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arXiv · 2611.01258

$a$-contraction applied to the time-asymptotic stability of weak shocks for a general 1-D viscous system

Young-Sam Kwon·Jiayun Meng·Alexis Vasseur
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Abstract

The method of $a$-contraction with shifts builds on the relative entropy method of Dafermos and DiPerna and allows both viscous shocks and rarefaction waves to be studied directly at the level of the solution. This unified framework led to the resolution of Matsumura's long-standing conjecture on the time-asymptotic stability of a viscous shock in composition with a rarefaction. Kang, Vasseur, and Wang established this stability for the one-dimensional compressible barotropic Navier-Stokes system. Their result was subsequently extended to composite planar waves for general $n\times n$ viscous systems in arbitrary spatial dimensions. The present paper is a companion to that work. Here we prove the estimates on viscous shock profiles needed to apply $a$-contraction with shifts, including derivative estimates that go beyond the standard bounds. We also give a streamlined account of the main ideas of the method by focusing on a single viscous shock for a general one-dimensional system.

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Young-Sam Kwon, Jiayun Meng, Alexis Vasseur. 2026-10-31. $a$-contraction applied to the time-asymptotic stability of weak shocks for a general 1-D viscous system. https://arxiv.org/abs/2611.01258

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