A note on diffusive/random-walk behaviour in Metropolis--Hastings algorithms

This paper establishes that Metropolis–Hastings algorithms with non-geometrically ergodic proposals and high acceptance rates at large states fail to be geometrically ergodic, while further demonstrating that guided walk variants converge twice as fast as random walk versions for polynomial-tailed targets but exhibit similar ballistic speeds to random walks for strictly convex potentials.

Yuxin Liu, Peiyi Zhou, Samuel Livingstone2026-03-10🔢 math

Unconditional structure of Banach spaces with few operators

This paper demonstrates that the pp-convexification of Gowers' space G\mathbb{G} yields Banach spaces with unique unconditional bases containing block bases with spreading models distinct from 1\ell_1, 2\ell_2, and c0c_0, thereby resolving a long-standing open problem by Bourgain et al. and disproving the conjecture that such spaces must be isomorphic to their squares.

Fernando Albiac, Jose L. Ansorena2026-03-10🔢 math

Global well-posedness and inviscid limit of the compressible Navier-Stokes-Vlasov-Fokker-Planck system with density-dependent friction force

This paper establishes the global well-posedness, uniform-in-viscosity estimates, and optimal large-time decay rates for classical solutions to the three-dimensional compressible Navier-Stokes-Vlasov-Fokker-Planck system with density-dependent friction, thereby rigorously justifying the global inviscid limit and proving the first global existence of classical solutions for the corresponding Euler-Vlasov-Fokker-Planck system.

Fucai Li, Jinkai Ni, Dehua Wang2026-03-10🔢 math

Constrained zero-sum LQ differential games for jump-diffusion systems with regime switching and random coefficients

This paper establishes the open-loop solvability and derives a closed-loop representation for a cone-constrained two-player zero-sum stochastic linear-quadratic differential game involving jump-diffusion systems with regime switching and random coefficients, utilizing forward-backward stochastic differential equations and newly proposed multidimensional indefinite extended stochastic Riccati equations with jumps.

Yanyan Tang, Xu Li, Jie Xiong2026-03-10🔢 math