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arXiv 1006.2248gr-qcmath-phmath.MP
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球对称Einstein-Vlasov系统的正则性结果

Regularity results for the spherically symmetric Einstein-Vlasov system

Hakan Andreasson

摘要:

在Schwarzschild坐标系和极大各向同性坐标系下研究了球对称Einstein-Vlasov系统。一个开放的问题是没有大小限制的初始数据的全局存在性问题。本工作的主要目的是提出一种方法的方法,一般的初始数据,这提高了规律性的条款,需要估计相比,以前的方法。我们证明了在这两个坐标系中,全局存在性在中心之外成立。在Schwarzschild的情况下,我们改进了在\cite{RRS}中得到的紧初始数据的动量支持上的界。这一改进意味着我们可以接受既有输入物质又有输出物质的非紧数据。这推广了\cite{AR1}中的一个结果。特别是我们的方法避免了处理逐点物质条款的困难任务。此外,我们表明,奇异性从来没有形成在史瓦西时间内进入的物质,只要$3m\leq r.$这消除了额外的假设\cite{A1}。我们的结果在极大各向同性坐标是类似的结果在\cite{R1},但我们的方法是不同的,它提高了正则性的条款,需要估计证明的整体存在性一般。

英文摘要:

The spherically symmetric Einstein-Vlasov system is considered in Schwarzschild coordinates and in maximal-isotropic coordinates. An open problem is the issue of global existence for initial data without size restrictions. The main purpose of the present work is to propose a method of approach for general initial data, which improves the regularity of the terms that need to be estimated compared to previous methods. We prove that global existence holds outside the centre in both these coordinate systems. In the Schwarzschild case we improve the bound on the momentum support obtained in \cite{RRS} for compact initial data. The improvement implies that we can admit non-compact data with both ingoing and outgoing matter. This extends one of the results in \cite{AR1}. In particular our method avoids the difficult task of treating the pointwise matter terms. Furthermore, we show that singularities never form in Schwarzschild time for ingoing matter as long as $3m\leq r.$ This removes an additional assumption made in \cite{A1}. Our result in maximal-isotropic coordinates is analogous to the result in \cite{R1}, but our method is different and it improves the regularity of the terms that need to be estimated for proving global existence in general.

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