Clay weekly context brief for the Physics category (ISO week 2026-W46). 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. Solar Wind Classifications at Mars using Machine Learning Techniques Source: physics.space-ph (Space Physics) Link: https://arxiv.org/abs/2604.08710 Understanding solar wind variability throughout the heliosphere is essential for fundamental space physics and future exploration of the Moon and Mars. 2. Kinetic magnetohydrodynamics and Landau fluid closure in relativity Source: physics.plasm-ph (Plasma Physics) Link: https://arxiv.org/abs/2604.05058 Diffuse accretion flows near a supermassive black hole are fundamentally weakly collisional. 3. Reconciling advective upwelling with diapycnal downwelling: A transient kinematic perspective on Munk's conundrum Source: physics.geo-ph (Geophysics) Link: https://arxiv.org/abs/2502.21006 Bottom-intensified turbulent fluxes observed near the seafloor drive abyssal densification and diapycnal downwelling through their vertical divergence. 4. $\cal{PT}$-Symmetric GUP-Modified Single- and Double-Well Quartic Oscillators Source: physics.gen-ph (General Physics) Link: https://arxiv.org/abs/2611.08530 We study the GUP-deformed quartic oscillator $H_\eta=p^2+\eta p^4+x^4$ and distinguish its real-axis realization from complex-contour realizations. 5. Implementation and verification of a new free boundary module for Resistive Wall Modes simulations with the nonlinear 3D full MHD code SpeCyl Source: physics.comp-ph (Computational Physics) Link: https://arxiv.org/abs/2610.13428 Self-consistent numerical simulations of free boundary instabilities, such as resistive wall modes (RWMs) and external kink modes, require special attention given their relevance on the path towards magnetic fusion based nuclear reactors. 6. Controlled spin-torque driven domain wall motion using staggered magnetic nanowires Source: physics.app-ph (Applied Physics) Link: https://arxiv.org/abs/1908.09304 The growing demand for storage, due to big data applications, cannot be met by hard disk drives. 7. Portable Glass-RPC Telescope for Muography and Future Applications at Laser Wake Field Accelerators Source: physics.acc-ph (Accelerator Physics) Link: https://arxiv.org/abs/2611.09541 We report a 2025 beam test at ELBA, the multi-GeV laser wakefield accelerator at ELI Beamlines, using a Resistive Plate Chamber (RPC) telescope with an active area of 16 * 16 cm2. 8. Successive Decimetric Bursts Associated with Breakout Magnetic Reconnection during the Decay Phase of an M-Class Flare Source: physics.space-ph (Space Physics) Link: https://arxiv.org/abs/2611.09332 Radio imaging spectroscopy diagnoses coronal electron acceleration and propagation by tracking energetic electron beams and locating energy-release sites. 9. Global Magnetohydrodynamic Simulations of Monster Shocks in Neutron Star Magnetospheres Source: physics.plasm-ph (Plasma Physics) Link: https://arxiv.org/abs/2602.21290 Waves launched from the neutron star surface or inner magnetosphere propagate through the magnetosphere as small perturbations, but can grow relative to the background magnetic field and steepen into ``monster shocks'' -- ultra-relativistic magnetized shocks which can power high-energy emission. 10. How balloons lose their charge by collecting ions from the air Source: physics.gen-ph (General Physics) Link: https://arxiv.org/abs/2611.08521 The air we breathe contains radioactive particles. 11. Kerr Quasinormal Modes without Variable Separation: A Two-Dimensional Hyperboloidal Teukolsky Solver with Physics-Informed Neural Networks Source: physics.comp-ph (Computational Physics) Link: https://arxiv.org/abs/2608.19774 We use physics-informed neural networks (PINNs) to solve the gravitational quasinormal-mode (QNM) eigenvalue problem for Kerr spacetime directly in the two-dimensional hyperboloidal formulation of the Teukolsky equation. 12. Inversion symmetry breaking by interlayer hybridization in a tetralayer van der Waals heterostructure Source: physics.app-ph (Applied Physics) Link: https://arxiv.org/abs/2611.09669 Inversion symmetry breaking unlocks a broad range of physical phenomena fundamental for modern technologies, motivating efforts to engineer noncentrosymmetric materials. 13. Secondary neutron beam production at Jefferson Lab Source: physics.acc-ph (Accelerator Physics) Link: https://arxiv.org/abs/2611.09525 We investigate secondary neutron production by an 11 GeV electron beam in the Hall A beam dump at Jefferson Lab and their transport to a downstream experimental area. 14. Stabilization of counter propagating currents by energy conservation in collisions Source: physics.plasm-ph (Plasma Physics) Link: https://arxiv.org/abs/2610.41748 Current filamentation generates magnetic fields and shapes electron transport in dense plasmas, where collisions can either suppress or enhance its growth. 15. Physics Steering: Causal Control of Cross-Domain Concepts in a Physics Foundation Model Source: physics.comp-ph (Computational Physics) Link: https://arxiv.org/abs/2511.20798 Foundation models trained on text and images have been shown to develop abstract internal features that align with human concepts and that can be directly manipulated via activation steering to alter model behaviour. 16. Layer-Peeling Inversion of Temporal Refractive Index Profiles from Noisy Data Source: physics.app-ph (Applied Physics) Link: https://arxiv.org/abs/2611.09630 We introduce a direct method for reconstructing the temporal evolution of a medium from electromagnetic field measurements. Sources in this brief: physics.acc-ph (Accelerator Physics); physics.app-ph (Applied Physics); physics.comp-ph (Computational Physics); physics.gen-ph (General Physics); physics.geo-ph (Geophysics); physics.plasm-ph (Plasma Physics); physics.space-ph (Space Physics). Selected 16 of 29 available items for this weekly brief.