Mathematical physics sits at the fascinating intersection where abstract equations meet the fundamental laws of our universe. This field uses rigorous mathematical tools to model everything from the behavior of subatomic particles to the curvature of spacetime, turning complex theories into testable predictions. It is the language through which physicists describe reality, bridging the gap between pure mathematics and physical observation.

On Gist.Science, we process every new preprint published in this category on arXiv to make these dense studies accessible to everyone. Whether you are a specialist or a curious reader, you will find both plain-language overviews and detailed technical summaries for each paper. Below are the latest mathematical physics papers from arXiv, curated to help you explore the cutting edge of theoretical science.

Discrete Vector Bundles with Connection

This paper establishes a combinatorial theory of discrete vector bundles with connection on locally ordered simplicial complexes, introducing a discrete exterior covariant derivative that mirrors smooth geometric structures and satisfies key identities like the Bianchi identity, while also linking flat connections to twisted de Rham cohomology and providing a concrete comparison with existing frameworks.

Daniel Berwick-Evans, Anil N. Hirani, Mark D. Schubel2026-04-24🔢 math-ph

Derivation of a \PT\PT-Symmetric Sine-Gordon Model from a Nonequilibrium Spin-Boson System via Keldysh Functional Integrals

This paper presents a microscopic derivation of a PT\mathcal{PT}-symmetric non-Hermitian sine-Gordon effective theory from a nonequilibrium spin-boson system using Keldysh functional integrals, establishing a precise dictionary between microscopic parameters and effective couplings to demonstrate that the resulting renormalization group flow, exceptional point physics, and bound-state spectrum align with established non-Hermitian sine-Gordon results.

Vinayak M. Kulkarni2026-04-24🔢 math-ph

Euler--Poincaré reduction and the Kelvin--Noether theorem for discrete mechanical systems with advected parameters and additional dynamics

This paper develops a discrete Euler-Poincaré reduction framework for mechanical systems with advected parameters and additional dynamics using group difference maps, extends the Kelvin-Noether theorem to this discrete setting, and demonstrates the method's effectiveness in preserving geometric properties through applications to underwater vehicle dynamics and numerical simulations.

Yusuke Ono, Simone Fiori, Linyu Peng2026-04-24🔢 math-ph

Discontinuous transition in 2D Potts: I. Order-Disorder Interface convergence

This paper establishes that the order-disorder interface in the 2D qq-state Potts model (for q>4q>4) at the critical temperature is a well-defined object with N\sqrt{N} fluctuations that converges to a Brownian bridge under diffusive scaling, a result proven by coupling the model to the Ashkin-Teller and six-vertex models to derive a renewal picture for the interface.

Moritz Dober, Alexander Glazman, Sébastien Ott2026-04-24🔢 math-ph

Gauss Principle in Incompressible Flow: Unified Variational Perspective on Pressure and Projection

This paper clarifies that the Gauss-Appell principle, when applied at a fixed time to incompressible inviscid flow, yields a variational minimization that uniquely determines the reaction pressure as the Lagrange multiplier enforcing kinematic constraints, thereby recovering the Euler equations and the Leray-Hodge projection without inherently selecting global flow features like circulation.

Karthik Duraisamy2026-04-24🔢 math-ph