arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0810.5045math.APgr-qcmath-phmath.MP
收藏

渐近平坦时空中爱因斯坦-欧拉系统的适定性

Well-Posedness of the Einstein-Euler System in Asymptotically Flat Spacetimes

Uwe Brauer, Lavi Karp

摘要:

证明了耦合Einstein-Euler方程组的经典解的局部存在唯一性定理,从而建立了该方程组的适定性.我们使用的条件是,能量密度可能会消失或趋于零,在无穷大的压力是一个特定的功能的能量密度,条件是用来描述简化的恒星模型。为了实现我们的目标,我们被迫,由于问题的复杂性,处理这些方程在一种新的类型的加权索伯列夫空间的分数阶。除了他们的建设,我们开发工具的偏微分方程和椭圆和双曲型方程在这些空间的技术。在这些空间中得到了它的适定性。所得结果与Rendall关于时间对称性约束下的Euler-Einstein系统和Gamblin关于较简单的Euler-Poisson系统的早期工作有关,并推广了Rendall的早期工作.

英文摘要:

We prove a local in time existence and uniqueness theorem of classical solutions of the coupled Einstein--Euler system, and therefore establish the well posedness of this system. We use the condition that the energy density might vanish or tends to zero at infinity and that the pressure is a certain function of the energy density, conditions which are used to describe simplified stellar models. In order to achieve our goals we are enforced, by the complexity of the problem, to deal with these equations in a new type of weighted Sobolev spaces of fractional order. Beside their construction, we develop tools for PDEs and techniques for elliptic and hyperbolic equations in these spaces. The well posedness is obtained in these spaces. The results obtained are related to and generalize earlier works of Rendall for the Euler-Einstein system under the restriction of time symmetry and of Gamblin for the simpler Euler--Poisson system.

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。

↑