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๐Ÿ” sam nelson ๐Ÿ“‚ Physics
Showing 16599 results for "sam nelson" in Physics
Physics Preprint PDF DOI

OAM-mode sorting with a wavefront twister

Suman Karan, Swati Chaudhary, Harshwardhan Wanare, Anand Kumar Jha ยท 2026

We propose an OAM sorter based on a novel optical element that we refer to as a wavefront twister. It is a generalization of the conventional wavefront rotators such as the Dove prism. However, unlikeโ€ฆ

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Physics Preprint PDF DOI

X-Ray Spectral Variability of the TeV HBL Blazar PG 1553+113 with XMM-Newton

P. U. Devanand, Alok C. Gupta, Paul J. Wiita, V. Jithesh, Archana Gupta ยท 2026

We present an extensive X-ray spectral variability study of the TeV photon-emitting high-energy-peaked BL Lacertae object PG 1553+113, using the data from EPIC-PN camera of XMM-Newton, which observed โ€ฆ

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Physics Preprint PDF DOI

Generalized Optical Theorem for Structured Neutron Beams and Consequences for Forward-Transmission Null Tests of Time-Reversal Invariance

Sepehr Samiei ยท 2026

The simple form of the optical theorem of scattering theory, $\sigma_{\rm tot}^{\rm pw} = (4\pi/k)\,\Im f(0)$, is valid for an incident plane wave or for a wave packet whose Fourier components possessโ€ฆ

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Physics Preprint PDF DOI

Unmasking Hidden Wigner's Symmetry from First Principles

Phong Dang, Daniel Langr, Tomas Dytrych, Jerry P. Draayer, David Kekejian ยท 2026

We present quantitative evidence that high-quality internucleon forces derived from $\chi$EFT exhibit a striking dominance of Wigner's supermultiplet symmetry, without invoking the large-$N_c$ limit oโ€ฆ

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Physics Preprint PDF DOI

Non-Equilibrium Orbital Transport in Terahertz Optorbitronics

Sobhan Subhra Mishra, Ranjan Singh ยท 2026

Modern information technologies rely on controlling the flow of electrons through their charge and spin. A rapidly emerging alternative is to use the orbital motion of electrons, the way they circulatโ€ฆ

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Physics Preprint PDF DOI

Newton-Cartan limit of Klein-Gordon AQFT and the collapse of Galilean modular structure

Leonardo A. Pachon ยท 2026

We extend the established Galilean/relativistic structural divider in algebraic quantum field theory, namely, the absence of Reeh-Schlieder and of Tomita-Takesaki modular flow on local algebras of anyโ€ฆ

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Determination of heavy meson light-cone distribution amplitudes: theoretical framework and lattice simulations

Hao-Fei Gao, Xue-Ying Han, Jun Hua, Xiangdong Ji, Xiangyu Jiang, Cai-Dian Lu, Andreas Schafer, Jin-XinTan, Ji-Hao Wang, Wei Wang, Ji Xu, Yi-Bo Yang, Fu-Wei Zhang, Jian-Hui Zhang, Jia-Lu Zhang, Mu-Hua Zhang, Qi-An Zhang, Shuai Zhao ยท 2026

We present a first-principles determination of heavy meson light-cone distribution amplitudes (LCDAs) from lattice QCD in the continuum limit, improving substantially on our previous pioneering study.โ€ฆ

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Physics Preprint PDF DOI

Axion-like particle-meson production in semileptonic $\tau$ decays

Yu-Xuan Bai, Jin Hao, Zhi-Hui Guo ยท 2026

In this work we explore the semileptonic $\tau$ decays into the axion-like particle ($a$)-meson final states within chiral effective field theory. The next-to-leading-order mixing matrix for the $\pi^โ€ฆ

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Physics Preprint PDF DOI

A study of $J/\psi$ mass shift and bound states: Impact of $D D$ and $DD^*$ meson loops

Manpreet Kaur, Arvind Kumar ยท 2026

We investigate the modification of the $J/\psi$ meson mass in asymmetric nuclear matter at zero and finite temperatures employing an effective Lagrangian approach that considers the contributions of $โ€ฆ

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Microscopic Theory of Chiral-Phonon-Induced Orbital Selectivity in Helical Crystals

Tomomi Tateishi, Akihito Kato, Alexander S. Ovchinnikov, Jun-ichiro Kishine ยท 2026

We present a microscopic theory of chirality-induced orbital selectivity (CIOS) in helical crystals, in which truly chiral phonons selectively transfer angular momentum to electronic orbital degrees oโ€ฆ

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A nonabelian Wilson surface on a lattice

Andreas Gustavsson ยท 2026

We analyze the nonabelian surface holonomy on a bipartite hypercubic lattice following a proposal in arXiv:1002.4636 [hep-th]. The bipartite structure of the lattice enables us to introduce spike striโ€ฆ

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Mass spectra of charged mesons and the quenching of vector meson condensation via exact phase-space diagonalization

Jingyi Chao, Kun Xu ยท 2026

We investigate the dynamics and mass spectra of charged pseudoscalar ($\pi^+$) and vector ($\rho^+$) mesons in a background magnetic field at finite temperature using the two-flavor Nambu-Jona--Lasiniโ€ฆ

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Role of heavy neutral lepton in lepton number violating $B$ meson decays

Dhiren Panda, Manas Kumar Mohapatra, Rukmani Mohanta ยท 2026

We study the phenomenology of heavy neutral leptons (HNLs) in $B$-meson decays as probes of physics beyond the Standard Model. Focusing on the leptonic channels $B \to \mu N$ and $B \to \tau N$, we coโ€ฆ

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Natural-orbital locking reveals hidden steady-state skin order in Gaussian open fermion chains

Y. T. Wang, X. Z. Zhang ยท 2026

Nonreciprocal relaxation matrices can have skin-localized right eigenmodes, but their imprint on a mixed steady state is not fixed by the density profile alone. We develop an exact steady-state theoryโ€ฆ

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Observation of OAM non-conservation in entangled photon generation

Suman Karan, Anand K. Jha ยท 2026

Orbital angular momentum (OAM)-entangled states produced by spontaneous parametric down-conversion (SPDC) are considered ideal for realizing high-dimensional entangled states, which have several advanโ€ฆ

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Hyperaccreting Neutron Stars inside Massive Envelopes: The Implausibility of Thorne-\.Zytkow Objects

Patrick Chi-Kit Cheong, David Radice, Christopher L. Fryer ยท 2026

The evolution of neutron stars (NSs) embedded within massive stellar envelopes is a critical phase in binary stellar evolution, potentially leading to the formation of Thorne-\.Zytkow Objects (T\.ZOs)โ€ฆ

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Matched asymptotics of Rayleigh-wave fields near cuspidal ridges and gorges

Oleg Kiselev ยท 2026

We construct a local matched-asymptotic description of time-harmonic elastic fields generated by Rayleigh waves near cuspidal elements of a traction-free surface. The free surface is represented localโ€ฆ

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Comparative analysis of nonlinear elastic moduli of polystyrene, polycarbonate and PMMA

A.V. Belashov, A.A. Zhikhoreva, Y.M. Beltukov, I.V. Semenova ยท 2026

We present the comparative experimental analysis of frequency dependencies of linear (Lam\'e) and nonlinear (Murnaghan) elastic moduli of polystyrene, PMMA and polycarbonate. The measurement methodoloโ€ฆ

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A graph-based Neural Network surrogate model for accelerating semi-analytical model of galaxy formation and evolution

Xuejie Li, Zhongxu Zhai, Xiaohu Yang, Andrew Benson, Yun Wang ยท 2026

Understanding how galaxy populations emerge and evolve from the growth of dark matter structure is a central challenge in galaxy formation theory. Semi-analytic models (SAMs) provide an efficient framโ€ฆ

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CCAT: Silicon-Platelet Feedhorns for Submillimeter Wavelengths

Jason Austermann, James Beall, James R. Burgoyne, Scott Chapman, Steve Choi, Cody J. Duell, Anthony I. Huber, Johannes Hubmayr, Matthew A. Koc, Michael D. Niemack, Joel N. Ullom, Jeffrey van Lanen, Anna Vaskuri, Michael Vissers, Jordan Wheeler ยท 2026

Silicon-platelet feedhorn arrays are an established technology at millimeter wavelengths that, for some applications, can provide significant advantages over traditional direct-machined metal feedhornโ€ฆ

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