Lorentzian-Euclidean singularity-free solutions to gravitational collapse

This paper proposes a singularity-free model of gravitational collapse that replaces the standard Schwarzschild interior with a geometry supported by a cosmological-constant-like stress-energy tensor and a Higgs-like scalar field, resulting in a new theoretical mass-radius limit of M/R=3/8M/R=3/8 while violating the local Principle of Equivalence through a metric sign change across the horizon.

Sune Rastad Bahn, Michael Cramer Andersen2026-03-05🔬 physics

Effects of neoclassical toroidal viscosity on plasma flow evolution in the presence of resonant magnetic perturbation in a tokamak

Using a cylindrical theory model, this study demonstrates that while neoclassical toroidal viscosity (NTV) has negligible impact on plasma flow at the resonant surface, it significantly alters core rotation profiles and, in conjunction with electromagnetic torque under non-uniform pressure conditions, helps maintain the locked mode state.

Fangyuan Ma, Ping Zhu, Jiaxing Liu2026-03-05🔬 physics

First Experimental Characterization of Plasma Parameters and Carbon Decontamination Rates in a Microwave Resonator Used in Particle Accelerators

This study presents the first experimental characterization of plasma parameters and carbon decontamination rates in microwave resonators used for particle accelerators, utilizing Langmuir probes and quartz crystal microbalances to optimize the in-situ plasma cleaning of superconducting radio frequency cavities.

Camille Cheney, Gabriel Abi-abboud, Stéphane Béchu + 7 more2026-03-05🔬 physics

Electric current dynamics in the stellarator coil winding surface model

This paper establishes a theoretical framework for stellarator coil winding surfaces that proves a dichotomy principle for current distributions on toroidal shapes and demonstrates that oppositely oriented currents on piecewise cylindrical surfaces generate center and saddle point regions with predominantly periodic field lines, offering key insights for optimizing coil design.

Wadim Gerner, Anouk Nicolopoulos-Salle, Diego Pereira Botelho2026-03-05🔬 physics

Scattering of kinks in Frankensteinian potentials: Kinks as bubbles of exotic mass and phase transitions in oscillon production

This paper investigates kink-anti-kink scattering in piece-wise quadratic-linear "Frankensteinian" potentials, proposing an interpretation of these models as free massive theories with threshold-driven pair production and demonstrating a phase-transition-like shift from wave disintegration to oscillon formation based on field thresholds and initial velocities.

Lukáš Rafaj, Ondřej Nicolas Karpíšek, Filip Blaschke2026-03-05🔬 physics

Optimally Tuned Multiconfigurational Short-Range DFT for Linear Response Properties

This paper introduces an optimal-tuning scheme for multiconfigurational short-range density functional theory (MC-srDFT) that determines the system-specific range-separation parameter via the ionization potential derived from Extended Koopmans' Theorem, significantly improving the accuracy of static and dynamic dipole polarizabilities compared to standard universal parameters.

Michał Hapka, Katarzyna Pernal, Ewa Pastorczak2026-03-05🔬 physics

An analytical-numerical coupled model of liquid droplet impact on solid material surfaces

This study presents an analytical-numerical coupled model that combines a closed-form analytical solution for droplet impact pressure with finite-element simulations of solid response, achieving over 97% computational cost reduction compared to traditional SPH methods while accurately predicting erosion-relevant quantities like peak pressure and impact force.

Hao Hao, Maria N. Charalambides, Yannis Hardalupas + 2 more2026-03-05🔬 physics