Tootfinder

Large-order perturbation theory of linear eigenvalue problems
Stephen Jonathan Chapman
https://arxiv.org/abs/2509.14763 https://arxiv.org/pdf/2509.14763

Large-order perturbation theory of linear eigenvalue problems
We consider a class of linear eigenvalue problems depending on a small parameter epsilon in which the series expansion for the eigenvalue in powers of epsilon is divergent. We develop a new technique to determine the precise nature of this divergence. We illustrate the technique through its application to four examples: the anharmonic oscillator, a simplified model of equitorially-trapped Rossby waves, and two simplified models based on quasinormal modes of Reissner-Normstrom de Sitterblack hol…

Search for Quantum Decoherence with 10.7 years of atmospheric $\nu_\mu$ events in IceCube
Tanvi Krishnan (for the IceCube Collaboration)
https://arxiv.org/abs/2507.12316

Search for Quantum Decoherence with 10.7 years of atmospheric $ν_μ$ events in IceCube
In order to develop a consistent quantum theory of gravity, we must understand the nature of spacetime at the Planck scale. In particular if it exhibits quantum fluctuations, they may cause propagating particles to evolve in an apparently non-unitary manner. Neutrinos, which interact only via the weak force and gravity, maintain quantum coherence while propagating over large distances. Thus, neutrino oscillations serve as a precise interferometer to search for Planck-scale fluctuations of space…

It feels like Trump is running into the inherent problems of international diplomacy among a world order of autocrats.
He tells Putin to stop bombing Ukraine, Putin says yes and does no. He tells Netanyahu to stop attacking Syria, Netanyahu says yes and does no.
Their nature as autocrats is that they do not respect a leader above them. They cannot be seen to respect a leader above them. Realists like Rutte are happy to play obsequious, but the "strong men" never will.

Planar Ballistic Electron Emission Spectroscopy for Single-Shot Probing of Energy Barrier Inhomogeneity at Junction Interface
Jiwan Kim, Jaehyeong Jo, Jungjae Park, Hyunjae Park, Eunseok Hyun, Jisang Lee, Sejin Oh, Kibog Park
https://arxiv.org/abs/2509.11037

Planar Ballistic Electron Emission Spectroscopy for Single-Shot Probing of Energy Barrier Inhomogeneity at Junction Interface
We propose an experimental methodology for probing the energy barrier inhomogeneity at the metal/semiconductor interface without the need for time-consuming microscopic survey. It is based on the known statistical nature of the interfacial energy barrier and the use of planar tunnel junction as an array of parallelly-connected ballistic electron emission microscopy (BEEM) tips. In order to analyze a lump of local BEEM signals, we incorporate the Tung model into the Bell-Kaiser theory. To valida…

Theory of Spiral Magnetism in Weyl semimetal SmAlSi
Lasin Thaivalappil, Rahul Verma, Hsin Lin, Bahadur Singh, Shin-Ming Huang
https://arxiv.org/abs/2508.11244 https://

Theory of Spiral Magnetism in Weyl semimetal SmAlSi
Recent neutron scattering and thermodynamic measurements suggest that Weyl electrons in the emergent Weyl semimetal SmAlSi mediate unconventional magnetic interactions and induce spiral magnetic order. In this work, we investigate the nature of these interactions by modelling long-range $f-f$ exchange mediated by itinerant $d$ electrons via the Ruderman-Kittel-Kasuya-Yosida (RKKY) mechanism, employing a material-specific tight-binding Hamiltonian obtained from first-principles calculations. The…

Even terrorism is subject to inflation, as accusations of people for simply having an opposing opinion prove.

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…

Towards an Efficient Shifted Cholesky QR for Applications in Model Order Reduction using pyMOR
Maximilian Bindhak, Art J. R. Pelling, Jens Saak
https://arxiv.org/abs/2507.07788

Towards an Efficient Shifted Cholesky QR for Applications in Model Order Reduction using pyMOR
Many model order reduction (MOR) methods rely on the computation of an orthonormal basis of a subspace onto which the large full order model is projected. Numerically, this entails the orthogonalization of a set of vectors. The nature of the MOR process imposes several requirements for the orthogonalization process. Firstly, MOR is oftentimes performed in an adaptive or iterative manner, where the quality of the reduced order model, i.e., the dimension of the reduced subspace, is decided on the…

How popular media gets love wrong
Had some thoughts in response to a post about loneliness on here. As the author emphasized, reassurances from people who got lucky are not terribly comforting to those who didn't, especially when the person who was lucky had structural factors in their favor that made their chances of success much higher than those is their audience. So: these are just my thoughts, and may not have any bearing on your life. I share them because my experience challenged a lot of the things I was taught to believe about love, and I think my current beliefs are both truer and would benefit others seeing companionship.
We're taught in many modern societies from an absurdly young age that love is not something under our control, and that dating should be a process of trying to kindle love with different people until we meet "the one" with whom it takes off. In the slightly-less-fairytale corners of modern popular media, we might fund an admission that it's possible to influence love, feeding & tending the fire in better or worse ways. But it's still modeled as an uncontrollable force of nature, to be occasionally influenced but never tamed. I'll call this the "fire" model of love.
We're also taught (and non-boys are taught more stringently) a second contradictory model of love: that in a relationship, we need to both do things and be things in order to make our partner love us, and that if we don't, our partner's love for us will wither, and (especially if you're not a boy) it will be our fault. I'll call this the "appeal" model of love.
Now obviously both of these cannot be totally true at once, and plenty of popular media centers this contradiction, but there are really very few competing models on offer.
In my experience, however, it's possible to have "pre-meditated" love. In other words, to decide you want to love someone (or at least, try loving them), commit to that idea, and then actually wind up in love with them (and them with you, although obviously this second part is not directly under your control). I'll call this the "engineered" model of love.
Now, I don't think that the "fire" and "appeal" models of love are totally wrong, but I do feel their shortcomings often suggest poor & self-destructive relationship strategies. I do think the "fire" model is a decent model for *infatuation*, which is something a lot of popular media blur into love, and which drives many (but not all) of the feelings we normally associate with love (even as those feelings have other possible drivers too). I definitely experienced strong infatuation early on in my engineered relationship (ugh that sounds terrible but I'll stick with it; I promise no deception was involved). I continue to experience mild infatuation years later that waxes and wanes. It's not a stable foundation for a relationship but it can be a useful component of one (this at least popular media depicts often).
I'll continue these thoughts in a reply, by it might take a bit to get to it.
#relationships

Framework for Formal Modelling of Metaverse Applications Using Hierarchical Colored Petri Nets
Maryam Amin, Umara Noor, Zahid Rashid, Jorn Altmann
https://arxiv.org/abs/2509.10936

Framework for Formal Modelling of Metaverse Applications Using Hierarchical Colored Petri Nets
The Metaverse emerges by integrating highly-distributed, complex, and interconnecting technologies. These technologies need to be formally verified and evaluated through formal modelling before executing them in real-world applications, in order to avoid negative impacts on the real world due to failure of the Metaverse technologies. However, the formal modelling of Metaverse technologies is challenging due to its highly complex nature. Therefore, a comprehensive formal verification of the Meta…

I only realized recently that in #nature, every #offspring number that exceeds the number of parents (usually 2) is going to die more or less early (as food for other species) in order to keep the population under control.
(num animals dying early) = (num offspring) - (num parents)
So if a spec…

Dynamic and Continuous Control of Second-Harmonic Chirality through Lithium Niobate Nonlocal Metasurface
Yiwen Liu, Chao Meng, Sergey I. Bozhevolnyi, Fei Ding
https://arxiv.org/abs/2509.12745

Dynamic and Continuous Control of Second-Harmonic Chirality through Lithium Niobate Nonlocal Metasurface
Nonlinear chiral light sources are crucial for emerging applications in chiroptics, including ultrafast spin dynamics and quantum state manipulation. However, achieving precise and dynamic control over nonlinear optical chirality with natural materials and metasurfaces, particularly those based on non-centrosymmetric materials such as lithium niobate (LN), is hindered by the complex tensorial nature of the second-order nonlinear susceptibility. Here, we demonstrate a nonlinear nonlocal metasurf…

Order-disorder-order transitions and winning margins' scaling in kinetic exchange opinion model
Soumyajyoti Biswas, Mandhalapu Sree Annapurna, Venkatasubbaiah Jakkampudi, Dushyanth Yarlagadda, Bhargav Thota
https://arxiv.org/abs/2508.06237

Order-disorder-order transitions and winning margins' scaling in kinetic exchange opinion model
The kinetic exchange opinion model shows a well-studied order disorder transition as the noise parameter, representing discord between interacting agents, is increased. A further increase in the noise drives the model, in low dimensions, to an extreme segregation ordering through a transition of similar nature. The scaling behavior of the winning margins have distinct features in the ordered and disordered phases that are similar to the observations noted recently in election data in various co…

Thermal aspects of the anomalous $\omega \to \infty$ limit of Brans-Dicke gravity
L. Gallerani, A. Giusti, A. Mentrelli, V. Faraoni
https://arxiv.org/abs/2508.00498 https://

Thermal aspects of the anomalous $ω\to \infty$ limit of Brans-Dicke gravity
Brans-Dicke gravity does not always reduce to General Relativity in the limit $ω\to\infty$ for the coupling constant. This anomalous behavior is examined within the formalism of the first-order thermodynamics of scalar-tensor gravity. It is shown that this effect is linked to the non-vanishing nature of the chemical potential, in the Einstein frame formulation of the thermodynamic analogy, in the $ω\to\infty$ limit.

Chladni states in Ising Spin Lattices
Giulio Iannelli, Pablo Villegas
https://arxiv.org/abs/2507.05961 https://arxiv.org/pdf/2507.059…

Chladni states in Ising Spin Lattices
Spontaneous symmetry breaking is the core concept for understanding the emergence of collective order. In finite-dimensional systems, however, the nature of the broken phase is often constrained by the compatibility between spontaneous order and the microscopic symmetries of the underlying lattice. Here, we propose the topological substratum on which Ising spin lattices exhibit long-range order when cooled under non-ergodic conditions. Our topological decomposition, tantamount to resonating san…

Analysis and Design of Spare Strategy for Large-Scale Satellite Constellation Using Markov Chain
Seungyeop Han, Zachary Grieser, Shoji Yoshikawa, Takumi Noro, Takumi Suda, Koki Ho
https://arxiv.org/abs/2509.09957

Analysis and Design of Spare Strategy for Large-Scale Satellite Constellation Using Markov Chain
This paper presents a method for analyzing and designing an optimal spare-management policy in large-scale satellite constellations using a Markov chain model. To capture the stochastic nature of satellite failures and launch vehicle lead times, we adopt Markov chains to model both failure and replenishment processes. We reinvestigate an indirect spare strategy, modeled as a multi-echelon periodic-review reorder-point/order-quantity policy, in which spares are first delivered to parking orbits …

Non-orientable regular maps with negative prime-power Euler characteristic
Marston Conder, Nick Gill, Jozef \v{S}ir\'a\v{n}
https://arxiv.org/abs/2507.03667

Non-orientable regular maps with negative prime-power Euler characteristic
In this paper we provide a classification of all regular maps on surfaces of Euler characteristic $-r^d$ for some odd prime $r$ and integer $d\ge 1$. Such maps are necessarily non-orientable, and the cases where $d = 1$ or $2$ have been dealt with previously. This classification splits naturally into three parts, based on the nature of the automorphism group $G$ of the map, and particularly the structure of its quotient $G/O(G)$ where $O(G)$ is the largest normal subgroup of $G$ of odd order.…

Ionization/dissociation-driven first order phase transitions: on a new class of first order phase transitions
Genri Norman, Ilnur Saitov
https://arxiv.org/abs/2509.01273 https:/…

Ionization/dissociation-driven first order phase transitions: on a new class of first order phase transitions
In this work, we compare various models for describing the phase transition of the fluid hydrogen into a conducting state, including both chemical models of plasma and first-principle simulations within the framework of the density functional theory (DFT). The comparison of the results indicates the plasma nature of the phase transition in warm dense hydrogen. We propose a concept of a new class of first-order phase transitions: ionization or dissociation-driven phase transitions, with which th…

Invariant inter-subject relational structures in high order human visual cortex #neuroscience

Invariant inter-subject relational structures in high order human visual cortex - Nature Communications
The neuronal coding principles that underlie inter-individual perceptual similarities remains unclear. Here, the authors compared the stability of relational similarity versus activation patterns across brains and found that relational similarity was preferentially consistent across individuals, potentially underlying shared inter-subject perception.

Attractors for Second Order in Time Non-Conservative Dynamics with Nonlinear Damping
Irena Lasiecka, Jose H. Rodrigues, Madhumita Roy
https://arxiv.org/abs/2507.04154

Attractors for Second Order in Time Non-Conservative Dynamics with Nonlinear Damping
A long-time behavior of solutions to a nonlinear plate model subject to non-conservative and non-dissipative effects and nonlinear damping is considered. The model under study is a prototype for a suspension bridge under the effects of unstable flow of gas. To counteract the unwanted oscillations a damping mechanism of a nonlinear nature is applied. From the point of view of nonlinear PDEs, we are dealing with a non-dissipative and nonlinear second order in time dynamical system of hyperbolic n…

Stranski-Krastanov Growth of Disordered ScNx Thin Films on MgO(100): Influence of Defect Densities on Electronic Structure and Transport Properties
Susmita Chowdhury, Rachana Gupta, Najnin Bano, Yogesh Kumar, Shashi Prakash, Dinesh Kumar Shukla, Vasant G. Sathe, Mukul Gupta
https://arxiv.org/abs/2508.05330

Stranski-Krastanov Growth of Disordered ScNx Thin Films on MgO(100): Influence of Defect Densities on Electronic Structure and Transport Properties
We report a nascent real time Stranski-Krastanov growth of reactively sputtered ScNx thin films on MgO(100). The epitaxial growth was limited to 5 nm at a substrate temperature (Ts) of 25 C while the self-sustaining epitaxial nature along the [100] azimuth was retained up to 25 nm in Ts = 250 and 500 C samples due to enhanced adatom mobility. At Ts = 700 C, the film showed half order in-situ RHEED pattern, with forbidden (hkl) planes indicating N deficient hcp Sc-N phase. Presence of defect den…

Fixed points of Personalized PageRank centrality: From irreducible to reducible networks
David Aleja, Julio Flores, Eva Primo, Daniel Rodr\'iguez, Miguel Romance
https://arxiv.org/abs/2507.18652

Fixed points of Personalized PageRank centrality: From irreducible to reducible networks
In this paper we analyze the PageRank of a complex network as a function of its personalization vector. By using this approach, a complete characterization of the existence and uniqueness of fixed points of PageRank of a graph is given in terms of the number and nature of its strongly connected components. The method presented includes the use of a feedback-PageRank in order to compute exactly the fixed points following the classic Power's Method in terms of the (left-hand) Perron vector of eac…

Nodeless superconductivity in 4H$_{b}$-TaS$_{2}$ with broken time reversal symmetry
Yuwei Zhou, Fanyu Meng, Yanen Huang, Jiawen Zhang, Jin Zhan, Ye Chen, Yu Liu, Hechang Lei, Michael Smidman, Huiqiu Yuan
https://arxiv.org/abs/2507.07584

Nodeless superconductivity in 4H$_{b}$-TaS$_{2}$ with broken time reversal symmetry
The transition metal dichalcogenide 4H$_{b}$-TaS$_{2}$ exhibits characteristics of topological edge modes and two-component superconductivity with time-reversal symmetry breaking (TRSB). The nature of the superconducting order parameter is a crucial issue that requires experimental investigation. Here, we report measurements of the magnetic penetration depth using a tunnel-diode-oscillator based technique, as well as the specific heat. Both the specific heat and the change in magnetic penetrati…

Toward Cyclic A.I. Modelling of Self-Regulated Learning: A Case Study with E-Learning Trace Data
Andrew Schwabe, \"Ozg\"ur Akg\"un, Ella Haig
https://arxiv.org/abs/2507.02913

Toward Cyclic A.I. Modelling of Self-Regulated Learning: A Case Study with E-Learning Trace Data
Many e-learning platforms assert their ability or potential to improve students' self-regulated learning (SRL), however the cyclical and undirected nature of SRL theoretical models represent significant challenges for representation within contemporary machine learning frameworks. We apply SRL-informed features to trace data in order to advance modelling of students' SRL activities, to improve predictability and explainability regarding the causal effects of learning in an eLearning environment…

Adaptive Reduced Basis Trust Region Methods for Parabolic Inverse Problems
Michael Kartmann, Benedikt Klein, Mario Ohlberger, Thomas Schuster, Stefan Volkwein
https://arxiv.org/abs/2507.11130

Adaptive Reduced Basis Trust Region Methods for Parabolic Inverse Problems
We consider nonlinear inverse problems arising in the context of parameter identification for parabolic partial differential equations (PDEs). For stable reconstructions, regularization methods such as the iteratively regularized Gauss-Newton method (IRGNM) are commonly used, but their application is computationally demanding due to the high-dimensional nature of PDE discretizations. To address this bottleneck, we propose a reduced-order modeling approach that accelerates both the state and adj…

A real-time search for Type Ia Supernovae with late-time CSM interaction in ZTF
Jacco H. Terwel, Kate Maguire, Se\'an J. Brennan, Llu\'is Galbany, Simeon Reusch, Steve Schulze, Niilo Koivisto, Tapio Pursimo, Samuel Grund S{\o}rensen, Mar\'ia Alejandra D\'iaz Teodori, Astrid Guldberg Theil, Mikael Turkki, Tom\'as E. M\"uller-Bravo, Umut Burgaz, Young-Lo Kim, Joshua S. Bloom, Matthew J. Graham, Mansi M. Kasliwal, Shri R. Kulkarni, Frank J. Masci, Josiah Purdum, O…

A real-time search for Type Ia Supernovae with late-time CSM interaction in ZTF
The nature of Type Ia supernova (SN Ia) progenitor systems and the mechanisms that lead up to their explosions are still widely debated. In rare cases the SN ejecta interact with circumstellar material (CSM) that was ejected from the progenitor system prior to the SN. The unknown distance between the CSM and SN explosion site makes it impossible to predict when the interaction will start. If the time between the SN and start of CSM interaction is of the order of months to years the SN has gener…

Sound Interval-Based Synthesis for Probabilistic Programs
Guilherme Espada, Alcides Fonseca
https://arxiv.org/abs/2507.06939 https://…

Sound Interval-Based Synthesis for Probabilistic Programs
Probabilistic programming has become a standard practice to model stochastic events and learn about the behavior of nature in different scientific contexts, ranging from Genetics and Ecology to Linguistics and Psychology. However, domain practitioners (such as biologists) also need to be experts in statistics in order to select which probabilistic model is suitable for a given particular problem, relying then on probabilistic inference engines such as Stan, Pyro or Edward to fine-tune the param…

Mechanical properties of the $\Omega^-$ baryon from gravitational form factors
Zeinab Dehghan, K. Azizi
https://arxiv.org/abs/2507.14840 https://

Mechanical properties of the $Ω^-$ baryon from gravitational form factors
We present a comprehensive investigation of the mechanical properties of the $Ω^-$ baryon by analyzing its gravitational form factors (GFFs) within the framework of QCD sum rules. These form factors encode rich information about the internal structure of hadrons and offer deep insights into the dynamics that govern their stability. The spin-3/2 nature of the $Ω^-$ baryon manifests in its gravitational form factors as intricate multipole structures, which encapsulate higher-order deformations …

MOCHA: Discovering Multi-Order Dynamic Causality in Temporal Point Processes
Yunyang Cao, Juekai Lin, Wenhao Li, Bo Jin
https://arxiv.org/abs/2508.18873 https://

MOCHA: Discovering Multi-Order Dynamic Causality in Temporal Point Processes
Discovering complex causal dependencies in temporal point processes (TPPs) is critical for modeling real-world event sequences. Existing methods typically rely on static or first-order causal structures, overlooking the multi-order and time-varying nature of causal relationships. In this paper, we propose MOCHA, a novel framework for discovering multi-order dynamic causality in TPPs. MOCHA characterizes multi-order influences as multi-hop causal paths over a latent time-evolving graph. To model…

Reduced-order modeling of large-scale turbulence using Koopman $\beta$-variational autoencoders
Rakesh Halder, Benet Eiximeno, Oriol Lehmkuhl
https://arxiv.org/abs/2507.18754 ht…

Reduced-order modeling of large-scale turbulence using Koopman $β$-variational autoencoders
Reduced-order models (ROM) are very popular for surrogate modeling of full-order computational fluid dynamics (CFD) simulations, allowing for real-time approximation of complex flow phenomena. However, their application to CFD models including large eddy simulation (LES) and direct numerical simulaton (DNS) is limited due to the highly chaotic and multi-scale nature of resolved turbulent flow. Due to the large amounts of noise present in small-scale turbulent structures, error propagation becom…

Dark energy constraints in light of theoretical priors
Neel Shah, Kazuya Koyama, Johannes Noller
https://arxiv.org/abs/2507.19450 https://arxiv.org/pdf/250…

Dark energy constraints in light of theoretical priors
In order to derive model-independent observational bounds on dark energy/modified gravity theories, a typical approach is to constrain parametrised models intended to capture the space of dark energy theories. Here we investigate in detail the effect that the nature of these parametrisations can have, finding significant effects on the resulting cosmological dark energy constraints. In order to observationally distinguish well-motivated and physical parametrisations from unphysical ones, it is …

The description of the policy of Trump and the MAGA regime:

An equivalence between time-symmetry and cyclic causality in quantum theory
Eliot Jean, Ralph Silva, V. Vilasini
https://arxiv.org/abs/2508.02463 https://a…

An equivalence between time-symmetry and cyclic causality in quantum theory
Understanding the relationship between the time-symmetric nature of physical laws and the apparent directionality of causality is a central question in quantum foundations. The standard operational formulation, widely used in quantum information, imposes a definite, acyclic causal order on agents' operations, contrasting with time-symmetric dynamics. Two prominent extensions of this framework are the multi-time state (MTS) formalism, which incorporates time symmetry via arbitrary pre- and post-…

Defining and classifying models of groups: The social ontology of higher-order networks
Jonathan St-Onge, Randall Harp, Giulio Burgio, Timothy M. Waring, Juniper Lovato, Laurent H\'ebert-Dufresne
https://arxiv.org/abs/2507.02758

Defining and classifying models of groups: The social ontology of higher-order networks
In complex systems research, the study of higher-order interactions has exploded in recent years. Researchers have formalized various types of group interactions, such as public goods games, biological contagion, and information broadcasting, showing how higher-order networks can capture group effects more directly than pairwise models. However, equating hyperedges-edges involving more than two agents-with groups can be misleading, as it obscures the polysemous nature of ``group interactions''.…

Nitrogen-related short-range order in Fe-Ni-Cr austenitic stainless steels: first principles and cluster expansion study
Tianyu Su, Brian J. Blankenau, Namhoon Kim, Jessica A. Krogstad, Elif Ertekin
https://arxiv.org/abs/2507.04580

Nitrogen-related short-range order in Fe-Ni-Cr austenitic stainless steels: first principles and cluster expansion study
Nitrogen (N) is a key alloying element that enhances the performance of Fe-Ni-Cr austenitic stainless steels, improving austenite stability, corrosion resistance, and yield strength. However, the role of N in modifying chemical ordering, particularly short-range order (SRO) and long-range order (LRO), is complex due to the multi-sublattice nature and magnetic interactions in these alloys. In this work, we combine first-principles calculations with the spin cluster expansion (spin CE) method to …

Ti\={a}ngu\={a}n ($\zeta$ Tau) as a binary system consisting of a Be-star and an accreting White Dwarf: opening a gate to understanding enigmatic $\gamma$ Cas analogues
Jes\'us A. Toal\'a, Lidia M. Oskinova, Diego A. Vasquez-Torres
https://arxiv.org/abs/2507.05203

Tiānguān ($ζ$ Tau) as a binary system consisting of a Be-star and an accreting White Dwarf: opening a gate to understanding enigmatic $γ$ Cas analogues
The analogues of $γ$ Cassiopea are binary early type Be stars which are X-ray bright and have hard thermal X-ray spectra. The nature of low-mass companions in these stars and mechanisms of their X-ray emission remain enigmatic. Among the proposed ideas is the presence of an accretion disc around a white dwarf (WD) companion to the Be star donor. We use modern radiative transfer models accounting for reflection physics in order to calculate the synthetic spectra of such systems, and assume that…

Scaling approach to rigid and soft nuclear deformation through flow fluctuations in high-energy nuclear collisions
Lumeng Liu, Chunjian Zhang, Jinhui Chen, Jiangyong Jia, Xu-Guang Huang, Yu-Gang Ma
https://arxiv.org/abs/2509.09376

Scaling approach to rigid and soft nuclear deformation through flow fluctuations in high-energy nuclear collisions
The nature of octupole deformation, whether static or vibrational, remains an open question in nuclear physics. Here, we propose a scaling approach to probe this ambiguity by triangular flow fluctuations using multi-particle cumulants, $c_{3,\varepsilon}\{4\}$, in relativistic $^{238}$U+$^{238}$U collisions. We demonstrate that both $|c_{3,\varepsilon}\{4\}|$ and the ratio $|c_{3,\varepsilon}\{4\}/c^2_{3,\varepsilon}\{2\}|$ scale linearly with the fourth-order moment of octu…

ByteGen: A Tokenizer-Free Generative Model for Orderbook Events in Byte Space
Yang Li, Zhi Chen
https://arxiv.org/abs/2508.02247 https://arxiv.org/pdf/2508…

Soliton-like Rogue Wave Dynamics in Dissipative Higher-Order NLS Models: A Floquet Spectral Perspective
C. M. Schober, A. Islas
https://arxiv.org/abs/2507.20375 https://

Soliton-like Rogue Wave Dynamics in Dissipative Higher-Order NLS Models: A Floquet Spectral Perspective
We investigate rogue wave formation and spectral downshifting in the higher-order nonlinear Schrödinger (HONLS) equation and its dissipative extensions: the nonlinear mean-flow damping model (NLD-HONLS) and the viscous damping model (V-HONLS). By applying Floquet spectral analysis, we characterize i) the structural organization of the dynamical background and ii) the nature of the rogue waves that appear, distinguishing sharply localized, soliton-like structures from more diffuse, spatially ex…

Weak Field Limit of the Nonminimally Coupled Weyl Connection Gravity
Cl\'audio Gomes
https://arxiv.org/abs/2506.16532 https://arx…

Weak Field Limit of the Nonminimally Coupled Weyl Connection Gravity
The true nature of gravity is a remarkable open problem in Gravitation. Theoretical and observational motivations open the avenue of alternative theories of gravity. One possibility resorts to nonminimal couplings and non-metricity properties of spacetime, and is dubbed as nonminimally coupled Weyl connection gravity. It has the advantage of leading to metric field equations of second order together with a constraint equation for the Weyl vector, and has well behaved space-form. We analyse this…

Compact, intense attosecond sources driven by hollow Gaussian beams
Rodrigo Mart\'in-Hern\'andez, Melvin Redon, Ann-Kathrin Raab, Saga Westerberg, Victor Koltalo, Chen Guo, Anne-Lise Viotti, Luis Plaja, Julio San Rom\'an, Anne L'Huillier, Cord L. Arnold, Carlos Hern\'andez-Garc\'ia
https://arxiv.org/abs/2…

Compact, intense attosecond sources driven by hollow Gaussian beams
High-order harmonic generation (HHG) enables the up-conversion of intense infrared or visible femtosecond laser pulses into extreme-ultraviolet attosecond pulses. However, the highly nonlinear nature of the process results in low conversion efficiency, which can be a limitation for applications requiring substantial pulse energy, such as nonlinear attosecond time-resolved spectroscopy or single-shot diffractive imaging. Refocusing of the attosecond pulses is also essential to achieve a high int…

Symmetry re-breaking in an effective theory of quantum coarsening
Federico Balducci, Anushya Chandran, Roderich Moessner
https://arxiv.org/abs/2507.17386 https://

Symmetry re-breaking in an effective theory of quantum coarsening
We present a simple theory accounting for two central observations in a recent experiment on quantum coarsening and collective dynamics on a programmable quantum simulator [T. Manovitz et al., Nature 638, 86 (2025)]: an apparent speeding up of the coarsening process as the phase transition is approached; and persistent oscillations of the order parameter after quenches within the ordered phase. Our theory, based on the Hamiltonian structure of the equations of motion in the classical limit of t…

Stabilization techniques for immersogeometric analysis of plate and shell problems in explicit dynamics
Giuliano Guarino, Yannis Voet, Pablo Antolin, Annalisa Buffa
https://arxiv.org/abs/2509.00522

Stabilization techniques for immersogeometric analysis of plate and shell problems in explicit dynamics
Finite element plate and shell formulations are ubiquitous in structural analysis for modeling all kinds of slender structures, both for static and dynamic analyses. The latter are particularly challenging as the high order nature of the underlying partial differential equations and the slenderness of the structures all impose a stringent constraint on the critical time step in explicit dynamics. Unfortunately, badly cut elements in immersed finite element discretizations further aggravate the …

Nature of magnetic exchange interactions in kagome antiferromagnets FeGe and FeSn
Yitao Zheng, Yan Zhu, Jun Hu
https://arxiv.org/abs/2509.04228 https://arx…

Nature of magnetic exchange interactions in kagome antiferromagnets FeGe and FeSn
Magnetic exchange interactions (MEIs) in kagome magnets exhibit rich features due to the interplay of charge, spin, orbital and lattice degrees of freedom, giving rise to a variety of exotic quantum states. Through first-principles calculations, we systematically investigate the MEIs in kagome antiferromagnets FeGe and FeSn. While the antiferromagnetic order originates from the interlayer coupling between neighboring kagome layers, Fe atoms within each kagome layer couple ferromagnetically, dri…

Extracting the singularity of the logarithmic partition function
Zhe Wang, Yi-Ming Ding, Zenan Liu, Zheng Yan
https://arxiv.org/abs/2506.16111 https://

Extracting the singularity of the logarithmic partition function
In principle, the logarithm of the partition function and its derivatives can be used to rigorously determine the nature of phase transitions. However, in practice, this approach is often ineffective in numerical calculations, since resolving the singularities of the logarithmic partition function requires extremely high precision data especially when distinguishing between weakly first order phase transitions and deconfined quantum critical points. Based on the finite size scaling hypothesis, …

Microscopic Theory of Light-Induced Coherent Phonons Mediated by Quantum Geometry
Jiaming Hu, Zhichao Guo, Wenbin Li, Hua Wang, Kai Chang
https://arxiv.org/abs/2508.03257 https:…

Microscopic Theory of Light-Induced Coherent Phonons Mediated by Quantum Geometry
Light-induced coherent phonons provide a powerful platform for ultrafast control of material properties. However, the microscopic theory and quantum geometric nature of this phenomenon remain underexplored. Here, we develop a fully quantum-mechanical framework based on Feynman diagrams to systematically describe the generation of coherent phonons by light. We identify a dominant second-order, double-resonant process in noncentrosymmetric semiconductors that efficiently couples light to both ele…

Primordial black hole induced gravitational waves in $f(R)$ gravity
Theodoros Papanikolaou, Salvatore Capozziello
https://arxiv.org/abs/2508.03939 https://…

Primordial black hole induced gravitational waves in $f(R)$ gravity
Ultra-light primordial black holes (PBHs) with masses $M_\mathrm{PBH}<5\times 10^{8}\mathrm{g}$ can trigger an early matter-dominated (eMD) era before Big Bang Nucleosynthesis (BBN) and reheat the Universe through their evaporation. Notably, the initial isocurvature in nature PBH energy density fluctuations can induce abundantly gravitational waves (GWs) due to second-order gravitational effects. In this work, we study this induced GW signal within the context of $f(R)$ gravity theories investi…

Linear and Second-order-cone Valid Inequalities for Problems with Storage
Juan M. Morales
https://arxiv.org/abs/2506.21470 https://ar…

Linear and Second-order-cone Valid Inequalities for Problems with Storage
Batteries are playing an increasingly central role as distributed energy resources in the shift toward power systems dominated by renewable energy sources. However, existing battery models must invariably rely on complementarity constraints to prevent simultaneous charging and discharging, rendering models of a disjunctive nature and NP-hard. In this paper, we analyze the disjunctive structure of the battery's feasible operational set and uncover a submodularity property in its extreme power tr…

Quantum nature of gravitational waves from binary black holes
Sugumi Kanno, Jiro Soda, Akira Taniguchi
https://arxiv.org/abs/2508.17947 https://arxiv.org/p…

Quantum nature of gravitational waves from binary black holes
Quantum mechanics is the fundamental framework of nature, and gravitational waves from binary black holes should likewise be analyzed quantum mechanically. It is commonly assumed that their classical description corresponds to a coherent state, so any deviation would signal genuinely quantum nature of gravity. We show that the coherent-state description reproduces classical gravitational waves at leading order, while next-order effects generate squeezed states of gravitons. For GW150914, we est…

Emerging Activity Temporal Hypergraph (EATH), a model for generating realistic time-varying hypergraphs
Marco Mancastroppa, Giulia Cencetti, Alain Barrat
https://arxiv.org/abs/2507.01124

Emerging Activity Temporal Hypergraph (EATH), a model for generating realistic time-varying hypergraphs
Time-varying group interactions constitute the building blocks of many complex systems. The framework of temporal hypergraphs makes it possible to represent them by taking into account the higher-order and temporal nature of the interactions. However, the corresponding datasets are often incomplete and/or limited in size and duration, and surrogate time-varying hypergraphs able to reproduce their statistical features constitute interesting substitutions, especially to understand how dynamical p…

Medium-range structural order in amorphous arsenic
Yuanbin Liu, Yuxing Zhou, Richard Ademuwagun, Luc Walterbos, Janine George, Stephen R. Elliott, Volker L. Deringer
https://arxiv.org/abs/2509.02484

Medium-range structural order in amorphous arsenic
Medium-range order (MRO) is a key structural feature of amorphous materials, but its origin and nature remain elusive. Here, we reveal the MRO in amorphous arsenic (a-As) using advanced atomistic simulations, based on machine-learned potentials derived using automated workflows. Our simulations accurately reproduce the experimental structure factor of a-As, especially the first sharp diffraction peak (FSDP), which is a signature of MRO. We compare and contrast the structure of a-As with that of…

Structure Preserving Finite Volume Schemes on Voronoi Grids: Curl Involution, Asymptotic Limit and Thermodynamics
Walter Boscheri, Firas Dhaouadi
https://arxiv.org/abs/2507.21351

Structure Preserving Finite Volume Schemes on Voronoi Grids: Curl Involution, Asymptotic Limit and Thermodynamics
We propose a new curl-free and thermodynamically compatible finite volume scheme on Voronoi grids to solve compressible heat conducting flows written in first-order hyperbolic form. The approach is based on the definition of compatible discrete curl-grad operators, exploiting the triangular nature of the dual mesh. We design a cell solver reminiscent of the nodal solvers used in Lagrangian schemes to discretize the evolution equation for the thermal impulse vector, and we demonstrate that the r…

Partial Floquet Transformation and Model Order Reduction of Linear Time-Periodic Systems
Sam Bender, Christopher Beattie
https://arxiv.org/abs/2508.00221 https://

Partial Floquet Transformation and Model Order Reduction of Linear Time-Periodic Systems
Time-periodic dynamical systems occur commonly both in nature and as engineered systems. Large-scale linear time-periodic dynamical systems, for example, may arise through linearization of a nonlinear system about a given periodic solution (possibly as a consequence of a baseline periodic forcing) with subsequent spatial discretization. The potential need to simulate responses to a wide variety of input profiles (viewed as perturbations off a baseline periodic forcing) creates a potent incentiv…

Topological magneto-optics in the non-coplanar antiferromagnet Co_{1/3}NbS_2: Imaging and writing chiral magnetic domains
E. Kirstein, H. Park, I. Martin, J. F. Mitchell, N. Ghimire, S. A. Crooker
https://arxiv.org/abs/2507.18829

Topological magneto-optics in the non-coplanar antiferromagnet Co_{1/3}NbS_2: Imaging and writing chiral magnetic domains
Despite its tiny net magnetization, the antiferromagnetic (AFM) van der Waals material Co$_{1/3}$NbS$_2$ exhibits a large transverse Hall conductivity $σ_{xy}$ even at zero applied magnetic field, which arises, as recently shown, from the topological nature of its non-coplanar ``tetrahedral'' AFM order. This triple-Q magnetic order can be regarded as the short-lengthscale limit of a magnetic skyrmion lattice, and has an intrinsic spin chirality. Here we show, using optical wavelengths spanning…

Gadget to realize arbitrary polarization transformation on a higher order Poincar\'e sphere
Sarvesh Bansal, P. Senthilkumaran
https://arxiv.org/abs/2508.19871 https://

Gadget to realize arbitrary polarization transformation on a higher order Poincaré sphere
Designing a single element for all polarization transformations on a Poincaré sphere is impossible due to practical limitations and hence a combination of few standard wave-plates are used to construct a gadget. With this gadget it is possible to realize a polarization transformation between any two points on the Poincaré sphere. There is no such gadget available to perform arbitrary polarization transformation on a higher order Poincaré sphere. We present one gadget here in which the nature…