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arXiv 2202.01835gr-qcmath-phmath.MP
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球对称Einstein-Vlasov系统的静态解:一种粒子数-Casimir方法

Static solutions to the spherically symmetric Einstein-Vlasov system: a particle-number-Casimir approach

Håkan Andréasson, Markus Kunze

AI总结:

研究球对称Einstein-Vlasov系统静态解是否作为变分问题极小值子出现的问题,通过将粒子数-Casimir泛函的Euler-Lagrange方程作为不动点问题求解,构造出静态解并证明其构成系统解。

摘要:

球对称Einstein-Vlasov系统解的存在性是众所周知的。然而,静态解是否作为变分问题的极小值子出现,仍是一个未解决的问题。除了其本身的意义外,正是其与非线性稳定性的联系赋予了该主题重要性。该问题曾在\cite{Wol}中被考虑,但正如\cite{AK}中所指出的,\cite{Wol}一文包含严重缺陷。在本研究中,我们通过将能量密度$ρ$的Euler-Lagrange方程作为不动点问题求解,构造了静态解。该Euler-Lagrange方程源于\cite{Wol}中引入的粒子数-Casimir泛函。随后,我们在相空间上定义诱导能量密度$ρ$的密度函数$f$,并证明其构成Einstein-Vlasov系统的静态解。因此,我们严格解决了\cite{Wol}作者曾试图证明的部分内容。

英文摘要:

Existence of spherically symmetric solutions to the Einstein-Vlasov system is well-known. However, it is an open problem whether or not static solutions arise as minimizers of a variational problem. Apart from being of interest in its own right, it is the connection to non-linear stability that gives this topic its importance. This problem was considered in \cite{Wol}, but as has been pointed out in \cite{AK}, the paper \cite{Wol} contained serious flaws. In this work we construct static solutions by solving the Euler-Lagrange equation for the energy density $ρ$ as a fixed point problem. The Euler-Lagrange equation originates from the particle number-Casimir functional introduced in \cite{Wol}. We then define a density function $f$ on phase space which induces the energy density $ρ$ and we show that it constitutes a static solution of the Einstein-Vlasov system. Hence we settle rigorously parts of what the author of \cite{Wol} attempted to prove.

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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