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arXiv 0909.5674gr-qcmath.AP
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Einstein约束方程共形参数化的一个模型问题

A model problem for conformal parameterizations of the Einstein constraint equations

David Maxwell

摘要:

我们调查的可能性,共形和共形薄三明治(CTS)方法可以用来参数化的真空爱因斯坦约束方程组的解决方案。为此,我们开发了一个模型问题,通过采取商的某些对称数据共形平坦环面。专门的模型问题的三参数家庭的共形数据,我们观察到一些新的现象的共形和CTS方法。在这个族中,只要平均曲率不变号,我们就得到了一个普遍的存在定理。当平均曲率改变符号时,我们发现对于某些数据,解存在当且仅当横截无迹张量足够小。当这种解决方案存在时,通常不止一种。此外,理论的平均曲率改变的符号被证明是非常敏感的耦合常数的值在爱因斯坦约束方程。

英文摘要:

We investigate the possibility that the conformal and conformal thin sandwich (CTS) methods can be used to parameterize the set of solutions of the vacuum Einstein constraint equations. To this end we develop a model problem obtained by taking the quotient of certain symmetric data on conformally flat tori. Specializing the model problem to a three-parameter family of conformal data we observe a number of new phenomena for the conformal and CTS methods. Within this family, we obtain a general existence theorem so long as the mean curvature does not change sign. When the mean curvature changes sign, we find that for certain data solutions exist if and only if the transverse-traceless tensor is sufficiently small. When such solutions exist, there are generically more than one. Moreover, the theory for mean curvatures changing sign is shown to be extremely sensitive with respect to the value of a coupling constant in the Einstein constraint equations.

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