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arXiv 0708.3410gr-qc
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具有非常数平均曲率的Einstein约束方程的粗糙解

Rough solutions of the Einstein constraint equations with nonconstant mean curvature

M. Holst, J. Kommemi, G. Nagy

摘要:

本文考虑了Lichnerowicz和York提出的爱因斯坦约束方程在带边界的紧致流形上的共形分解。我们使用适当的Banach空间的顺序关系,以获得弱解的推广已知的子和超级解决方案(障碍)的哈密顿约束。的障碍相结合的变分方法,建立在本质上有界函数的空间和Sobolev空间H1的交集的哈密顿约束的解决方案的存在性。结果是建立标量曲率R的背景度量有任何符号;非负R需要额外的积极性假设,无论是对物质的能量密度或非本征曲率的无迹发散部分。虽然公式是不同的,结果可以被看作是降低了最近的麦克斯韦粗糙CMC解决方案的结果的规律性。我们还建立了哈密顿和动量约束方程的非CMC解的存在性。结果是直接使用不动点迭代和紧性参数得到的,而不是通过构建一个压缩映射。非CMC结果可以被看作是Isenberg和Moncrief的1996年非CMC结果的正则性到较低正则性和具有任何符号的标量曲率R的一种类型的扩展。

英文摘要:

We consider the conformal decomposition of Einstein's constraint equations introduced by Lichnerowicz and York, on a compact manifold with boundary. We use order relations on appropriate Banach spaces to derive weak solution generalizations of known sub- and super-solutions (barriers) for the Hamiltonian constraint. The barriers are combined with variational methods to establish existence of solutions to the Hamiltonian constraint in the intersection of the space of essentially bounded functions and the Sobolev space H1. The result is established for scalar curvature R of the background metric having any sign; non-negative R requires additional positivity assumptions either on the matter energy density or on the trace-free divergence-free part of the extrinsic curvature. Although the formulation is different, the result can be viewed as lowering the regularity of the recent result of Maxwell on rough CMC solutions. We also establish existence of non-CMC solutions of the Hamiltonian and momentum constraint equations. The result is obtained using fixed-point iteration and compactness arguments directly, rather than by building a contraction map. The non-CMC result can be viewed as a type of extension of the regularity of the 1996 non-CMC result of Isenberg and Moncrief to lower regularity and to scalar curvature R having any sign.

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