momentum characteristics of REVBs. In this work, a set of exact eigensolutions of the Dirac equation are derived in a complex cylindrical coordinate system using a generalized series expansion method. We …

Propagation of Precessing Jet in Envelope of Tidal Disruption Events
Hao-Yu Yuan, Hong-Zhou Wu, Wei-Hua Lei
https://arxiv.org/abs/2508.11578 https://arxiv.…

Propagation of Precessing Jet in Envelope of Tidal Disruption Events
It is likely that the disk of a tidal disruption event (TDE) is misaligned with respect to the equatorial plane of the spinning supermassive black hole (SMBH), since the initial stellar orbit before disruption is most likely has an inclined orbital plane. Such misaligned disk undergoes Lense-Thirring precession around the SMBH spin axis, leading to a precessing jet if launched in the vicinity of the SMBH and aligned with the disk angular momentum. The bound debris can also build a thick envelop…

Direct Measurement of the Accretion Disk Formed in Prompt Collapse Mergers with Future Gravitational-Wave Observatories
Arnab Dhani, Alessandro Camilletti, Alessio Ludovico De Santis, Andrea Cozzumbo, David Radice, Domenico Logoteta, Albino Perego, Jan Harms, Marica Branchesi
https://arxiv.org/abs/2507.14071

Direct Measurement of the Accretion Disk Formed in Prompt Collapse Mergers with Future Gravitational-Wave Observatories
The production site of heavy r-process elements, such as Gold and Uranium, is uncertain. Neutron star mergers are the only astrophysical phenomenon in which we have witnessed their formation. However, the amount of heavy elements resulting from the merger remains poorly constrained, mainly due to uncertainties on the mass and angular momentum of the disk formed in the merger remnant. Matter accretion from the disk is also thought to power gamma ray-bursts. We discover from numerical relativity …

Unexpected Symmetries of Kerr Black Hole Scattering
Dogan Akpinar, Graham R. Brown, Riccardo Gonzo, Mao Zeng
https://arxiv.org/abs/2508.10761 https://arxiv…

Unexpected Symmetries of Kerr Black Hole Scattering
Motivated by the recent introduction of the Dirac bracket framework to compute spinning observables for the scattering of Kerr black holes, we initiate the study of conserved quantities from an on-shell amplitude perspective. We establish new results for the conservation of energy, angular momentum, the Rüdiger invariant and the quadrupolar Carter constant using the spinning radial action extracted from the literature both in the probe limit and beyond, up to third post-Minkowskian order in th…

Generation of ultra-intense spatiotemporal optical vortex
Renjing Chen, Yilin Xu, Fengyu Sun, Shunlin Huang, Xiong Shen, Wenpeng Wang, Jun Liu, Ruxin Li
https://arxiv.org/abs/2508.14452

Generation of ultra-intense spatiotemporal optical vortex
Spatiotemporal optical vortex (STOV) with transverse orbital angular momentum (TOAM) can induce some novel properties in high energy density physics. However, the current STOV pulse energy is limited to the mJ level, which greatly hinders the development of the research field of relativistic laser-matter interaction. Combined with the large-scale grating pair in high-peak-power laser facility, the method for generating of STOV with ultra-high intensity up to 1021 W/cm2 is proposed. The numerica…

Microscopic theory of angular momentum distributions across the full range of fission fragments
Petar Marevi\'c, Nicolas Schunck, Marc Verriere
https://arxiv.org/abs/2506.10777

Microscopic theory of angular momentum distributions across the full range of fission fragments
Modern nuclear theory provides qualitative insights into the fundamental mechanisms of nuclear fission and is increasingly capable of making reliable quantitative predictions. Most quantities of interest pertain to the primary fission fragments, whose subsequent decay is typically modeled using statistical reaction models. Consequently, a key objective of fission theory is to inform these models by predicting the initial conditions of the primary fragments. In this work, we employ a framework t…

Geometry-Driven Lattice of Photonic Spin-Meron Tubes in Free Space
Anand Hegde, Komal Gupta, Yanan Dai, Chen-Bin Huang
https://arxiv.org/abs/2508.14450 https://

Geometry-Driven Lattice of Photonic Spin-Meron Tubes in Free Space
We theoretically demonstrate the first photonic spin-meron tube lattice in free space using spin-angular momentum vectors. Square-block diffraction creates $C_{4}$-symmetric beams with $π/2$ phase steps. Non-paraxial spin-orbit coupling then forms finite-length meron tubes ($N_{\mathrm{sk}} \approx \pm 1/2$, $> 25,λ$). Extending the formalism, we show that $C_{3}$ geometry of a triangular block yields a spin-skyrmion tube. Stratton-Chu theory and full-vectorial finite-difference time-domain c…

Rotational susceptibility of a hot and dense hadronic matter: A possible probe of QCD phase transition
Bhagyarathi Sahoo, Kshitish Kumar Pradhan, Dushmanta Sahu, Raghunath Sahoo
https://arxiv.org/abs/2507.03708

Rotational susceptibility of a hot and dense hadronic matter: A possible probe of QCD phase transition
We study the effect of rotation and the consequent angular momentum fluctuations in a hadron resonance gas produced in ultra-relativistic heavy ion collisions. The rotational susceptibilities ($χ_{\rm ω}$, $χ^{2}_{\rm ω}$, etc.), which quantify how much the system responds to a small angular velocity, are estimated for the first time, considering that these can be valuable indicators of the QCD phase transition. The higher-order rotational susceptibilities and their ratios are estimated in …

This https://arxiv.org/abs/2501.07198 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hept…

Large charge operators at large spin from relativistically rotating vortices
We study the ground states of CFTs with a global $U(1)$ symmetry on $\mathbb{R}\times S^2$ in the regime of large charge $Q$ and large angular momentum $J$, using large charge EFT. We find that in the range $Q \ll J \ll Q^2$, the ground state solution is a superfluid densely populated with vortices rotating at a constant angular velocity $Ω$. This is a relativistic generalization of the known (non-relativistic) rigid rotation phase, which corresponds to the small $Ω$ limit of our solution. In…

Chiral Phonons in Graphyne
Subhendu Mishra, Arpan Chakraborty, Douglas S. Galvao, Pedro A. S. Autreto, Abhishek Kumar Singh
https://arxiv.org/abs/2508.11040 https://

Chiral Phonons in Graphyne
Chiral phonons, quantized lattice vibrations with circular polarization and non-zero angular momentum, offer new perspectives for phononic and quantum device engineering. Graphyne could be a promising candidate due to its unique lattice geometry, valley-structured electronic bands, and thermal transport capabilities. However, chiral phonons in graphyne remain unexplored owing to the existence of inversion ($\mathscr{P}$) and time-reversal ($\mathscr{T}$) symmetries. Herein, we have demonstrated…

Optical Vortex Spin-Orbit Control of Refractive Index in Iron Garnets
Seth Nelson, Cong Yu, Daniel Watson, Shahrzad Ramtinfard, Miguel Levy
https://arxiv.org/abs/2507.02093

Optical Vortex Spin-Orbit Control of Refractive Index in Iron Garnets
The interaction between light's angular momentum (AM) and material systems has unlocked new avenues in structured photonics, including in magneto-optical (MO) materials. While spin angular momentum (SAM) effects in MO systems are well-established, orbital angular momentum (OAM) introduces novel opportunities for new nonreciprocal light-matter interactions. In this study, we demonstrate a unique optical phenomenon where OAM states undergo state-specific nonreciprocal operation within an MO mediu…

Multipolar transitions excited by twisted photons in heavy quarkonia
P. S. Korolev, V. A. Ryakin
https://arxiv.org/abs/2508.09877 https://arxiv.org/pdf/250…

Multipolar transitions excited by twisted photons in heavy quarkonia
In this study, we investigate the excitation of multipole transitions in quarkonium systems by high-energy photons carrying orbital angular momentum. We derive explicit expressions for the amplitude and probability of photoexcitation incorporating the dynamics of the quarkonium center of mass. It is shown that the leading contribution to the transitions induced by twisted photons comes from the multipole $j=|m_γ|$ and $m_γ=l'-l$ in the long-wave approximation. Despite the fact that …

The R-index: A universal metric for evaluating OAM content and mode purity in optical fields
Monika Bahl, Georgios M. Koutentakis, Mikhail Maslov, Tom Jungnickel, Timo Gassen, Mikhail Lemeshko, Oliver H. Heckl
https://arxiv.org/abs/2508.12973

The R-index: A universal metric for evaluating OAM content and mode purity in optical fields
Despite its pivotal role in optical manipulation, high-capacity communications, and quantum information, a general measure of orbital angular momentum (OAM) in structured light remains elusive. In optical fields, where multiple vortices coexist, the local nature of vortex OAM and the absence of a common rotation axis make the total OAM of the field difficult to quantify. Here, we introduce the R-index, a metric that captures the intrinsic OAM content of any structured optical field, from pure L…

Rotational Properties of Superradiant Condensates
Yin-da Guo, Kai-Dong Zhou, Shou-Shan Bao, Hong Zhang
https://arxiv.org/abs/2508.09567 https://arxiv.org/p…

Rotational Properties of Superradiant Condensates
Superradiance enables scalar fields to extract energy and angular momentum from a rotating black hole (BH), leading to the formation of a BH-condensate system. The condensate appears to exhibit global rotation as a rigid body, with phase propagation occurring only in the azimuthal direction, such a picture leads to unphysical superluminal velocities at large distances. In this work, we demonstrate that the apparent rotation is a collective effect arising from local radial, polar, and azimuthal …

Vortex Light at the Nanoscale: Twists, Spins, and Surprises -- A Review
Kayn A Forbes
https://arxiv.org/abs/2508.09564 https://arxiv.org/pdf/2508.09564

Vortex Light at the Nanoscale: Twists, Spins, and Surprises -- A Review
For over three decades, the study of optical vortex beams carrying orbital angular momentum (OAM) has been at the forefront of optics, driven by fundamental questions about optical momentum as well as diverse applications in quantum information, communications, and optical manipulation. Most work has focused on paraxial beams, whose transverse fields are accurately described by conventional wave optics and the Stokes formalism. By contrast, when light is confined to the nanoscale and tightly fo…