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Physics

arXiv preprints from January 1, 2026 through September 5, 2026 — 04:19:06 EST

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Posted in astro-ph.GA · 2026-09-01 · Gairola Shashank, Smitha Subramanian, Shyam H. Menon, Chayan Mondal, Kathryn Grasha, Richard de Grijs, Prasun Dutta, Annapurni Subramaniam

Investigating the Young Stellar Populations and Hierarchies in Nearby Galaxies with the UVIT. III. Evidence for a Largest Scale of Correlated Stellar Structures and a Non-universal Fractal Dimension

Scale-free turbulent motions, gravitational collapse and galactic dynamics govern galactic-scale, hierarchical organization of star formation (SF) within galaxies. Past studies suggest that properties of SF hierarchies depend upon host galaxy properties and interstellar medium (ISM) conditions. To characterize SF hierarchies, we...

💬 0 commentsarXiv:2609.01065v1PDF
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Posted in gr-qc · 2026-09-01 · Kashif Ammar Yasir

Colored-Noise-Induced Horizon Fluctuations Near a Double Root in an Effective Black-Hole Geometry

Stress-tensor fluctuations carry information that is absent from the mean semiclassical Einstein equation, but their observable effect depends as much on the response of the geometry as on the noise itself. We formulate an effective, quasistationary spherical model organized by the response--noise structure of a quantum...

💬 0 commentsarXiv:2609.01063v1PDF
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Posted in physics.ao-ph · 2026-08-31 · Viviana Acquaviva, Romina Wild, Alessandro Laio, Amanda R. Fay, Thea H. Heimdal, Galen A. McKinley

How well is surface ocean carbon represented in observations and ocean models?

We introduce a general framework for quantifying the information content and representation quality of complex geophysical datasets based on the intrinsic dimension and differentiable information imbalance of data manifolds. We use it to derive and compare optimal representations of surface ocean carbon in the SOCAT database of...

💬 0 commentsarXiv:2609.00133v1PDF
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Posted in cond-mat.mes-hall · 2026-09-01 · Sai Shradha, Luc F. Oswald, Md Tarik Hossain, Lukas Krelle, Nicole Engel, Axel Printschler, Julian Führer, Honey Jayeshkumar Shah, Daria I. Markina, Kenji Watanabe, Takashi Taniguchi, Andrey Turchanin, Bernhard Urbaszek

Probing Nonlinear Interactions of Dipolar Interlayer Excitons in MoSe$_2$/WSe$_2$ Heterobilayers

Interlayer excitons in transition-metal dichalcogenide heterobilayers possess intrinsic out-of-plane dipole moments, providing a platform for investigating exciton-exciton interactions at high densities. Here, we use excitation-energy-dependent photoluminescence excitation (PLE) spectroscopy to probe the nonlinear response of dipolar...

💬 0 commentsarXiv:2609.01149v1PDF
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Posted in physics.optics · 2026-09-01 · Lukas Tenbrake, Daniel Stachanow, Florian Giefer, Jana Blechmann, Wolfgang Alt, Sebastian Hofferberth, Hannes Pfeifer

Direct laser-written optomechanical double membranes in an optical microcavity

Optomechanical membrane-in-the-middle systems that comprise several coupled compliant membranes offer enhanced optomechanical coupling and collective dynamics. Recent realizations were fundamentally restricted to two membranes and to limited structural optimization of the involved membranes due to their intricate fabrication and...

💬 0 commentsarXiv:2609.01145v1PDF
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Posted in physics.optics · 2026-09-01 · Zhijun Zhang, Xuejie Gao, Qiunan Li, Xiaoyu Mi

High-Speed and High-Responsivity Asymmetric Waveguide Photodiode with Low Optical Back-Reflection

We numerically demonstrate an asymmetric corner-reflector uni-traveling-carrier waveguide photodiode (UTC-WGPD) that simultaneously suppresses optical back-reflection and breaks the bandwidth-responsivity trade-off. Off-center beam coupling introduces geometric asymmetry to eliminate retroreflection while maintaining efficient light...

💬 0 commentsarXiv:2609.01138v1PDF
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Posted in cond-mat.quant-gas · 2026-09-01 · Juan Sánchez-Baena, Jordi Boronat

Quantum antidipolar systems in two-dimensional geometries

Particles with magnetic moment can be polarized, and rapidly rotated, employing a magnetic field such that the dipolar interaction among them changes sign, becoming antidipolar and thus isotropically attractive in a plane. Polar molecules can also be manipulated using microwave dressing fields to invert the sign of the dipole-dipole...

💬 0 commentsarXiv:2609.01137v1PDF
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Posted in gr-qc · 2026-09-01 · Bo-Xuan Ge

Relative-Phase Control of Common-Bridge Survival in Collisions of Radially Excited Boson Stars

We show that the relative phase primarily controls the survival, rather than the initial formation, of the common bridge in head-on collisions of radially excited boson stars. We vary the relative phase and track the post-contact bridge evolution across different boson-star configurations and scalar potentials. In the benchmark, all...

💬 0 commentsarXiv:2609.01134v1PDF
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Posted in physics.optics · 2026-09-01 · Jorge Parra

Design and Physical Constraints of Synthetic-Frequency Photonic Switching Fabrics

Electro-optic frequency conversion and synthetic-frequency coupling are established functions in integrated photonic devices. Their role within a multiport switching fabric, however, depends on how simultaneous optical connections share spatial paths, frequency channels, and device controls. Here, we investigate how coherent coupling...

💬 0 commentsarXiv:2609.01130v1PDF
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Posted in cond-mat.stat-mech · 2026-09-01 · Mintu Karmakar, Abhik Basu

Nonmonotonic control of pattern formation by chemotaxis

We investigate pattern formation in generic two-species reaction--diffusion systems with chemotaxis. We show that chemotaxis can give rise to a striking nonmonotonic dependence of pattern formation on its strength, opening the possibility of re-entrant transitions between patterned and homogeneous states controlled by chemotaxis. In...

💬 0 commentsarXiv:2609.01127v1PDF
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Posted in astro-ph.CO · 2026-09-01 · Aleksandra Dragović, Dominic Anstey, Harry T. J. Bevins, Eloy de Lera Acedo

Quantifying Sky Map Resolution Requirements for Beam Chromaticity Correction in Sky-Averaged 21 cm Experiments

The 21 cm hyperfine transition of neutral hydrogen provides one of the few direct probes of the early cosmic history. High-redshift detections of this signal could shine light on the poorly understood epochs of the Dark Ages and Cosmic Dawn, periods that remain among the least understood in the Universe's history. However, this signal...

💬 0 commentsarXiv:2609.01125v1PDF
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Posted in astro-ph.IM · 2026-08-31 · Elli Jobst, Lea Heckmann, Lukas Heinrich, David Paneque

The Analysis, not the Aperture: End-to-End Transformer Reconstruction for Imaging Atmospheric Cherenkov Telescopes

Imaging Atmospheric Cherenkov Telescopes (IACTs) detect very-high-energy gamma rays by imaging the nanosecond Cherenkov flash of the air shower they initiate in the Earth's atmosphere. For four decades the first steps of IACT event reconstruction have been essentially unchanged, relying on a heavy parameterisation and dimensionality...

💬 0 commentsarXiv:2608.31148v1PDF
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Posted in physics.optics · 2026-08-31 · Jiejun Zhang, Jianping Yao

Integrated Microwave Photonics: From Material Platforms to Systems-on-Chip

In this paper, recent advances in integrated microwave photonics (IMWP) are reviewed, including material platforms, integration technologies, and system functionalities. Emerging opportunities and future perspectives are discussed. Silicon (Si) and silicon nitride (SiN) provide dense routing, programmable filtering, and low-loss...

💬 0 commentsarXiv:2608.31146v1PDF
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Posted in astro-ph.GA · 2026-08-31 · Jennifer K. S. Friske, Filippo Fraternali, Gabriele Pezzulli

The impact of hot mode accretion and angular momentum conservation on metallicity gradients of galactic discs

The hot circumgalactic medium (CGM) of a galaxy inevitably rotates more slowly than the cold gas in the disc it surrounds, due to a higher pressure support against gravity. If it accretes vertically onto the disc, angular momentum conservation leads to radial flows, advection of metals inwards and the steepening of a metallicity...

💬 0 commentsarXiv:2608.31144v1PDF
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Posted in physics.flu-dyn · 2026-08-31 · Debashis Panda, Nicolas Périnet, Abdullah M. Abdal, Lyes Kahouadji, Seungwon Shin, Jalel Chergui, Damir Juric, Omar K. Matar, Laurette S. Tuckerman

Numerical simulation of a two-frequency-driven superlattice Faraday-wave pattern

The formation of a superlattice pattern in two-frequency-driven Faraday waves discovered and named SSS-I by Arbell & Fineberg (1998, 2002) is investigated by means of Direct Numerical Simulations (DNS) of the full three-dimensional Navier--Stokes equations with a free surface. Two simulations with distinct quasi-hexagonal initial...

💬 0 commentsarXiv:2608.31141v1PDF
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Posted in astro-ph.CO · 2026-08-31 · Y. Omori, W. L. K. Wu, Y. Nakato, F. Bianchini, L. Balkenhol, C. Daley, W. Quan, E. Anderes, A. J. Anderson, B. Ansarinejad, M. Archipley, D. R. Barron, P. S. Barry, K. Benabed, A. N. Bender, B. A. Benson, L. E. Bleem, S. Bocquet, F. R. Bouchet, E. Camphuis, M. G. Campitiello, J. E. Carlstrom, J. Carron, C. L. Chang, P. M. Chichura, A. Chokshi, T. -L. Chou, A. Coerver, T. M. Crawford, T. de Haan, K. R. Dibert, M. A. Dobbs, M. Doohan, D. Dutcher, C. Feng, K. R. Ferguson, N. C. Ferree, K. Fichman, A. Foster, S. Galli, A. E. Gambrel, A. K. Gao, F. Ge, F. Guidi, S. Guns, N. W. Halverson, E. Hivon, G. P. Holder, W. L. Holzapfel, J. C. Hood, A. Hryciuk, N. Huang, T. Jhaveri, F. Kéruzoré, A. R. Khalife, L. Knox, K. Kornoelje, C. -L. Kuo, K. Levy, Y. Li, A. E. Lowitz, C. Lu, G. P. Lynch, T. J. Maccarone, A. S. Maniyar, E. S. Martsen, F. Menanteau, M. Millea, J. Montgomery, T. Natoli, A. Ouellette, Z. Pan, P. Paschos, K. A. Phadke, A. W. Pollak, K. Prabhu, M. Rahimi, A. Rahlin, C. L. Reichardt, M. Rouble, J. E. Ruhl, A. C. Silva Oliveira, A. Simpson, J. A. Sobrin, A. A. Stark, J. Stephen, C. Tandoi, C. Trendafilova, J. D. Vieira, A. G. Vieregg, A. Vitrier, Y. Wan, N. Whitehorn, M. R. Young, J. A. Zebrowski

SPT-3G D1: Quadratic-Estimator CMB Lensing Reconstruction and Cosmology

We present a map of the cosmic microwave background (CMB) lensing potential reconstructed from observations taken during the 2019 and 2020 seasons with the third-generation camera on the South Pole Telescope (SPT), covering the $1500\,{\rm deg}^{2}$ SPT-3G Main field, referred to as the SPT-3G D1 dataset. From the multi-frequency...

💬 0 commentsarXiv:2608.31136v1PDF
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Posted in physics.ins-det · 2026-08-31 · Lucas Finazzi, Felipe Soriano, Leandro Gagliardi, Federico Golmar

FPGA-based TDC for SiPM Timing and Amplitude Measurements

Silicon photomultipliers (SiPMs) are widely used in photon-counting applications, such as positron emission tomography or particle physics, where precise timestamps and photoelectron number information are both required. In this work, a Time-to-Digital Converter with amplitude measurement capabilities was designed using an Artix-7...

💬 0 commentsarXiv:2608.31135v1PDF
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Posted in cond-mat.supr-con · 2026-08-31 · Anoop Dhillon, Amir Borji, Hamed Majedi

Microwave-Induced Optomagnetism in High-Temperature Superconductors

We report the first experimental observation of a steady-state, microwave-driven inverse Faraday effect in a high-temperature superconductor. Circularly polarized microwave radiation generates a helicity-dependent response in an epitaxial $\mathrm{YBa_2Cu_3O_{7-δ}}$ film, detected using homodyne Hall transport. The optomagnetic...

💬 0 commentsarXiv:2608.31127v1PDF
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Posted in hep-ph · 2026-08-31 · Sidney S. Avancini, Maximo Coppola, Dyana C. Duarte, Ricardo L. S. Farias, Norberto N. Scoccola, William R. Tavares

From Threshold Crossing to Wave-function Renormalization: Defining the Pion Mott Temperature in a Magnetic Field

We investigate the dissociation of the neutral pion in hot magnetized quark matter within the two-flavor Nambu--Jona-Lasinio model. At zero magnetic field, the Mott temperature is conventionally determined by $m_{π^0}(T_{\rm Mott})=2M(T_{\rm Mott})$, above which a real pole ceases to exist. At finite magnetic field, Landau...

💬 0 commentsarXiv:2608.31125v1PDF
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Posted in physics.ins-det · 2026-08-31 · S. A. Panamaldeniya, K. M. Dong, D. M. Mei

Development and characterization of a wingless ICPC HPGe detector with thin amorphous-Ge contacts

High-purity germanium (HPGe) detectors with thin amorphous-germanium (a-Ge) contacts can provide bipolar charge blocking and surface passivation while minimizing contact-related inactive thickness. We report the fabrication and characterization of a p-type inverted coaxial point-contact (ICPC) HPGe detector using thin a-Ge contacts in...

💬 0 commentsarXiv:2608.31123v1PDF
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Posted in cond-mat.stat-mech · 2026-08-31 · Gabriele Bandini, Giulio Biroli, Patrick Charbonneau, Andrea Gambassi

Overcoming critical slowing down in frustrated spin systems by learned multiscale sampling

Cluster algorithms, such as the Swendsen--Wang and Wolff methods, are among the most successful MCMC methods for mitigating critical slowing down in statistical systems. These constructive cluster algorithms, however, fail in the presence of even extremely weak frustration. Here, we sidestep this fundamental limitation by learning...

💬 0 commentsarXiv:2608.31114v1PDF
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Posted in astro-ph.SR · 2026-08-31 · Enzo Brasil, Cira E. G. Otiniano, Carolyne Brito, Beatriz Albernaz, Fidel Morales

Extremes of solar spectral irradiance in the SORCE/XPS record

Extreme and rare changes in space mission solar irradiance records are scientifically relevant but difficult to quantify because these records are finite, instrument dependent, and affected by observational gaps and time varying measurement quality. We evaluated extreme daily logarithmic changes in the band integrated 0.1-7.0 nm...

💬 0 commentsarXiv:2608.30878v1PDF
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Posted in physics.flu-dyn · 2026-08-30 · Sohel Ahmed, Nanda Poddar, Jyotirmoy Rana, Kajal Kumar Mondal, Niall Madden

Solute dispersion in magnetically influenced multiphase flow through a porous tube: axial transport and microrotational effects

This study presents a theoretical investigation of generalized solute dispersion in magnetohydrodynamic multiphase tube flow with porous layers. A two-fluid analytical model is developed for applications in biofluid and environmental fluid dynamics. The model comprises a micropolar (non-Newtonian) fluid core representing the...

💬 0 commentsarXiv:2608.29946v1PDF
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Posted in quant-ph · 2026-08-31 · Snehal Raj, Natansh Mathur, Alejandro Perdomo-Ortiz

"Train classical, deploy quantum" requires rethinking generalization

Generative models have become central across science and industry, from image and text synthesis to the design of molecules and materials. Quantum generative models are considered one of the most promising applications for quantum computers, since a quantum circuit naturally produces samples from the distribution it encodes, and for...

💬 0 commentsarXiv:2608.31117v1PDF
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Posted in quant-ph · 2026-08-31 · Andrea Coladangelo, Dakshita Khurana, Saachi Mutreja, Bhaskar Roberts, Joseph Slote, Avishay Tal

Unconditional Certified Randomness without Structure

We obtain a certified randomness protocol in the quantum random oracle model. The protocol is non-interactive and publicly verifiable with a classical verifier, and is based on Yamakawa and Zhandry's proof of quantumness [JACM'24]. We prove unconditional security of this protocol against adversaries making subexponentially-many...

💬 0 commentsarXiv:2608.31112v1PDF