Electron. J. Differential Equations, Vol. 2022 (2022), No. 64, pp. 1-18.

Optimal decay rates for higher-order derivatives of solutions to 3D compressible Navier-Stokes-Poisson equations with external force

Liuna Qin, Changguo Xiao, Yinghui Zhang

Abstract:
We investigate optimal decay rates for higher-order spatial derivatives of solutions to the 3D compressible Navier-Stokes-Poisson equations with external force. The main novelty of this article is twofold: First, we prove the first and second order spatial derivatives of the solutions converge to zero at the L2-rate (1+t)-5/4, which is faster than the L2-rate (1+t)-3/4 in Li-Zhang [15]. Second, for well-chosen initial data, we show the lower optimal decay rates of the first order spatial derivative of the solutions. Therefore, our decay rates are optimal in this sense.

Submitted August 1, 2021. Published September 7, 2022.
Math Subject Classifications: 76B03, 35Q35.
Key Words: Compressible Navier-Stokes-Poisson system; external force; higher-order derivative.
DOI: https://doi.org/10.58997/ejde.2022.64

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Liuna Qin
School of Mathematics and Statistics
Guangxi Normal University
Guilin, Guangxi 541004, China
email: liunaqin321@stu.gxnu.edu.cn
Changguo Xiao
School of Mathematics and Statistics
Guangxi Normal University
Guilin, Guangxi 541004, China
email: changguoxiao@mailbox.gxnu.edu.cn
Yinghui Zhang
School of Mathematics and Statistics
Guangxi Normal University
Guilin, Guangxi 541004, China
email: yinghuizhang@mailbox.gxnu.edu.cn

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