Non-Monotone Traveling Waves of the Weak Competition Lotka-Volterra System

This paper establishes the existence of traveling wave solutions, including non-monotone waves and front-pulse waves, for the two-species weak competition Lotka-Volterra system across all wave speeds sss \geq s^*, with a rigorous proof for the critical speed case and the first-time demonstration of front-pulse waves in the critical weak competition regime.

Chiun-Chuan Chen, Ting-Yang Hsiao, Shun-Chieh WangMon, 09 Ma🔢 math

Equi-integrable approximation of Sobolev mappings between manifolds

This paper establishes that limits of sequences of smooth maps between compact Riemannian manifolds with equi-integrable W1,pW^{1, p}-Sobolev energy can always be strongly approximated by smooth maps, thereby extending Hang's density result to integer p2p \ge 2 and providing proofs for higher-order and fractional Sobolev spaces as well as cases governed by the Bethuel-Demengel-Colon-Hélein cohomological criterion.

Jean Van SchaftingenMon, 09 Ma🔢 math

On the defocusing stationary nonlinear Schrödinger equation on metric graphs

This paper investigates the existence, stability, and multiplicity of ground states and stationary solutions for the defocusing nonlinear Schrödinger equation on noncompact metric graphs, establishing that while small masses always yield stable ground states, large masses lead to non-existence in the subcritical regime, with specific sharp thresholds and bifurcation behaviors identified under δ\delta-type vertex conditions.

Élio Durand-Simonnet, Damien Galant, Boris ShakarovMon, 09 Ma🔢 math

Ground States of Attractive Fermi Schrödinger Systems with Ring-Shaped Potentials

This paper establishes the existence and nonexistence of ground states for mass-critical N-coupled attractive Fermi nonlinear Schrödinger systems in ring-shaped potentials based on the strength of interactions relative to a critical constant derived from a finite-rank Lieb-Thirring inequality, while also characterizing the mass concentration behavior of these states as the interaction strength approaches this critical threshold.

Yujin Guo, Yan Li, Shuang WuMon, 09 Ma🔢 math

Qualitative properties of the fractional magnetic pp-Laplacian and applications to critical quasilinear problems

This paper establishes the functional framework and existence of weak solutions for quasilinear equations involving the fractional magnetic pp-Laplacian in three dimensions by employing variational methods and introducing a novel concentration compactness principle to address challenges posed by nonlocality, magnetic potentials, and critical nonlinearities.

Laura Baldelli, Federico BerniniMon, 09 Ma🔢 math

Rubio de Francia Extrapolation Theorem for Quasi non-increasing Sequences

This paper establishes the discrete Rubio de Francia extrapolation theorem for pairs of quasi non-increasing sequences with QBβ,p\mathcal{QB}_{\beta, p} weights and provides a weight characterization for the boundedness of the generalized discrete Hardy averaging operator on such sequences within the space lwp(Z+)l_w^p(\mathbb{Z}^+).

Monika Singh, Amiran Gogatishvili, Rahul Panchal, Arun Pal SinghMon, 09 Ma🔢 math

Learning Where the Physics Is: Probabilistic Adaptive Sampling for Stiff PDEs

The paper introduces GMM-PIELM, a probabilistic adaptive sampling framework that significantly improves the accuracy and conditioning of Physics-Informed Extreme Learning Machines for stiff PDEs by autonomously concentrating basis function centers in high-error regions like shock fronts, achieving orders-of-magnitude lower errors than baseline methods while retaining rapid closed-form training speeds.

Akshay Govind Srinivasan, Balaji SrinivasanMon, 09 Ma🤖 cs.AI