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Quarterly of Applied Mathematics

Quarterly of Applied Mathematics

Online ISSN 1552-4485; Print ISSN 0033-569X

   
 
 

 

Self-similar solutions of the relativistic Euler system with spherical symmetry


Authors: Bing-Ze Lu, Chou Kao and Wen-Ching Lien
Journal: Quart. Appl. Math.
MSC (2020): Primary 35L65, 35L67, 76N10, 83A05
DOI: https://doi.org/10.1090/qam/1680
Published electronically: October 24, 2023
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Abstract: We consider the spherical piston problem in relativistic fluid dynamics. When the spherical piston expands at a constant speed, we show that the self-similar solution with a shock front exists under the relativistic principle that all velocities are bounded by the light speed. The equation of state is given by $P= \sigma ^2 \rho$, where $\sigma$, the sound speed, is a constant. It is an important model describing the evolution of stars. Also, we present the global existence of BV solutions for the relativistic Euler system given that the piston speed is perturbed around a constant in a finite time interval. The analysis is based on the modified Glimm scheme and the smallness assumption is required on the initial data.


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Additional Information

Bing-Ze Lu
Affiliation: Department of Mathematics, National Cheng Kung University, Tainan City 70101, Taiwan
Email: l18081028@gs.ncku.edu.tw

Chou Kao
Affiliation: Department of Mathematics, National Cheng Kung University, Tainan City 70101, Taiwan
MR Author ID: 1485635
Email: l18101030@gs.ncku.edu.tw

Wen-Ching Lien
Affiliation: Department of Mathematics, National Cheng Kung University, Tainan City 70101, Taiwan
MR Author ID: 340649
Email: wlien@mail.ncku.edu.tw

Keywords: Special relativity, relativistic Euler equations, shock waves, supersonic flows, self-similarity, the spherical piston problem
Received by editor(s): April 16, 2023
Received by editor(s) in revised form: September 17, 2023
Published electronically: October 24, 2023
Additional Notes: The first author would like to acknowledge Science College of National Cheng Kung University (NCKU Science) and Ministry of Science and Technology (MOST), Taiwan, Republic of China, for the fellowship to support his PhD study in mathematics.
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