Tootfinder

Scaling of the rotation number for perturbations of rational rotations
Paul Glendinning
https://arxiv.org/abs/2506.19508 https://arxi…

Scaling of the rotation number for perturbations of rational rotations
The parameter dependence of the rotation number in families of circle maps which are perturbations of rational rotations is described. We show that if, at a critical parameter value, the map is a (rigid) rotation $x\to x+\frac{p}{q}~({\rm mod}~1)$ with $p$ and $q$ coprime, then the rotation number is differentiable at that point provided a transversality condition holds, and hence that the rotation number scales linearly at this parameter. We provide an explicit and computable expression for th…

Mixed virtual element methods for a stress-velocity-rotation formulation in viscoelasticity
Sarvesh Kumar, Utkarsh Rajput, Ricardo Ruiz-Baier
https://arxiv.org/abs/2506.18168

Mixed virtual element methods for a stress-velocity-rotation formulation in viscoelasticity
In this paper we propose a new mixed virtual element formulation for the numerical approximation of viscoelasticity equations with weakly imposed stress symmetry. The governing equations use the Zener model and are expressed in terms of the principal unknowns of additively decomposed stress into elastic and internal viscoelastic contributions, while the rotation tensor and velocity act as Lagrange multipliers. The time discretisation uses Crank--Nicolson's scheme. We demonstrate the unique solv…

The Relationship of Stellar Radius Inflation to Rotation and Magnetic Starspots at 10--670 Myr
Lyra Cao, Keivan G. Stassun
https://arxiv.org/abs/2506.18972

The Relationship of Stellar Radius Inflation to Rotation and Magnetic Starspots at 10--670 Myr
Active, low-mass stars are widely observed to have radii that are larger than predicted by standard stellar models. Proposed mechanisms for this radius inflation generally involve stellar magnetism, either in the form of added pressure support in the outer layers and/or suppression of convection via starspots. We have assembled a large sample of 261 low-mass stars in the young clusters Upper Scorpius, $α$ Persei, Pleiades, and Praesepe (spanning ages 10--670 Myr) for which the data exist to em…

Webification of symmetry classes of plane partitions
Ashleigh Adams, Jessica Striker
https://arxiv.org/abs/2508.16565 https://arxiv.org/pdf/2508.16565

Webification of symmetry classes of plane partitions
Webs are graphical objects that give a tangible, combinatorial way to compute and classify tensor invariants. Recently, [Gaetz, Pechenik, Pfannerer, Striker, Swanson 2023+] found a rotation-invariant web basis for $\mathrm{SL}_4$, as well as its quantum deformation $U_q(\mathfrak{sl}_4)$, and a bijection between move equivalence classes of $U_q(\mathfrak{sl}_4)$-webs and fluctuating tableaux such that web rotation corresponds to tableau promotion. They also found a bijection between the set of …

Fundamental generalized Legendrian rack and classical invariants
Zhiyun Cheng, Zhiyi He
https://arxiv.org/abs/2507.18500 https://arxiv.org/pdf/2507.18500…

Fundamental generalized Legendrian rack and classical invariants
In this paper, we prove that if two Legendrian knots have isomorphic fundamental GL-racks, then either they have the same Thurston-Bennequin number and the same rotation number, or they have the opposite Thurston-Bennequin numbers and opposite rotation numbers.

Generalized Code Distance through Rotated Logical States in Quantum Error Correction
Valentine Nyirahafashimana, Nurisya Mohd Shah, Umair Abdul Halim, Mohamed Othman
https://arxiv.org/abs/2506.17062

Generalized Code Distance through Rotated Logical States in Quantum Error Correction
We construct rotated logical states by applying rotation operators to stabilizer states, extending the logical basis and modifying stabilizer generators. Rotation operators affect the effective code distance $d_R$, which decays exponentially with rotation angles $(θ, ϕ)$, influencing error correction performance. We quantify the scaling behavior of logical error rates under circuit-level noise, comparing standard depolarizing (SD) and superconducting-inspired (SI) noise models with small and …

Solar Cycle Variations in Meridional Flows and Rotational Shear within the Sun's Near-surface Shear Layer: #solar rotation: https://www.nature.com/articles/d44151-025-00101-6 - scientists uncover how deep plasma flows reshape the Sun’s rotation and hint at mysteries below its surface.

Characterizing and Recognizing Twistedness
Oswin Aichholzer, Alfredo Garc\'ia, Javier Tejel, Birgit Vogtenhuber, Alexandra Weinberger
https://arxiv.org/abs/2508.16178 https:…

Characterizing and Recognizing Twistedness
In a simple drawing of a graph, any two edges intersect in at most one point (either a common endpoint or a proper crossing). A simple drawing is generalized twisted if it fulfills certain rather specific constraints on how the edges are drawn. An abstract rotation system of a graph assigns to each vertex a cyclic order of its incident edges. A realizable rotation system is one that admits a simple drawing such that at each vertex, the edges emanate in that cyclic order, and a generalized twist…

I had kind of forgotten what a joyous, chaotic and rich experience this TMBG album is. While Apollo 18 still remains my fave, this one deserves more rotation than I give it. I know it’s heretical, but I love the sound of the Johns with a full backing band.
https://music.apple.com/us/album/30095

🌮 Corn after soy: New study quantifies rotation benefits and trade-offs
#corn

Corn after soy: New study quantifies rotation benefits and trade-offs
While the majority of Midwestern farmers rotate corn and soybeans, commodity prices and corn yield advantages compel some to plant corn year after year. Although foundational research on the benefits of corn-soybean rotation goes back decades, University of Illinois Urbana-Champaign scientists are working to address remaining holistic questions about crop yield, environmental impacts, and economic returns under various crop rotation scenarios.

Development of a Chip-Scale Optical Gyroscope with Weak Measurement Amplification Readout
Kagan Yanik, Meiting Song, Yuhan Mei, Jaime Cardenas, Andrew N. Jordan
https://arxiv.org/abs/2507.17034

Development of a Chip-Scale Optical Gyroscope with Weak Measurement Amplification Readout
The design of an integrated optical chip is proposed containing a rotation sensing ring resonator (optical gyroscope) coupled to an inverse weak value amplified Sagnac interferometer that amplifies the signal containing the phase information. We show that, for conservative parameter choices, our setup has a minimum detectable angular rotation rate of 0.1 deg/hr and an Allan deviation of 0.08 deg/hr under expected ideal conditions. We also show that for an appropriate amount of input power, our …

Linearithmic Clean-up for Vector-Symbolic Key-Value Memory with Kroneker Rotation Products
Ruipeng Liu, Qinru Qiu, Simon Khan, Garrett E. Katz
https://arxiv.org/abs/2506.15793

Linearithmic Clean-up for Vector-Symbolic Key-Value Memory with Kroneker Rotation Products
A computational bottleneck in current Vector-Symbolic Architectures (VSAs) is the ``clean-up'' step, which decodes the noisy vectors retrieved from the architecture. Clean-up typically compares noisy vectors against a ``codebook'' of prototype vectors, incurring computational complexity that is quadratic or similar. We present a new codebook representation that supports efficient clean-up, based on Kroneker products of rotation-like matrices. The resulting clean-up time complexity is linearithm…

The Galactic Bulge exploration V.: The secular spherical and X-shaped Milky Way bulge
Z. Prudil, V. P. Debattista, L. Beraldo e Silva, S. R. Anderson, S. Gough-Kelly, A. Kunder, M. Rejkuba, O. Gerhard, R. F. G. Wyse, A. J. Koch-Hansen, R. M. Rich, A. Savino
https://arxiv.org/abs/2506.19074…

The Galactic Bulge exploration V.: The secular spherical and X-shaped Milky Way bulge
In this work, we derive systemic velocities and subsequently orbits for 8456 RR~Lyrae stars. We identify interlopers from other Milky Way (MW) structures, which amount to 22 percent of the total sample. Most interlopers are associated with the halo, with the remainder linked to the Galactic disk. We confirm the previously reported lag in the rotation curve of bulge RR~Lyrae stars regardless of the removal of interlopers. Metal-rich RR~Lyrae stars' rotation patterns are consistent with that of n…

Magnon topology driven by altermagnetism
Subhankar Khatua, Volodymyr P. Kravchuk, Kostiantyn V. Yershov, Jeroen van den Brink
https://arxiv.org/abs/2507.17822 https://

Magnon topology driven by altermagnetism
Altermagnets present a new class of fully compensated collinear magnetic order, where the two sublattices are not related merely by time-reversal combined with lattice translation or inversion, but require an additional lattice rotation. This distinctive symmetry leads to a characteristic splitting of the magnon bands; however the splitting is only partial -- residual degeneracies persist along certain lines in the Brillouin zone as a consequence of the underlying altermagnetic rotation. We con…

Electromagnetic and Centrifugal Effects on Plasma Acceleration in the Magnetic Nozzle
A. I. Smolyakov, A. Sabo, S. I. Krasheninnikov, P. N. Yushmanov
https://arxiv.org/abs/2506.19647

Electromagnetic and Centrifugal Effects on Plasma Acceleration in the Magnetic Nozzle
Plasma flow and acceleration in the converging-diverging magnetic field configuration, such as magnetic nozzle in electric propulsion and open magnetic mirrors for fusion applications are considered. This work analyses plasma acceleration in the magnetic nozzle with an emphasis on the electromagnetic effects and centrifugal forces due to plasma rotation. Intrinsic coupling of the azimuthal rotation and azimuthal magnetic field is analyzed, and additional plasma acceleration due to the conversio…

Improvement on LiDAR-Camera Calibration Using Square Targets
Zhongyuan Li, Honggang Gou, Ping Li, Jiaotong Guo, Mao Ye
https://arxiv.org/abs/2506.18294 htt…

Improvement on LiDAR-Camera Calibration Using Square Targets
Precise sensor calibration is critical for autonomous vehicles as a prerequisite for perception algorithms to function properly. Rotation error of one degree can translate to position error of meters in target object detection at large distance, leading to improper reaction of the system or even safety related issues. Many methods for multi-sensor calibration have been proposed. However, there are very few work that comprehensively consider the challenges of the calibration procedure when appli…

Fast globally optimal Truncated Least Squares point cloud registration with fixed rotation axis
Ivo Ivanov, Carsten Markgraf
https://arxiv.org/abs/2508.15613 https://

Fast globally optimal Truncated Least Squares point cloud registration with fixed rotation axis
Recent results showed that point cloud registration with given correspondences can be made robust to outlier rates of up to 95\% using the truncated least squares (TLS) formulation. However, solving this combinatorial optimization problem to global optimality is challenging. Provably globally optimal approaches using semidefinite programming (SDP) relaxations take hundreds of seconds for 100 points. In this paper, we propose a novel linear time convex relaxation as well as a contractor method t…

An alternative interpretation of the Grioli gyroscope suspension points
Alexei A. Deriglazov
https://arxiv.org/abs/2506.19819 https://

An alternative interpretation of the Grioli gyroscope suspension points
We present a detailed analysis of all possible regular precessions of a heavy asymmetric body with a fixed point not coinciding with the center of mass. The calculations are done in terms of the rotation matrix, by writing the Euler-Poisson equations with all involved vectors parameterized in the Laboratory frame. It is shown that a regular precession is possible if the suspension point is chosen on the straight lines (lying in the principal plane) which are frontiers of the regions where, as t…

Multi-Angle Rotational Actuation in a 0.8-mm-Thick Preload-Free Piezoelectric Micromotor
Haijia Yu, Mingtong Chen, Zhengbao Yang
https://arxiv.org/abs/2507.17155 https://…

Multi-Angle Rotational Actuation in a 0.8-mm-Thick Preload-Free Piezoelectric Micromotor
Micro motors can be used in numerous fields like Micro medical testing and treatment. To achieve a smaller size, micro piezoelectric motors in laboratories often omit the outer casing, which can lead to functional defects such as rotation only in one fixed direction or the need for external weights (which are not counted within the motors volume) to increase preload. However, this significantly reduces the practical value of micro piezoelectric motors. This paper proposes a new driving principl…

Towards Modelling AR Sco: Calibration -- Reproducing High-Energy Pulsar Emission and Testing Convergence to Aristotelian Electrodynamics
Louis Du Plessis, Christo Venter, Alice K. Harding, Zorawar Wadiasingh, Constantinos Kalapotharakos
https://arxiv.org/abs/2506.18917

Towards Modelling AR Sco: Calibration -- Reproducing High-Energy Pulsar Emission and Testing Convergence to Aristotelian Electrodynamics
In recent years, kinetic simulations have been crucial to further our understanding of pulsar electrodynamics. Yet, due to the large-scale separation between the gyro-period vs the stellar rotation period, resolving the particle gyration has been computationally unfeasible for realistic pulsar parameters. The main aim of this work is comparing our gyro-phase-resolved model with a gyro-centric pulsar model, where our model solves the general equations of motion with included radiation reaction u…

Two dimensional Coulomb gas in a non-conservative trap
David S. Dean, Rashed Aljasmi, Satya N. Majumdar
https://arxiv.org/abs/2506.18551 https://

Two dimensional Coulomb gas in a non-conservative trap
We study the nonequilibrium steady state of a two dimensional Coulomb gas under the action of an anisotropic harmonic trapping potential along with a non-conservative rotational force. In the case without rotation, the equilibrium (zero temperature) steady state has a uniform density supported over a a static elliptical droplet. The addition of a rotational force drives the system into a nonequilibrium steady state where the density is still uniform inside an ellipse, but the ellipse gets tilte…

Wiener Hopf Analysis of Transient Mode-I/Mode-II Fracture in Rotating Heterogeneous Magnetoelastic Orthotropic Media under Initial Stresses
Diksha, Soniya Chaudhary, Pawan Kumar Sharma
https://arxiv.org/abs/2508.15870

Wiener Hopf Analysis of Transient Mode-I/Mode-II Fracture in Rotating Heterogeneous Magnetoelastic Orthotropic Media under Initial Stresses
This study investigates the fracture behavior under both opening (Mode I) and in-plane sliding (Mode II) conditions for a semi-infinite crack in a rotating, spatially graded magnetoelastic orthotropic strip with combined horizontal and vertical initial normal stresses. The strip is assumed infinite in extent, with the crack aligned along its longitudinal axis and parallel to the rotation axis. The governing field equations are reduced to an analytically tractable form by employing the Fourier t…

Simulation of Flagellated Bacteria Near a Solid Surface: Effects of Flagellar Morphology and Ionic Strength
Baopi Liu, Bowen Jin, Ning An
https://arxiv.org/abs/2506.19271

Simulation of Flagellated Bacteria Near a Solid Surface: Effects of Flagellar Morphology and Ionic Strength
This study systematically investigates the dynamics of the bacterial transition from free-swimming to surface adhesion, a process characterized by both height $h$ and inclination angle $Ψ$. The surface entrapment process is divided into three main stages. Initially, bacteria swim towards the surface at an approach velocity proportional to the motor rotation frequency. Subsequently, during the reorientation stage, the cotangent of the inclination angle decays exponentially with the product of t…

Inclination Effect on Observational Identification of Outflow Rotation in Magnetohydrodynamics Simulations
Yusuke Aso, Masahiro N. Machida
https://arxiv.org/abs/2507.15535

Inclination Effect on Observational Identification of Outflow Rotation in Magnetohydrodynamics Simulations
We investigate the observational signatures of outflow rotation in protostellar systems using magnetohydrodynamics simulations of protostellar evolution with radiative transfer and synthetic observation. The velocity gradient perpendicular to the outflow axis indicates outflow rotation. The rotation signature is clearly seen in the moment 1 map and a position-velocity (PV) diagram across an outflow lobe made from our model with an inclination angle of i>~85{degree sign}, as in observational stu…

Chargers' Greg Roman expects RB rotation: One-back offense has gone way of 'prehistoric creatures' https://www.nfl.com/news/chargers-greg-roman-rb-rotation-prehistoric-creatures-najee-harris-omarion-hampton

A Kaleidoscope of Topological Structures in Dipolar Bose-Einstein Condensates with Weyl-Like Spin-Orbit Coupling in Anharmonic Trap
Yun Liu, Zu-Jian Ying
https://arxiv.org/abs/2506.16734

A Kaleidoscope of Topological Structures in Dipolar Bose-Einstein Condensates with Weyl-Like Spin-Orbit Coupling in Anharmonic Trap
Dipole-dipole interaction (DDI) possesses characteristics different from the conventional isotropic s-wave interaction in Bose-Einstein condensates (BECs), the interplay of DDI with spin-orbit coupling (SOC) and rotation may induce novel quantum properties. We systematically analyze the effects of the DDI, Weyl-like SOC, rotation and trap anharmonicity in the ground state of two-componen BECs. The interplay of these factors leads to a kaleidoscope of quantum states of quantum defects and quantu…

Cowboys veteran RBs split early first-team reps, with one having slight edge https://www.si.com/nfl/cowboys/news/dallas-cowboys-veteran-rbs-split-early-first-team-reps-one-slight-edge

Becoming Green: Decomposing the Macroeconomic Effects of Green Technology News Shocks
Oscar Jaulin, Andrey Ramos
https://arxiv.org/abs/2507.18386 https://a…

Becoming Green: Decomposing the Macroeconomic Effects of Green Technology News Shocks
This paper studies the macroeconomic effects of news about future technological advancements in the green sector. Utilizing the economic value of green patents granted to publicly listed companies in the U.S., we identify green technology news shocks via a convenient and meaningful rotation of the innovations from a Bayesian Vector Autorregresion Model (BVAR). These shocks are decomposed into two orthogonal components: i) a common technological component shared by both green and non-green innov…

The magnetic and spin-down properties of slowly rotating fully convective M dwarfs
Victor See, Louis Amard, Stefano Bellotti, Sudeshna Boro Saikia, Emma L. Brown, Jean-Francois Donati, Rim Fares, Adam J. Finley, Colin P. Folsom, \'Elodie M. H\'ebrard, Moira M. Jardine, Sandra V. Jeffers, Baptiste Klein, Lisa T. Lehmann, Stephen C. Marsden, Sean P. Matt, Matthew W. Mengel, Julien Morin, Pascal Petit, Katelyn Smith, Aline A. Vidotto, Ian A. Waite

The magnetic and spin-down properties of slowly rotating fully convective M dwarfs
The evolution of the magnetism, winds and rotation of low-mass stars are all linked. One of the most common ways to probe the magnetic properties of low-mass stars is with the Zeeman-Doppler imaging (ZDI) technique. The magnetic properties of partially convective stars has been relatively well explored with the ZDI technique, but the same is not true of fully convective stars. In this work, we analyse a sample of stars that have been mapped with ZDI. Notably, this sample contains a number of sl…

New Upper Bounds on Exotic Neutron Spin-Electron Spin Interactions via Neutron Spin Rotation Measurements in a Compensated Ferrimagnet
T. Mulkey, K. N. Lopez, C. D. Hughes, B. Hill, M. Van Meter, H. Wijeratne, J. C. Long, M. Sarsour, W. M. Snow, K. Li, R. Parajuli, S. Samiei, D. V. Baxter, M. Luxnat, Y. Zhang, C. Jiang, E. Stringfellow, J. Torres, R. Hobbs
http…

New Upper Bounds on Exotic Neutron Spin-Electron Spin Interactions via Neutron Spin Rotation Measurements in a Compensated Ferrimagnet
We report a search for exotic spin-spin interactions between neutrons and electrons which could signal new physics beyond the Standard Model using slow neutron polarimetric imaging through a dense medium of polarized electrons. Our dense polarized electron target is a ferrimagnet held at its magnetic compensation temperature, which realizes a polarized electron ensemble with zero net magnetization. We sought the spin rotation of transversely polarized neutrons from a neutron spin-electron spin …

Dislocations and crystallization dynamics of chiral soliton lattices
Minoru Eto, Kentaro Nishimura, Muneto Nitta
https://arxiv.org/abs/2506.16354 https://

Dislocations and crystallization dynamics of chiral soliton lattices
Dislocations, as topological defects in crystal lattices, are fundamental to understanding plasticity in materials. Similar periodic structures also arise in continuum field theories, such as chiral soliton lattices (CSLs), which appear in condensed matter systems like chiral magnets and in high-energy contexts such as quantum chromodynamics in strong magnetic field or under rapid rotation. This work investigates whether dislocations can dynamically form within such emergent CSLs. The chiral si…

Planck constraints on the scale dependence of isotropic cosmic birefringence
M. Ballardini, A. Gruppuso, S. Paradiso, S. S. Sirletti, P. Natoli
https://arxiv.org/abs/2507.16714

Planck constraints on the scale dependence of isotropic cosmic birefringence
The rotation of the linear polarisation plane of photons during propagation, also known as cosmic birefringence, is a powerful probe of parity-violating extensions of standard electromagnetism. Using Planck legacy data, we confirm previous estimates of the isotropic birefringence angle, finding $β\simeq 0.30 \pm 0.05$ [deg] at 68% CL, not including the systematic error from the instrumental polarisation angle. If this is a genuine signal, it could be explained by theories of Chern--Simons-type…

Gravitational lensing observables in stationary and axisymmetric solutions in general relativity
Matteo Luca Ruggiero, Davide Astesiano
https://arxiv.org/abs/2506.17192

Gravitational lensing observables in stationary and axisymmetric solutions in general relativity
We investigate light propagation in self-gravitating systems composed of an axially symmetric, stationary, rotating dust fluid. These configurations are intrinsically relativistic, sustained entirely by their rotation, since no compact or finite dust distribution can exist under the same symmetry conditions in Newtonian gravity. In such systems, rotational effects arise from off-diagonal components of the spacetime metric, which are not negligible compared to their Newtonian counterparts. We an…

Spinning into the Gap: Direct-Horizon Collapse as the Origin of GW231123 from End-to-End GRMHD Simulations
Ore Gottlieb, Brian D. Metzger, Danat Issa, Sean E. Li, Mathieu Renzo, Maximiliano Isi
https://arxiv.org/abs/2508.15887

Spinning into the Gap: Direct-Horizon Collapse as the Origin of GW231123 from End-to-End GRMHD Simulations
GW231123, the most massive binary black hole (BH) merger observed to date, involves component BHs with masses inside the pair-instability mass gap and unusually high spins. This challenges standard formation channels such as classical stellar evolution and hierarchical mergers. However, stellar rotation and magnetic fields, which have not been systematically incorporated in prior models, can strongly influence the BH properties. We present the first self-consistent simulations tracking a massiv…

Mental rotation is a weak measure of people's propensity to visualise https://www.sciencedirect.com/science/article/pii/S105381002500100X mental imagery

Assessing robustness and bias in 1D retrievals of 3D Global Circulation Models at high spectral resolution: a WASP-76 b simulation case study in emission
Lennart van Sluijs, Hayley Beltz, Isaac Malsky, Genevieve H. Pereira, L. Cinque, Emily Rauscher, Jayne Birkby
https://arxiv.org/abs/2507.16687

Assessing robustness and bias in 1D retrievals of 3D Global Circulation Models at high spectral resolution: a WASP-76 b simulation case study in emission
High-resolution spectroscopy (HRS) of exoplanet atmospheres has successfully detected many chemical species and is quickly moving toward detailed characterization of the chemical abundances and dynamics. HRS is highly sensitive to the line shape and position, thus, it can detect three-dimensional (3D) effects such as winds, rotation, and spatial variation of atmospheric conditions. At the same time, retrieval frameworks are increasingly deployed to constrain chemical abundances, pressure-temper…

Higher reflections and entropy of canonical shifts for inclusions of $C^*$-algebras with finite Watatani index
Keshab Chandra Bakshi, Satyajit Guin, Biplab Pal, Sruthymurali
https://arxiv.org/abs/2506.16130

Higher reflections and entropy of canonical shifts for inclusions of $C^*$-algebras with finite Watatani index
Given a unital inclusion of simple $C^*$-algebras equipped with a conditional expectation of index-finite type, we study higher Fourier transforms and rotation operators and introduce the reflection operators on the relative commutants. We prove that the reflections are unital, involutive, $*$-preserving anti-homomorphisms that preserve certain Markov-type traces. As an application, we prove Fourier theoretic inequalities on the higher relative commutants and improve the existing constant in th…

Electron acoustic shock and solitary waves in spin polarized dense rotating quantum plasmas
Atherv Saxena, Punit Kumar
https://arxiv.org/abs/2507.18228 https://

Electron acoustic shock and solitary waves in spin polarized dense rotating quantum plasmas
The propagation of electrostatic waves in a three-component electron positron ion astrophysical quantum plasma under the influence of uniform rotation is analysed, incorporating the effects of particle spin, Fermi pressure, and the quantum Bohm potential. Spin polarisation arising due to the alignment of particle spins under the influence of a strong external magnetic field leads to an imbalance in the population of spin-up and spin-down states. Additionally, key astrophysical factors such as r…

Discretized Rotation with fixed initial points
Shigeki Akiyama, Bill Mance
https://arxiv.org/abs/2507.12654 https://arxiv.org/pdf/250…

Discretized Rotation with fixed initial points
We prove that if $\max\{|a_0|,|a_1|\}\le 10$ and $λ\in\ ]-2,2[$, then the sequence defined by $$ 0 \le a_{n+2} +λa_{n+1}+a_n<1 $$ is periodic.

Earth's rotation is randomly speeding up,
and nobody is quite sure why.
These speedups, which have occurred several times over the last few years, haven't had any effect on daily life,
but they also haven't gone unnoticed by science.
Tuesday, Aug. 5 is the next date when Earth's rotation is expected to speed up, shortening the day by between 1.25 and 1.51 milliseconds. 
On Aug. 5, 2025, the moon will be quite a bit further south than the equato…

Earth Is Spinning Weirdly Faster, Making This Tuesday One of the Shortest Days Ever
The Earth will complete its daily rotation between 1.25 and 1.51 milliseconds faster than usual, and scientists aren't quite sure why.

Coupling of magnetic and lattice collective excitations in the 2D van der Waals antiferromagnet FePS$_{3}$
Kartik Panda, Itzik Kapon, Dumitru Dumcenco, Dirk van der Marel, Alexey Kuzmenko, Nimrod Bachar
https://arxiv.org/abs/2507.17238

Coupling of magnetic and lattice collective excitations in the 2D van der Waals antiferromagnet FePS$_{3}$
We report a comprehensive magneto-optical investigation of FePS$_3$ single crystals using temperature-dependent polarized transmission spectroscopy and Faraday rotation measurements. Our data reveal pronounced in-plane anisotropy in both phonon and magnon excitations, emerging distinctly below the Néel temperature ($T_N \approx 118$ K). A prominent magnon mode at 122 cm$^{-1}$ exhibits characteristic redshifting with increasing temperature and field-induced splitting, confirming its magnetic o…

Efficient Optimization of Low-Rank Antisymmetric Product of Geminals Wavefunction Using the Direct Givens Rotation Method
Airi Kawasaki, Rei Oshima, Naoki Nakatani, Hiromi Nakai
https://arxiv.org/abs/2508.11822

Efficient Optimization of Low-Rank Antisymmetric Product of Geminals Wavefunction Using the Direct Givens Rotation Method
In our previous study, we proposed the low-rank antisymmetric product of geminals (APG) method, which reconstructs the wavefunction by extracting only the important eigenvalues from the APG wave function. However, its practical application was limited by the high computational cost from an orbital optimization process, making higher-rank calculations difficult. In this work, we reformulate the orbital part of the wavefunction using Givens rotation matrices, enabling an analytical treatment of t…

Validate the bright Gaia celestial reference frame with new VLBI astrometry of radio stars
Jingdong Zhang, Bo Zhang, Shuangjing Xu, Xiaofeng Mai
https://arxiv.org/abs/2506.18758

Validate the bright Gaia celestial reference frame with new VLBI astrometry of radio stars
There exist inconsistencies between the bright and faint Gaia Celestial Reference Frame 3 (Gaia-CRF3), which manifests as a systematic rotation and needs to be independently estimated then corrected in future data releases. We collected 64 radio stars with VLBI astrometry, of which 16 have new VLBI observations with reference epochs close to Gaia. We estimated the orientation and spin biases of the bright Gaia-CRF3 by comparing VLBI radio star astrometry with their Gaia DR3 counterparts. We als…

How Does a Virtual Agent Decide Where to Look? - Symbolic Cognitive Reasoning for Embodied Head Rotation
Juyeong Hwang, Seong-Eun Hon, JaeYoung Seon, Hyeongyeop Kang
https://arxiv.org/abs/2508.08930

How Does a Virtual Agent Decide Where to Look? - Symbolic Cognitive Reasoning for Embodied Head Rotation
Natural head rotation is critical for believable embodied virtual agents, yet this micro-level behavior remains largely underexplored. While head-rotation prediction algorithms could, in principle, reproduce this behavior, they typically focus on visually salient stimuli and overlook the cognitive motives that guide head rotation. This yields agents that look at conspicuous objects while overlooking obstacles or task-relevant cues, diminishing realism in a virtual environment. We introduce SCOR…

RotBench: Evaluating Multimodal Large Language Models on Identifying Image Rotation
Tianyi Niu, Jaemin Cho, Elias Stengel-Eskin, Mohit Bansal
https://arxiv.org/abs/2508.13968 ht…

RotBench: Evaluating Multimodal Large Language Models on Identifying Image Rotation
We investigate to what extent Multimodal Large Language Models (MLLMs) can accurately identify the orientation of input images rotated 0°, 90°, 180°, and 270°. This task demands robust visual reasoning capabilities to detect rotational cues and contextualize spatial relationships within images, regardless of their orientation. To evaluate MLLMs on these abilities, we introduce RotBench -- a 350-image manually-filtered benchmark comprising lifestyle, portrait, and landscape images. Despite t…

DUN-SRE: Deep Unrolling Network with Spatiotemporal Rotation Equivariance for Dynamic MRI Reconstruction
Yuliang Zhu, Jing Cheng, Qi Xie, Zhuo-Xu Cui, Qingyong Zhu, Yuanyuan Liu, Xin Liu, Jianfeng Ren, Chengbo Wang, Dong Liang
https://arxiv.org/abs/2506.10309

DUN-SRE: Deep Unrolling Network with Spatiotemporal Rotation Equivariance for Dynamic MRI Reconstruction
Dynamic Magnetic Resonance Imaging (MRI) exhibits transformation symmetries, including spatial rotation symmetry within individual frames and temporal symmetry along the time dimension. Explicit incorporation of these symmetry priors in the reconstruction model can significantly improve image quality, especially under aggressive undersampling scenarios. Recently, Equivariant convolutional neural network (ECNN) has shown great promise in exploiting spatial symmetry priors. However, existing ECNN…

Learning Dexterous Object Handover
Daniel Frau-Alfaro, Julio Casta\~no-Amoros, Santiago Puente, Pablo Gil, Roberto Calandra
https://arxiv.org/abs/2506.16822

Learning Dexterous Object Handover
Object handover is an important skill that we use daily when interacting with other humans. To deploy robots in collaborative setting, like houses, being able to receive and handing over objects safely and efficiently becomes a crucial skill. In this work, we demonstrate the use of Reinforcement Learning (RL) for dexterous object handover between two multi-finger hands. Key to this task is the use of a novel reward function based on dual quaternions to minimize the rotation distance, which outp…

Replaced article(s) found for q-bio.QM. https://arxiv.org/list/q-bio.QM/new
[1/1]:
- Kinetic-Diffusion-Rotation Algorithm for Dose Estimation in Electron Beam Therapy
Klaas Willems, Vince Maes, Zhirui Tang, Giovanni Samaey

AMBER: Algorithm for Multiplexing spectrometer Background Estimation with Rotation-independence
Jakob Lass, Victor Cohen, Benjam\'in B\'ejar Haro, Daniel G. Mazzone
https://arxiv.org/abs/2507.11580

AMBER: Algorithm for Multiplexing spectrometer Background Estimation with Rotation-independence
State-of-the art neutron spectrometers enable simultaneous measurements of high-dimensional datasets, allowing for a large collection rate of dynamic material properties. In this paper, we present the Algorithm for Multiplexing spectrometer Background Estimation with Rotation-independence (AMBER), which is a segmentation algorithm designed to decompose measured neutron scattering data into model-agnostic foreground and background contributions. The method takes advantage of the fact that backgr…

Dissecting Bar-Induced Stellar Kinematics in Disk Galaxies: The Bisymmetric Model and Rotation Curve Modifications
Seungwon Baek, Woong-Tae Kim, Dajeong Jang, Taehyun Kim
https://arxiv.org/abs/2507.15204

Dissecting Bar-Induced Stellar Kinematics in Disk Galaxies: The Bisymmetric Model and Rotation Curve Modifications
We analyze bars formed in $N$-body simulations to investigate two key aspects of stellar kinematic structure of barred galaxies: the angular distributions of the radial and azimuthal components of stellar velocities, and the impact of bars on rotation curves. We find that stars on bar-supporting $x_1$-like orbits exhibit characteristic sawtooth-like radial velocity patterns and arch-like tangential velocity patterns as a function of azimuth. In contrast, stars on box and disk orbits show little…

Algorithmic methods of finite discrete structures. Topological graph drawing (part IV)
Sergey Kurapov, Maxim Davidovsky
https://arxiv.org/abs/2507.16759 ht…

Algorithmic methods of finite discrete structures. Topological graph drawing (part IV)
The chapter presents mathematical models intended for creating a topological drawing of a non-separable non-planar graph based on the methods of G. Ringel's vertex rotation theory. The induced system of cycles generates a topological drawing of a certain thickness. A method for determining the location of imaginary vertices by finding the intersection of connections on a plane is presented. A topological drawing of a maximum planar subgraph is used as a basis.

Spontaneous Rotation of a Symmetric Inclusion in Chiral Active Bath
Abhra Puitandy, Shradha Mishra
https://arxiv.org/abs/2507.12811 https://

Spontaneous Rotation of a Symmetric Inclusion in Chiral Active Bath
We study the dynamics of a circular passive inclusion, termed a torquer, in a bath of chiral active Brownian particles. Despite being geometrically symmetric and non-motile, the torquer exhibits persistent rotation due to spatially inhomogeneous torques arising from angularly biased collisions with active particles. This interaction-driven symmetry breaking does not rely on shape anisotropy or external forcing. Through simulations, we identify two distinct regimes of rotation: one dominated by …

Characterizing the Observational Properties of the Sun's High-latitude m=1 Inertial Mode
Boyang Ding, Junwei Zhao, Ruizhu Chen, Matthias Waidele, Sushant S. Mahajan, Oana Vesa
https://arxiv.org/abs/2506.19634

Characterizing the Observational Properties of the Sun's High-latitude m=1 Inertial Mode
Low-m inertial modes have been recently discovered in the Sun's high-latitude regions. In this study, we characterize the observational properties of the m = 1 mode by analyzing time-distance subsurface flow maps. Synoptic flow maps, constructed from daily subsurface flow maps using a tracking rate corresponding to the rotation at latitude 65 degrees, are filtered in both the spherical harmonic and Fourier domains to retain only the m = 1 mode and its dominant frequencies. Our analysis reveals …

Joe Flacco to start Browns' preseason finale; rookie QBs Dillon Gabriel, Shedeur Sanders also to play https://www.nfl.com/news/joe-flacco-start-browns-preseason-finale-rookie-qbs-dillon-gabriel-shedeur-sanders

Quasinormal Modes of a Massive Scalar Field in Slowly Rotating Einstein-Bumblebee Black Holes
Weike Deng, Wentao Liu, Fen Long, Kui Xiao, Jiliang Jing
https://arxiv.org/abs/2507.13978

Quasinormal Modes of a Massive Scalar Field in Slowly Rotating Einstein-Bumblebee Black Holes
In this study, we examine the impacts of black hole spin, Lorentz-violating parameter, and the scalar field's mass on quasinormal modes (QNMs) of rotating Einstein-Bumblebee black holes, including computations up to the second-order expansion in rotation parameters. We investigate two classes of Lorentz-violating rotating black holes: one constructed via the Newman-Janis algorithm and the other obtained by solving the field equations through a series expansion. Within the slow-rotation approxim…

Raiders mailbag: Could rookie WR earn starting role right away? https://www.reviewjournal.com/sports/raiders/raiders-mailbag-could-rookie-wr-earn-starting-role-right-away-3387408/

Rhoda Dakar - "The Man Who Sold The World" (2022)
So many good versions of this song. This one has been in heavy rotation on my iTunes lately.
Such a jaunty, classy version by one of the great voices of the 2nd wave ska era. Still going strong.
#music #covers

Rotating Quantum Droplets in Low Dimensions
Kevin Hern\'andez, El\'ias Castellanos
https://arxiv.org/abs/2506.16719 https://a…

Rotating Quantum Droplets in Low Dimensions
Quantum droplets formed by rubidium, lithium, and sodium atoms have been analyzed in this paper by using a logarithmic-type Gross-Pitaevskii equation. Variational methods and numerical techniques were employed to solve the corresponding nonlinear equations. A disk-shaped Bose-Einstein condensate was analyzed to assess its radial evolution. Additionally, free expansion under rotation of the BEC was studied. Compression and expansion around the equilibrium radius were observed in different scenar…

Giant Magneto-Optical Effects in Two-Dimensional Flat-Band Antiferromagnets
Ping Yang, Wanxiang Feng, Siyuan Liu, Shan Guan, Liwei Wen, Wei Jiang, Gui-Bin Liu, Yugui Yao
https://arxiv.org/abs/2506.16749

Giant Magneto-Optical Effects in Two-Dimensional Flat-Band Antiferromagnets
In this work, we reveal giant magneto-optical responses in two-dimensional(2D) antiferromagnets with nearly flat electronic bands, based on first-principles calculations and group-theoretical analysis. We identify a record-large second-order magneto-optical Schafer-Hubert(SH) effect, featuring a polarization rotation angle of 28 degree, in monolayer antiferromagnetic RuOCl2, driven by flatband-enhanced interband optical transitions. Both the valence and conduction bands exhibit pronounced direc…

Optical centrifuge for nanoparticles
Peiyao Xiong, Kit Ka Kelvin Ho, J. M. H. Gosling, M. Rademacher, P. F. Barker
https://arxiv.org/abs/2506.16134 https:/…

Optical centrifuge for nanoparticles
We study the creation of an optical centrifuge for the controlled rotation of levitated nanorotors within an optical tweezer. The optical centrifuge is created by rapidly rotating the linear polarization of the tightly focused optical field used to form an optical trap. We show that nanorotors, formed by anisotropic nanoparticles levitated within the trap, can be accelerated to well-defined rotational rates in excess of 100 MHz over durations of hundreds of microseconds. The initial conditions …

Data-Driven Adaptive Gradient Recovery for Unstructured Finite Volume Computations
G. de Rom\'emont, F. Renac, F. Chinesta, J. Nunez, D. Gueyffier
https://arxiv.org/abs/2507.16571

Data-Driven Adaptive Gradient Recovery for Unstructured Finite Volume Computations
We present a novel data-driven approach for enhancing gradient reconstruction in unstructured finite volume methods for hyperbolic conservation laws, specifically for the 2D Euler equations. Our approach extends previous structured-grid methodologies to unstructured meshes through a modified DeepONet architecture that incorporates local geometry in the neural network. The architecture employs local mesh topology to ensure rotation invariance, while also ensuring first-order constraint on the le…

Dallas Cowboys have no RB1 frontrunner entering training camp https://www.si.com/nfl/cowboys/news/dallas-cowboys-have-no-rb1-frontrunner-entering-training-camp

Kinematic Imprints of vortex-lines of BEC Dark Matter on Baryonic Matter
Iv\'an \'Alvarez-Rios, Carlos Tena-Contreras, Francisco S. Guzm\'an
https://arxiv.org/abs/2506.17535

Kinematic Imprints of vortex-lines of BEC Dark Matter on Baryonic Matter
Our results demonstrate that vortex lines in Bose-Einstein Condensate Dark Matter (BECDM) can act as gravitational seeds that induce the condensation of baryonic matter, leading to localized gas accumulation even in the absence of imposed symmetries or rotation. Our analysis is based on the numerical solution of the system of equations for the BECDM gravitationally coupled to Euler equations for a compressible ideal gas (IG) that we use as a model of baryonic matter. Numerical simulations are c…

Arbitrarily-high-dimensional reconciliation via cross-rotation for continuous-variable quantum key distribution
Jisheng Dai, Xue-Qin Jiang, Tao Wang, Peng Huang, Guihua Zeng
https://arxiv.org/abs/2508.06338

Arbitrarily-high-dimensional reconciliation via cross-rotation for continuous-variable quantum key distribution
Multidimensional rotation serves as a powerful tool for enhancing information reconciliation and extending the transmission distance in continuous-variable quantum key distribution (CV-QKD). However, the lack of closed-form orthogonal transformations for high-dimensional rotations has limited the maximum reconciliation efficiency to channels with 8 dimensions over the past decade. This paper presents a cross-rotation scheme to overcome this limitation and enable reconciliation in arbitrarily hi…

Replaced article(s) found for cond-mat.quant-gas. https://arxiv.org/list/cond-mat.quant-gas/new
[1/1]:
- Rotation quenches in trapped bosonic systems
Rhombik Roy, Sunayana Dutta, Ofir E. Alon

Modeling and Control of AWOISV: A Filtered Tube-Based MPC Approach for Simultaneous Tracking of Lateral Position and Heading Angle
Xu Yang, Jun Ni, Hengyang Feng, Feiyu Wang, Tiezhen Wang
https://arxiv.org/abs/2508.13457

Modeling and Control of AWOISV: A Filtered Tube-Based MPC Approach for Simultaneous Tracking of Lateral Position and Heading Angle
An all-wheel omni-directional independent steering vehicle (AWOISV) is a specialized all-wheel independent steering vehicle with each wheel capable of steering up to 90°, enabling unique maneuvers like yaw and diagonal movement. This paper introduces a theoretical steering radius angle and sideslip angle (\( θ_R \)-\(β_R \)) representation, based on the position of the instantaneous center of rotation relative to the wheel rotation center, defining the motion modes and switching criteria for…

MUSE-DARK-I: Dark matter halo properties of intermediate-z star-forming galaxies
B. I. Ciocan, N. F. Bouch\'e, J. Fensch, W. Mercier, D. Krajnovi\'c, J. Richard, T. Contini, A. Jeanneau
https://arxiv.org/abs/2506.19721

MUSE-DARK-I: Dark matter halo properties of intermediate-z star-forming galaxies
[Abridged] We analyse the dark matter (DM) halo properties of 127 0.3

Obstacle-tuned transition from chaotic to coherent vortex flows and odd diffusion in chiral active fluids
Joscha Mecke, Yongxiang Gao, Marisol Ripoll
https://arxiv.org/abs/2508.15210

Obstacle-tuned transition from chaotic to coherent vortex flows and odd diffusion in chiral active fluids
The interaction of a suspension of rotating colloids with a periodically patterned structure is here investigated by means of continuum theoretical predictions and hydrodynamic simulations. Close to the obstacle surface, rotors circulate opposite to their inherent direction of rotation as a result of unidirectional rotational stresses, which is in agreement with a prediction of the generalised Stokes equation. The resulting stationary background flow significantly affects the system dynamics an…

Axisymmetric landslides on small planetary bodies
Kumar Gaurav, Ishan Sharma
https://arxiv.org/abs/2508.15713 https://arxiv.org/pdf/2508.15713

Axisymmetric landslides on small planetary bodies
We aim to understand how landslides affect the shape and rotational motion of small rubble planetary bodies. We limit ourselves to axisymmetric global landslides, and take the primordial shape of the body to also be axisymmetric. The landslides are modeled through depth-averaging, while also incorporating the effect of the body's rotation, topographical changes due to multiple landslides, the body's non-uniform gravity field and possible surface mass shedding. The body's rotational dynamics is …

I just developed photos from April 26 which will be something entirely different for the rotation; here's the statue 𝐷𝑜𝑢𝑏𝑙𝑒 𝐴𝑙𝑙𝑖𝑢𝑚 at the Botanic Gardens visitor center which I made a 3-d scan on Scaniverse: https://scaniverse.com/scan/sh5rhmsgl5xqjhsj

The vertical structure of the stellar disk in NGC 551
Harshal Raut, Narendra Nath Patra, Prerana Biswas, Nirupam Roy, Veselina Kalinova, Sergio Dzib, Dario Colombo, Vicente Villanueva, Sebasti\'an F. S\'anchez
https://arxiv.org/abs/2506.19551

The vertical structure of the stellar disk in NGC 551
We self-consistently determine the 3D density distribution of NGC 551's stellar disk and study observational signatures of two-component stellar disks. Assuming baryonic disks are in hydrostatic equilibrium, we solved the Poisson-Boltzmann equation to estimate 3D density distribution. We used integral-field spectroscopic observations to estimate stellar velocity dispersion and built a 3D dynamical model using these density solutions and the observed rotation curve. We generated simulated surfac…

A unifying perspective on measuring transient planar extensional viscosity from exponential shear
L. A. Kroo, R. A. Nicholson, M. W Boehm, S. K. Baier, G. H. McKinley
https://arxiv.org/abs/2506.16667

A unifying perspective on measuring transient planar extensional viscosity from exponential shear
Here we present an experimentally practical and robust method to compute the transient extensional viscosity from exponential shear on a wide variety of viscoelastic complex fluids. To achieve this, we derive an analytical, frame-invariant continuum solution for the exponential shear material function, valid over all Weissenberg numbers. Specifically, we amend the original framework of Doshi and Dealy proposed in 1987 to explicitly address the effect of rotation of material elements, due to the…

Quantum modified inertia: an application to galaxy rotation curves
Jonathan Gillot
https://arxiv.org/abs/2507.11524 https://arxiv.org…

Quantum modified inertia: an application to galaxy rotation curves
This study explores the field of modified inertia through a novel model involving maximal and minimal acceleration bounds. A principle of dynamics is developed within special relativity and has direct implications in astrophysics, especially for galaxy rotation curves. The presence of a minimal acceleration significantly reduces the amount of dark matter required to account for these curves. The model presented here is however conceptually different from fiduciary Modified Newtonian Dynamics (M…

Modeling the coincident three-ion momentum imaging of diiodomethane photodissociation on reduced-dimensional potential energy surfaces
Yijue Ding
https://arxiv.org/abs/2507.14611 …

Modeling the coincident three-ion momentum imaging of diiodomethane photodissociation on reduced-dimensional potential energy surfaces
We present an efficient theoretical model to simulate observables in the time-resolved coincident three-ion Coulomb explosion experiment of diiodomethane. The model employs two degrees of freedom to characterize the C-I bond breaking and the $\text{CH}_2\text{I}$ rotation during photodissociation, and three degrees of freedom to characterize the coincident $\text{CH}_2^{+}+\text{I}^{2+}+\text{I}^{2+}$ fragmentation during the following Coulomb explosion. By solving the equation of motion, the p…

Rotation Errors Due to Field Quantization for Simultaneously Driven Atoms
Hunter Lindemann, Shanon Vuglar, Julio Gea-Banacloche
https://arxiv.org/abs/2508.06769 https://

Rotation Errors Due to Field Quantization for Simultaneously Driven Atoms
When an electromagnetic field in a coherent or quasiclassical (e.g., squeezed) state is used to simultaneously drive an ensemble of two-level atoms, the quantum nature of the field will, in general, cause the final state of the atoms to differ from the one predicted for a totally classical field. This is a potential source of error in quantum logic gates in which the gate is the rotation of the atoms by a laser. In this paper, we use second order perturbation theory to find how this error scale…

Anisotropic Neutrino Emission from Spinning, Moving, and Charged Primordial Black Holes
Arnab Chaudhuri
https://arxiv.org/abs/2508.14510 https://arxiv.org/…

Anisotropic Neutrino Emission from Spinning, Moving, and Charged Primordial Black Holes
The angular and spectral features of neutrinos emitted from primordial black holes (PBHs) carry key imprints of the black hole's fundamental properties. This work investigates the directional emission of neutrinos from Kerr-Newman PBHs undergoing Hawking evaporation, accounting for the combined effects of spin, motion, and electric charge. Rotation induces anisotropic fluxes through axisymmetric geometry and spin-dependent greybody factors, while relativistic motion leads to pronounced Doppler …

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…

Synthetic crystal rotation with spacetime metamaterials
I\~nigo Liberal, Alejandro Manjavacas
https://arxiv.org/abs/2506.02495 https://

Synthetic crystal rotation with spacetime metamaterials
The interaction of light with rotating bodies has been historically limited to rotation frequencies much smaller than optical frequencies. Here, we investigate synthetic crystal rotations, i.e., spatiotemporal modulations mimicking the rotation of an anisotropic crystal, which grant access to large rotation frequencies. Spatiotemporal modulations change the fundamental symmetries of the electromagnetic field, breaking temporal and rotation symmetries, but preserving a spatiotemporal rotation sy…

Contributions to the Theory of Clifford-Cyclotomic Circuits
Linh Dinh (Dalhousie University), Neil J. Ross (Dalhousie University)
https://arxiv.org/abs/2508.14674 https://

Contributions to the Theory of Clifford-Cyclotomic Circuits
Let $n$ be a positive integer divisible by 8. The Clifford-cyclotomic gate set $\mathcal{G}_n$ consists of the Clifford gates, together with a $z$-rotation of order $n$. It is easy to show that, if a circuit over $\mathcal{G}_n$ represents a unitary matrix $U$, then the entries of $U$ must lie in $\mathcal{R}_n$, the smallest subring of $\mathbb{C}$ containing $1/2$ and $\mathrm{exp}(2πi/n)$. The converse implication, that every unitary $U$ with entries in $\mathcal{R}_n$ can be represented by…

Felix Anudike-Uzomah injury: Chiefs' 2023 first-rounder placed on injured reserve, likely ending 2025 season

https://www.cbssports.com/nfl/news/felix-a…

Semi-analytical Study on the Polarized Images of Black Hole due to Frame Dragging
Xinyu Wang, Songbai Chen, Minyong Guo, Bin Chen
https://arxiv.org/abs/2508.15178 https://

Semi-analytical Study on the Polarized Images of Black Hole due to Frame Dragging
An initially retrograde accretion flow is transformed into a prograde configuration before plunging into the black hole, as a result of the frame-dragging effect induced by the black hole's rotation. The polarized image of a black hole shaped by such an accretion flow manifests three distinctive critical locations: the turning point of the flow's primary image, the polarization-flip location on the image plane, and the position of the primary image corresponding to the flow's actual turning poi…

Magnetically Driven Retrograde Precession in Misaligned Black Hole Accretion Flows
Hong-Xuan Jiang, Yosuke Mizuno, Dong Lai, Indu K. Dihingia, Christian M. Fromm
https://arxiv.org/abs/2507.13680

Magnetically Driven Retrograde Precession in Misaligned Black Hole Accretion Flows
Observations of accreting black hole (BH) systems, such as microquasars and supermassive black holes, often reveal a precessing jet with changing directions, indicating a misaligned accretion flow relative to the BH spin. The precession is commonly attributed to the Lense-Thirring (LT) effect, which arises from the BH's rotation twisting the surrounding spacetime and accretion flow. In the strongly magnetized regime, which is preferred accretion flow conditions for M~87$^*$ and likely other jet…

Evaluating the Limits of Rotation Period Recovery through Gyrochronology Criteria
Mariel Lares-Martiz, Terry D. Oswalt, Derek L. Buzasi, Kylie R. Boyer, Luca Guida, Ryan J. Reynolds
https://arxiv.org/abs/2507.08266

Evaluating the Limits of Rotation Period Recovery through Gyrochronology Criteria
Contamination from nearby sources often compromises stellar rotation periods derived from photometric light curves, particularly in data with large pixel scales such as TESS. This problem is compounded when both the target and contaminant are intrinsically variable, a scenario that challenges deblending algorithms, which often assume constant contaminants. We assess the reliability of rotation period detections using wide binary systems, whose components share a common age and rotational histor…

More on Bianchi I spacetimes and f(T) gravity
Alexey Golovnev, Mustafa M. Hemida
https://arxiv.org/abs/2508.15322 https://arxiv.org/pdf/2508.15322

More on Bianchi I spacetimes and f(T) gravity
Bianchi I cosmological solutions in f(T) gravity are discussed. We start from diagonal metrics and tetrads and show that their dynamical equations are pretty much tractable analytically, with a possible arena for physical applications. Then we derive a very bad unpredictability of the teleparallel connection in these configurations. Namely, even for the simple isotropic Friedmann universes, one might apply an arbitrary time-dependent spatial rotation to the standard tetrad without changing anyt…

Accelerating Signal-Temporal-Logic-Based Task and Motion Planning of Bipedal Navigation using Benders Decomposition
Jiming Ren, Xuan Lin, Roman Mineyev, Karen M. Feigh, Samuel Coogan, Ye Zhao
https://arxiv.org/abs/2508.13407

Accelerating Signal-Temporal-Logic-Based Task and Motion Planning of Bipedal Navigation using Benders Decomposition
Task and motion planning under Signal Temporal Logic constraints is known to be NP-hard. A common class of approaches formulates these hybrid problems, which involve discrete task scheduling and continuous motion planning, as mixed-integer programs (MIP). However, in applications for bipedal locomotion, introduction of non-convex constraints such as kinematic reachability and footstep rotation exacerbates the computational complexity of MIPs. In this work, we present a method based on Benders D…

Variability in Black Hole Accretion: Dependence on Rotational and Magnetic Energy Balance
Hyerin Cho, Ramesh Narayan
https://arxiv.org/abs/2507.13441 https…

Variability in Black Hole Accretion: Dependence on Rotational and Magnetic Energy Balance
Most general relativistic magnetohydrodynamic simulations of black hole (BH) hot accretion flows are initialized with small rotating tori and produce stable jets with only small fluctuations. However, recent studies using larger scale Bondi-like initial conditions have reported intermittent jet activity and loss of coherent rotation. To investigate the differences, we modify the standard torus setup across four BH spins: $a_*=0$, $0.5$, $0.9$, $-0.9$. First, we increase the torus size significa…

Coherent polarization self-rotation
Roy Shaham, Orr Meron, Or Katz, Dimitry Yankelev, Ofer Firstenberg
https://arxiv.org/abs/2506.01892 https://

Coherent polarization self-rotation
We introduce and study coherent polarization self-rotation (CPSR), a two-photon light-matter interaction in dense alkali-metal vapors that enables both narrowband optical spectroscopy of magnetic transitions and coherent coupling between light and collective atomic spins. Unlike conventional polarization self-rotation, CPSR requires initial spin polarization and a predominantly linearly polarized probe. It operates efficiently even in optically thick vapors with high buffer-gas pressure, rapid …

COS-EDGES: Co-rotation and Kinematic Stratification of the Multi-Phase CGM Around Edge-On Galaxies
Glenn G. Kacprzak, Benjamin D. Oppenheimer, Nikole M. Nielsen, Antonia Fernandez-Figueroa, Michael T. Murphy, Rebecca J. Allen, Tania M. Barone, Sameer, Christopher W. Churchill, Joseph N. Burchett, Kaustubh R. Gupta, Jane C. Charlton, Caleb B. Platukis

COS-EDGES: Co-rotation and Kinematic Stratification of the Multi-Phase CGM Around Edge-On Galaxies
We present the first results from the COS-EDGES survey, targeting the kinematic connection between the ISM and multi-phase circumgalactic medium (CGM) in nine isolated, edge-on galaxies at z~0.2, each probed along its major axis by a background quasar at impact parameters of 13-38kpc. Using VLT/UVES and HST/COS quasar spectra, we analyse MgI, MgII, HI, CII, CIII, and OVI absorption relative to galaxy rotation curves from Keck/LRIS and Magellan/MagE spectra. We find that at lower $D/R_{vir}$ ($D…

Differential rotation of solar {\alpha}-sunspots and implications for stellar light curves
Emily Joe L\"o{\ss}nitz, Alexander G. M. Pietrow, Hritam Chakraborty, Meetu Verma, Ioannis Kontogiannis, Horst Balthasar, Carsten Denker, Monika Lendl
https://arxiv.org/abs/2508.08196

Differential rotation of solar α-sunspots and implications for stellar light curves
Differential rotation is a key driver of magnetic activity and dynamo processes in the Sun and other stars, especially as the rate differs across the solar layers, but also in active regions. We aim to accurately quantify the velocity at which round α-spots traverse the solar disk as a function of their latitude, and compare these rates to those of the quiet-Sun and other sunspot types. We then extend this work to other stars and investigate how differential rotation affects the modulation of …

Velocity rotation curves in the gravimagnetic dipole spacetime
Cl\'ementine Dassy, Jan Govaerts
https://arxiv.org/abs/2508.08696 https://arxiv.org/pdf/…

Velocity rotation curves in the gravimagnetic dipole spacetime
The gravimagnetic dipole spacetime consists of two counter-rotating black holes of equal mass connected by a Misner string. For a particular distance in between them, the string is tensionless with the black holes at equilibrium with each other. The geodesics of relativistic massive, or massless particles are considered, leading to the identification of circular rotation trajectories. The velocities of these trajectories are computed.

The Status of the Astrophysical Parameters of Upper Main Sequence Stars
Lukas Kue{\ss} (Department of Astrophysics, Vienna University, T\"urkenschanzstra{\ss}e, Vienna, Austria), Ernst Paunzen (Department of Theoretical Physics and Astrophysics, Faculty of Science, Masaryk University, Kotl\'a\v{r}sk\'a, Brno, Czechia)
https://…

The Status of the Astrophysical Parameters of Upper Main Sequence Stars
Calibrating the ages, masses, and radii of stars on the upper main sequence depends heavily on accurate measurements of the effective temperature ($T_\mathrm{eff}$) and surface gravity ($\log g$). These parameters are difficult to obtain meticulously due to the nature of hot stars, which exhibit features such as rapid rotation, atomic diffusion, pulsation, and stellar winds. We compare the $T_\mathrm{eff}$, and $\log g$, values of apparent normal B-F stars in four recent catalogues that employ …

Evolving magnetic lives of Sun-like stars. I. Characterisation of the large-scale magnetic field with Zeeman-Doppler imaging
S. Bellotti, T. Lueftinger, S. Boro Saikia, C. P. Folsom, P. Petit, J. Morin, M. Gudel, J. -F. Donati, E. Alecian
https://arxiv.org/abs/2507.14861

Evolving magnetic lives of Sun-like stars. I. Characterisation of the large-scale magnetic field with Zeeman-Doppler imaging
Planets orbiting young, solar-type stars are embedded in a more energetic environment than that of the solar neighbourhood. They experience harsher conditions due to enhanced stellar magnetic activity and wind shaping the secular evolution of a planetary atmosphere. This study is dedicated to the characterisation of the magnetic activity of eleven Sun-like stars, with ages between 0.2 and 6.1 Gyr and rotation periods between 4.6 and 28.7 d. Based on a sub-sample of six stars, we aim to study th…

SDSO1 is a Ghost Planetary Nebula Bow Shock in Front of M31
Patrick Ogle, Mark Petersen, Tim Schaeffer, Lewis McCallum, Alberto Noriega-Crespo, R. Michael Rich, Biny Sebastian, Carl Bjork, Steeve Body, Sendhil Chinnasamy, Marcel Dreschsler, Tarun Kottary, Yann Sainty, Patrick Sparkman, Xavier Strottner
https://arxiv.org/abs/2507…

SDSO1 is a Ghost Planetary Nebula Bow Shock in Front of M31
We present new, deep narrow band imagery and discuss the nature of SDSO1, the large [O III]-emitting nebula centered 1.5 degrees SE of M31. We find strong evidence to support the hypothesis that SDSO1 is unrelated to M31 and is instead a bow shock driven by a faded, giant (D = 20 pc), 400 kyr-old, ghost planetary nebula (GPN) expelled by the symbiotic WD binary star EG Andromedae. Because EG And lags the rotation of the Milky Way, its hypersonic velocity of 107 km/s drives a shock into the loca…

Rotational Variables: Kepler Versus ASAS-SN
Jack Stethem (Department of Astronomy, The Ohio State University), Christopher S. Kochanek (Department of Astronomy, The Ohio State University, Center for Cosmology and AstroParticle Physics, The Ohio State University), Anya Phillips (Center for Astrophysics - Harvard and Smithsonian), Lyra Cao (Department of Physics and Astronomy, Vanderbilt University), Marc Pinsonneault (Department of Astronomy, The Ohio State University, Center for Cosmol…

Rotational Variables: Kepler Versus ASAS-SN
Rotational variables are stars that vary in brightness due to star spots modulated by rotation. They are probes of stellar magnetism, binarity, and evolution. Phillips et al. (2023) explored distinct populations of ~50,000 high-amplitude rotational variables from the All-Sky Automated Survey for Supernovae (ASAS-SN), examining correlations between stellar rotation, binarity, and activity. Here, we carry out a similar analysis of ~50,000 much lower amplitude Kepler rotational variables. The Kepl…

Four ages of rotating stars in the rotation--activity relationship and gyrochronology
Huiqin Yang, Jifeng Liu, Roberto Soria, Federico Spada, Song Wang, Xiangsong Fang, Xue Li
https://arxiv.org/abs/2506.07383

Four ages of rotating stars in the rotation--activity relationship and gyrochronology
Both of gyrochronology and the rotation-activity relationship are standard techniques to determine the evolution phase.The mismatch in the definition of the evolutionary phases has so far raised many issues in physics and mathematics and hampered the understanding of how the internal dynamo processes affect the observable properties.To address this problem, we seek a unified scheme that shows a one-to-one mapping from gyrochronology to the rotation--activity relationship.We obtained the chromos…

Kinematics of Circumgalactic O VI Gas and Disk Rotation of $z\approx0.2$ Star-forming Galaxies
Stephanie H. Ho, Crystal L. Martin, Hasti Nateghi, Glenn G. Kacprzak, Jonathan Stern
https://arxiv.org/abs/2507.11664

Kinematics of Circumgalactic O VI Gas and Disk Rotation of $z\approx0.2$ Star-forming Galaxies
Quasar sightline observations reveal that low-ionization-state gas corotates with the galaxy disk and often at sub-centrifugal velocities, suggesting that the gas is spiraling towards the galaxy disk. However, while observations ubiquitously detect O VI absorption around low-redshift, $\sim L^*$ star-forming galaxies, the relationship between O VI and the galaxy disk, especially the kinematics, is not well-established. This work focuses on the O VI kinematics and its comparison with that of the…

Anomalously fast core and envelope rotation in red giants
Siddharth Dhanpal, Othman Benomar, Shravan Hanasoge, Jim Fuller
https://arxiv.org/abs/2506.06415 …

Anomalously fast core and envelope rotation in red giants
Red giants undergo dramatic and complex structural transformations as they evolve. Angular momentum is transported between the core and envelope during this epoch, a poorly understood process. Here, we infer envelope and core rotation rates from Kepler observations of $\sim$1517 red giants. While many measurements are consistent with the existing studies, our investigation reveals systematic changes in the envelope-to-core rotation ratio and we report the discovery of anomalies such as clump st…

The role of rotation on the yields of the two {\gamma}-ray emitters 26Al and 60Fe ejected by massive stars
Agnese Falla, Lorenzo Roberti, Marco Limongi, Alessandro Chieffi
https://arxiv.org/abs/2508.07705

The role of rotation on the yields of the two γ-ray emitters 26Al and 60Fe ejected by massive stars
We show that the observed 60Fe/26Al flux ratio provided by the SPectrometer on INTEGRAL satellite (0.24 +- 0.04) can be reproduced only if rotation is taken into account in the computation of the stellar models. Predictions from non-rotating stellar models yield to a significantly lower ratio (0.062), which is incompatible with the observed value. The adopted models and the associated yields are based on a combination of models already published by Limongi & Chieffi (2018) complemented by addit…

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…

New Rotation Periods from the Kepler Bonus Background Light Curves
Zachary R. Claytor, Jamie Tayar
https://arxiv.org/abs/2506.03248 https://

New Rotation Periods from the Kepler Bonus Background Light Curves
The Kepler field hosts the best studied sample of field star rotation periods. However, due to Kepler's large 4" pixels, many of its light curves are at high risk of contamination from background sources. The new Kepler Bonus Background light curves are de-blended using a PSF algorithm, providing light curves of over 400,000 new background sources in addition to over 200,000 re-analyzed Kepler prime targets. These light curves provide the opportunity to search for new rotation periods. Here we …