# Uniqueness of dissipative solutions to the complete Euler system

## TL;DR

This paper establishes the uniqueness of dissipative solutions to the complete Euler system under a one-sided Lipschitz condition on velocity in Besov spaces, using commutator estimates and relative entropy methods.

## Contribution

It introduces a new uniqueness criterion for weak solutions of the Euler system based on a one-sided Lipschitz bound in Besov spaces, extending previous results.

## Key findings

- Uniqueness of dissipative solutions under Lipschitz condition.
- Extension of uniqueness to weak solutions with Besov regularity.
- Application of commutator estimates and relative entropy methods.

## Abstract

Dissipative solutions have recently been studied as a generalized concept for weak solutions of the complete Euler system. Apparently, these are expectations of suitable measure-valued solutions. Motivated from [Feireisl, Ghoshal and Jana, Commun. Partial Differ. Equ., 2019], we impose a one-sided Lipschitz bound on velocity component as uniqueness criteria for a weak solution in Besov space $B^{\alpha,\infty}_{p}$ with $\alpha>1/2$. We prove that the Besov solution satisfying the above-mentioned condition is unique in the class of dissipative solutions. In the later part of this article, we prove that the one-sided Lipschitz condition gives uniqueness among weak solutions with the Besov regularity, $B^{\alpha,\infty}_{3}$ for $\alpha>1/3$. Our proof relies on commutator estimates for Besov functions and the relative entropy method.