Decay Rate toward the Rarefaction Wave and the Viscous Contact Wave for Jin--Xin Relaxation Model

Mutong He; Feimin Huang; Tianyi Wang; Lingda Xu

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arXiv · 2611.00969

Decay Rate toward the Rarefaction Wave and the Viscous Contact Wave for Jin--Xin Relaxation Model

Mutong He·Feimin Huang·Tianyi Wang·Lingda Xu

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Abstract

This paper establishes the time-decay rates toward the rarefaction wave and the viscous contact wave for the one-dimensional Jin--Xin relaxation system under the $L^1$ integrability condition of the initial perturbation. In the case of a strictly convex flux, we employ a decomposition method to derive a logarithmic $L^1$ estimate related to a conjecture proposed by Liu\cite{liu2001lp}. Furthermore, a time-weighted $L^2$ method yields the optimal decay rate toward the rarefaction wave. Regarding the case where the flux is partially linearly degenerate, by employing a similar $L^1$ estimate and time-weighted $L^2$ method, along with a refined estimate of the nonlinear wave interactions, we obtain the corresponding decay rate toward the composite wave. The decay estimates are obtained without smallness assumptions on the initial perturbations or the wave strength.

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Mutong He, Feimin Huang, Tianyi Wang, Lingda Xu. 2026-10-31. Decay Rate toward the Rarefaction Wave and the Viscous Contact Wave for Jin--Xin Relaxation Model. https://arxiv.org/abs/2611.00969

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