Clay weekly context brief for the Physics category (ISO week 2026-W41).

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. Well-posedness of regular solutions for 3-D full compressible Navier-Stokes equations with degenerate viscosities and heat conductivity
   Source: physics.flu-dyn (Fluid Dynamics)
   Link: https://arxiv.org/abs/2307.06609
   For the degenerate viscous and heat conductive compressible fluids, the momentum equations and the energy equation are degenerate both in the time evolution and spatial dissipation when vacuum appears, and then the physical entropy S behaves singularly, which make it challenging to study the corresponding existence of regular solutions with high order regularities of S near the vacuum.
2. Orbital-Rotation Shadow Tomography Reduces the Classical Cost of Quantum-Classical Auxiliary-Field Quantum Monte Carlo
   Source: quant-ph (Quantum Physics)
   Link: https://arxiv.org/abs/2610.03103
   Quantum-classical auxiliary-field quantum Monte Carlo (QC-AFQMC) is a promising route to using quantum computers for strongly correlated electronic structure problems, but its scalability is limited by a classical post-processing bottleneck: the measured quantum trial state must be used to evaluate overlaps, force biases, and local energies for many walkers throughout the AFQMC propagation.
3. Fail-closed conformal multiresolution error control for conservative three-dimensional dose remapping in synthetic phantoms
   Source: physics.med-ph (Medical Physics)
   Link: https://arxiv.org/abs/2609.13621
   Conservative dose remapping can be formulated by transporting mass and deposited energy across nonmatching grids, but fixed sampling uses the same number of points per active source cell regardless of case difficulty.
4. Development of Small-pitch, Ultra-thin 3D Silicon Sensors at USTC
   Source: physics.ins-det (Instrumentation and Detectors)
   Link: https://arxiv.org/abs/2605.13281
   We report on the development of 3D silicon sensors at the University of Science and Technology of China (USTC).
5. Acceleration methods for the planar 3D ILSA hydraulic fracturing model
   Source: physics.geo-ph (Geophysics)
   Link: https://arxiv.org/abs/2606.20025
   Planar 3D models of hydraulic fracturing provide a practical balance between models with restrictive geometric assumptions and fully 3D simulators, capturing fractures with arbitrary planar footprints at moderate computational cost.
6. Stochastic Optimization of Tree Tensor Networks
   Source: physics.comp-ph (Computational Physics)
   Link: https://arxiv.org/abs/2609.00870
   Tensor networks, originally developed for quantum many-body physics, are promising models for machine learning.
7. Using large language models to probe the limits of atom-centered structural descriptors
   Source: physics.chem-ph (Chemical Physics)
   Link: https://arxiv.org/abs/2607.26984
   Mapping an atomic structure to a compact set of geometric descriptors is an essential step in any machine-learning application to atomic-scale modeling.
8. Simultaneous Detection, Demodulation, and Angle-of-Arrival Determination of Communication Signals Using a Dual Ladder Rydberg Receiver
   Source: physics.app-ph (Applied Physics)
   Link: https://arxiv.org/abs/2603.00297
   In a typical Rydberg mixer, modulated communication signals are detected using a radio frequency (RF) heterodyne technique.
9. Baseline Climatology of Tornadoes and Waterspouts in the Philippine Archipelago
   Source: physics.ao-ph (Atmospheric and Oceanic Physics)
   Link: https://arxiv.org/abs/2609.01692
   Tornadoes are documented on every inhabited continent, yet the environmental conditions used to anticipate them were developed and validated overwhelmingly on mid-latitude records, leaving tropical regimes largely unexamined.
10. Parity-Time Symmetry of Plasma Waves
   Source: physics.plasm-ph (Plasma Physics)
   Link: https://arxiv.org/abs/2610.03433
   The susceptibility tensor of a homogeneous collisionless magnetized plasma possesses parity-time (PT) symmetry.
11. Active learning of collinear magnetic Moment Tensor Potentials using the spin-MLIP package from soft-constrained spin-polarized DFT calculations: a case study
   Source: physics.atom-ph (Atomic Physics)
   Link: https://arxiv.org/abs/2605.26897
   Explicit incorporation of magnetic degrees of freedom in machine-learning interatomic potentials (magnetic MLIPs) plays a crucial role in the correct description of magnetic materials and their properties.
12. High-Field Brightness Limits of Alkali-Antimonide Photocathodes
   Source: physics.acc-ph (Accelerator Physics)
   Link: https://arxiv.org/abs/2610.01398
   Pushing the brightness limit of electron sources requires simultaneously minimizing the intrinsic emittance and maximizing the accelerating field.
13. A Zero-Flux Material Cylinder in the Unsteady Kiknadze--Krasnov Vortex
   Source: physics.flu-dyn (Fluid Dynamics)
   Link: https://arxiv.org/abs/2610.00082
   In viscous flow, the circulation enclosed by a deterministic material loop generally changes through vorticity diffusion.
14. Analytical controls for dispersive multi-qubit interactions in mediator-coupled quantum registers
   Source: quant-ph (Quantum Physics)
   Link: https://arxiv.org/abs/2610.03064
   Fast control of long-lived quantum registers often relies on an auxiliary degree of freedom, a mediator, but real mediator excitation can introduce decoherence, leakage, or loss when the mediator is not the coherence-optimized component.
15. Diffusion broadening of the point spread function in steady-state MRI
   Source: physics.med-ph (Medical Physics)
   Link: https://arxiv.org/abs/2610.02132
   Purpose: To demonstrate how diffusion blurs the longitudinal magnetization in steady-state gradient-echo imaging, quantify resolution dependence on flip angle and repetition time, and the effects on relaxometry at microscopic resolution.
16. NeutronGym: Physics-Graded Neutron Instrument Design for LLM Agents
   Source: physics.ins-det (Instrumentation and Detectors)
   Link: https://arxiv.org/abs/2610.03631
   Designing a scientific instrument tests whether language-model agents can do physics rather than recall it, provided the grading cannot be argued with.
17. Spatially Organized Hillslope Weakening Localizes Retrogressive Thaw Slumps across the Tibetan Plateau
   Source: physics.geo-ph (Geophysics)
   Link: https://arxiv.org/abs/2610.03046
   Long-term permafrost warming on the Tibetan Plateau is continuously and broadly reshaping cold-region landscapes, and has produced numerous localized and clustered retrogressive thaw slumps (RTSs).
18. Reduced-order topology optimization of defect spectra in phononic crystals
   Source: physics.comp-ph (Computational Physics)
   Link: https://arxiv.org/abs/2605.26435
   Defect modes localize vibrations within phononic-crystal bandgaps.
19. Pathway-resolved analysis of internal conversion enabled by Gaussian boson sampling
   Source: physics.chem-ph (Chemical Physics)
   Link: https://arxiv.org/abs/2610.03271
   Gaussian Boson Sampling (GBS) has provided strong evidence of quantum advantage, motivating the search for real-world applications.
20. Inverse-Designed Photonic Crystal Cavities with Controllable Far-Field Numerical Aperture
   Source: physics.app-ph (Applied Physics)
   Link: https://arxiv.org/abs/2509.16827
   Photonic crystal cavities confine light to subwavelength volumes, enabling strong light-matter interactions for applications in low-power photonics, optoelectronics, nonlinear optics, and quantum information.
21. DAWIS: Data Assimilation with Windowed Inverse Sampling via Multitask Interpolants
   Source: physics.ao-ph (Atmospheric and Oceanic Physics)
   Link: https://arxiv.org/abs/2610.03314
   Flow- and diffusion-based generative models have recently emerged as flexible and highly efficient forecasting models for dynamical systems.

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.chem-ph (Chemical Physics); physics.comp-ph (Computational Physics); physics.flu-dyn (Fluid Dynamics); physics.geo-ph (Geophysics); physics.ins-det (Instrumentation and Detectors); physics.med-ph (Medical Physics); physics.plasm-ph (Plasma Physics); quant-ph (Quantum Physics).
Selected 21 of 88 available items for this weekly brief.