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arXiv 2211.03347math.AP
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带阻尼与固体核心的球对称欧拉方程真空自由边界问题

On Vacuum Free Boundary Problem of the Spherically Symmetric Euler Equations with Damping and Solid Core

Yan-Lin Wang

AI总结:

本文研究带阻尼与固体核心的球对称欧拉方程真空自由边界问题,在γ>4/3和小初值条件下证明光滑解全局存在及平衡态指数时间衰减稳定。

摘要:

本文针对带阻尼和固体核心的球对称欧拉方程真空自由边界问题,在状态方程 $p=A ρ^γ$(其中 $p$ 为压力,$ρ$ 为密度)中任意有限正气体常数 $A$ 的条件下,获得了光滑解的全局存在性以及平衡态的长时间渐近稳定性,前提是 $γ>4/3$、初始扰动足够小,并且平衡态半径 $R$ 适当地大于固体核心半径 $r_0$。此外,我们得到了光滑解到平衡态的点态收敛,且其收敛速率具有令人惊讶的指数时间衰减率。证明主要基于拉格朗日坐标下的加权能量方法。

英文摘要:

In this paper, the global existence of smooth solution and the long-time asymptotic stability of the equilibrium to vacuum free boundary problem of the spherically symmetric Euler equations with damping and solid core have been obtained for arbitrary finite positive gas constant $A$ in the state equation $p=A ρ^γ$ with $p$ being the pressure and $ρ$ the density, provided that $γ>4/3,$ initial perturbation is small and the radius of the equilibrium $R$ is suitably larger than the radius of the solid core $r_0$. Moreover, we obtain the pointwise convergence from the smooth solution to the equilibrium in a surprisingly exponential time-decay rate. The proof is mainly based on weighted energy method in Lagrangian coordinate.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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