Clay weekly context brief for the Physics category (ISO week 2026-W37). Clay tracks publications from the Physics feed list. Below are recent items from this category, each with its source and a short description of what the publication covers when one is available in the source feed. Recent publications: 1. Dependence of self-injected bunch parameters on the plasma density gradient and laser pulse amplitude at LWFA in a conical plasma channel Source: physics.acc-ph (Accelerator Physics) Link: https://arxiv.org/abs/2609.03479 Laser wakefield acceleration (LWFA) is an advanced method of high gradient acceleration of charged particles with wakefield excited in plasma by laser pulse. 2. Added value of dynamical downscaling in sub-seasonal tropical cyclone forecast Source: physics.ao-ph (Atmospheric and Oceanic Physics) Link: https://arxiv.org/abs/2609.03364 Improving the sub-seasonal forecast of tropical cyclones (TCs) remains a significant challenge for climate models. 3. Revealing Magnon-Photon Coupling in Ultrathin Magnetic Films Using the Derivative-Divide Method Source: physics.app-ph (Applied Physics) Link: https://arxiv.org/abs/2603.10770 Magnon-photon coupling in planar cavities provides a promising platform for integrated cavity magnonics devices. 4. Magnetic Dipole Hyperfine Constants of 15 Energy Levels in $^{169}$Tm II Determined by Collinear Laser Fluorescence Spectroscopy Source: physics.atom-ph (Atomic Physics) Link: https://arxiv.org/abs/2609.03997 We present measurements of the hyperfine structure, transition frequencies and relative intensities in 14 lines of 169Tm+ ions starting from the $4f^{13}({}^2\!F^o_{7/2})6s_{1/2} (7/2, 1/2)_{3,4}^o$ levels. 5. Molecular Transferability of a Noble-Gas Coordinate for Electronegativity Equalization Source: physics.chem-ph (Chemical Physics) Link: https://arxiv.org/abs/2609.02930 Charge-equilibration models predict how electrons redistribute over a molecule more cheaply than quantum chemistry, and each begins from a table of atomic electronegativities and hardnesses. 6. The Schwitters Memorial Problem: A Car Speeds Across a Triangular Bump Source: physics.class-ph (Classical Physics) Link: https://arxiv.org/abs/2609.02938 Most drivers slow down for speed bumps, sometimes to almost a stop, as if each speed bump were a stop or yield sign. 7. Reduced latent leakage does not reliably predict lower likelihood bias in collider inference Source: physics.data-an (Data Analysis, Statistics and Probability) Link: https://arxiv.org/abs/2609.03599 Reusable collider representations can be evaluated through downstream discrimination and probes of retained information, but neither quantity directly tests the behaviour of score templates in a profiled likelihood. 8. Signatures of an Entangled Graviton Duet Source: physics.gen-ph (General Physics) Link: https://arxiv.org/abs/2609.02903 With the detection of the Higgs boson, the standard model is an almost complete theory. 9. Cavity Ring-Down Spectroscopy at Benchmark-Level Sub-Permille Accuracy Enabled by a System-Level Detection Transfer Function Source: physics.ins-det (Instrumentation and Detectors) Link: https://arxiv.org/abs/2609.04027 Cavity ring-down spectroscopy (CRDS) is widely used for sensitive optical absorption measurements, but its quantitative accuracy can be limited at the few-percent level by systematic distortions originating in the CRDS detection system, particularly at short ring-down times. 10. Improving Clinical Target Volume Segmentation Accuracy using Anatomical Priors and Active Learning for the AGITG TOPGEAR Clinical Trial Source: physics.med-ph (Medical Physics) Link: https://arxiv.org/abs/2609.03186 Training deep learning-based medical image segmentation models is challenging with limited curated datasets. 11. A Silicon-Compatible Uncooled Compact Broadband Infrared Spectrometer Source: physics.optics (Optics) Link: https://arxiv.org/abs/2609.03284 Infrared spectroscopy is a widely used technique for molecular identification, yet its widespread deployment remains constrained by bulky instrumentation, cryogenic cooling requirements, and limited portability. 12. Hall-MHD in driven turbulence FLASH simulations Source: physics.plasm-ph (Plasma Physics) Link: https://arxiv.org/abs/2609.03183 The origin of magnetic fields in turbulent astrophysical systems has long been a central problem in plasma astrophysics. 13. ESRIcascade.jl: A Julia package for fast computation of the Economic Systemic Risk Index Source: physics.soc-ph (Physics and Society) Link: https://arxiv.org/abs/2609.03782 This work presents ESRIcascade.jl, a Julia package for computing the Economic Systemic Risk Index (ESRI). 14. Analysis of Moment Closures Using $\varphi$-Divergences for Rarefied Dynamics with Binary Collisions and Their Galerkin Discretizations Source: physics.flu-dyn (Fluid Dynamics) Link: https://arxiv.org/abs/2608.03640 This work introduces a robust deterministic framework for approximating solutions of the Boltzmann equation with binary collisions by discretizing their dependence on time, position, and velocity using Galerkin methods. 15. The Whittaker-Maxwell Scaffolding. Scaffolding or template: what remains of a model when it is removed Source: physics.hist-ph (History and Philosophy of Physics) Link: https://arxiv.org/abs/2609.02949 This paper discusses the metaphor, originating with Whittaker, according to which Maxwell's model of molecular vortices was the scaffolding by means of which the equations of electromagnetism were erected, removed afterwards without consequence for the building. 16. 3D hybrid cellular Potts model with a discrete deformable fiber network: modeling cell contraction and extracellular matrix remodeling Source: physics.bio-ph (Biological Physics) Link: https://arxiv.org/abs/2609.02375 The extracellular matrix (ECM) is a fibrous and dynamic network that plays a critical role in development, homeostasis, and disease. 17. Seismic quiescence and activation prior to the 2025 M8.8 Kamchatka, Russia earthquake Source: physics.geo-ph (Geophysics) Link: https://arxiv.org/abs/2511.10750 The 2025 M8.8 Kamchatka earthquake in the Kamchatka-Kuril subduction system provides a unique opportunity to investigate the preparatory processes of a great subduction event. 18. Rigorously justified local time stepping in the unified gas-kinetic wave-particle method for steady multiscale flow simulation Source: physics.comp-ph (Computational Physics) Link: https://arxiv.org/abs/2607.09552 Local time stepping (LTS) can accelerate convergence to steady states in kinetic simulations with large variations in the local time steps across the computational domain. 19. The resource cost of magic in a code block Source: quant-ph (Quantum Physics) Link: https://arxiv.org/abs/2608.29438 We bound the magic of a post-selected logical measurement by the resource that produced it. 20. Photoemission from Semi-Infinite Crystals: First-Principles Scattering States and Quantitative Ag(111) Validation Source: physics.acc-ph (Accelerator Physics) Link: https://arxiv.org/abs/2607.19551 Photoemission is an escape problem, yet first-principles calculations usually trap the electron in a periodic box. 21. Radiative and Dynamical Controls on the Land-Ocean Warming Contrast in Climate Models Source: physics.ao-ph (Atmospheric and Oceanic Physics) Link: https://arxiv.org/abs/2609.03658 Surface air over land warms substantially more than over the ocean under greenhouse forcing, a phenomenon known as the land-ocean warming contrast. 22. Articulatory movements influence electromagnetic wave transmission through the vocal tract Source: physics.app-ph (Applied Physics) Link: https://arxiv.org/abs/2604.19362 This study experimentally validates a numerical model of electromagnetic propagation through the human head during the pronunciation of different vowels, with the goal of improving our understanding of the underlying physical phenomena. 23. Sub-barrier peaks in atom-atom-ion three-body recombination Source: physics.atom-ph (Atomic Physics) Link: https://arxiv.org/abs/2609.04106 Hybrid atom-ion experiments have recently entered the few-partial wave regime in which magnetically tunable Feshbach resonances dominate the three-body loss dynamics. 24. Enumerating Chemical Structures, Stereoisomers, and Stereogenic Units with Analytic Combinatorics Source: physics.chem-ph (Chemical Physics) Link: https://arxiv.org/abs/2609.02932 The enumeration of chemical structures traditionally relies on graph- and group-theoretic techniques, including P\'olya theory, in order to account for stereochemical symmetries. 25. Wave physics as a choreographic notation for partner dance Source: physics.class-ph (Classical Physics) Link: https://arxiv.org/abs/2604.21918 The wave is considered a paradigm in dance and connects bodily expression with nature. 26. Oscillating Heat Transfer Prediction in Porous Structures Using Generative AI-Assisted Explainable Machine Learning Source: physics.data-an (Data Analysis, Statistics and Probability) Link: https://arxiv.org/abs/2509.11863 Predicting and interpreting thermal performance under oscillating flow in porous structures remains a critical challenge due to the complex coupling between fluid dynamics and geometric features. 27. Time-of-flight fuzziness from deformed relativistic symmetries Source: physics.gen-ph (General Physics) Link: https://arxiv.org/abs/2609.02904 A general expectation in quantum gravity is that quantum properties of spacetime manifest themselves as fuzziness, causing an irreducible uncertainty in the measurement of spacetime-related observables. 28. FPGA Implementation of a CNN-based Topological Trigger for HL-LHC Source: physics.ins-det (Instrumentation and Detectors) Link: https://arxiv.org/abs/2503.09428 The implementation of convolutional neural networks in programmable logic, for applications in fast online event selection at hadron colliders, is studied. 29. Fast Patient-Specific Breast CT Dosimetry: 22-Fold Acceleration of Monte Carlo MGD Estimation Source: physics.med-ph (Medical Physics) Link: https://arxiv.org/abs/2609.03263 Accurate patient-specific mean glandular dose (MGD) estimation in breast computed tomography (BCT) requires anatomically realistic models, but high-resolution patient-derived phantoms impose high computational demands on Monte Carlo (MC) dosimetry. 30. Machine learning-assisted design and explainable optimization of CdSnP2-based integrated solar-photodetector devices Source: physics.optics (Optics) Link: https://arxiv.org/abs/2609.03642 CdSnP2-based integrated solar cell-photodetector (SC-PD) devices employing CdS and CuGaSe2 (CGS) as the window and back surface field (BSF) layers, respectively are investigated using a hybrid machine learning (ML)-assisted SCAPS-1D framework. 31. Minute-Scale High-Fidelity Gyrokinetic Simulations with Portability from Laptop to Supercomputer Source: physics.plasm-ph (Plasma Physics) Link: https://arxiv.org/abs/2609.03354 Global gyrokinetic particle simulations remain computationally expensive, as they demand both adequate marker statistics and three-dimensional field solvers. 32. Design Principles for Reproducible Networks Source: physics.soc-ph (Physics and Society) Link: https://arxiv.org/abs/2609.03852 From protein complexes to electronic circuits, many natural and engineered systems function only if assembled in an exact, reproducible fashion. Sources in this brief: physics.acc-ph (Accelerator Physics); physics.ao-ph (Atmospheric and Oceanic Physics); physics.app-ph (Applied Physics); physics.atom-ph (Atomic Physics); physics.bio-ph (Biological Physics); physics.chem-ph (Chemical Physics); physics.class-ph (Classical Physics); physics.comp-ph (Computational Physics); physics.data-an (Data Analysis, Statistics and Probability); physics.flu-dyn (Fluid Dynamics); physics.gen-ph (General Physics); physics.geo-ph (Geophysics); physics.hist-ph (History and Philosophy of Physics); physics.ins-det (Instrumentation and Detectors); physics.med-ph (Medical Physics); physics.optics (Optics); physics.plasm-ph (Plasma Physics); physics.soc-ph (Physics and Society); quant-ph (Quantum Physics). Selected 32 of 406 available items for this weekly brief.