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arXiv 1402.5585gr-qcmath-phmath.MP
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保角法与保角薄夹层法是相同的

The Conformal Method and the Conformal Thin-Sandwich Method Are the Same

David Maxwell

摘要:

在20世纪70年代发展起来的保形方法和最近的拉格朗日和哈密顿保形薄三明治方法是寻找爱因斯坦约束方程的解决方案的技术。我们表明,它们是一个单一的共形方法的表现形式:有一个简单的方法来转换来回这些方法的参数,使爱因斯坦约束方程的相应的解决方案同意。统一的想法是需要明确区分正切和余切向量的空间上的流形上的共形类,我们介绍了一个词汇表与这些对象的工作,而不参考一个特定的代表性的背景度量。由于这些概念上的优势,我们演示了如何加强以前的近CMC存在性和不存在定理的原始保形方法,包括度量与标量曲率的变化标志。

英文摘要:

The conformal method developed in the 1970s and the more recent Lagrangian and Hamiltonian conformal thin-sandwich methods are techniques for finding solutions of the Einstein constraint equations. We show that they are manifestations of a single conformal method: there is a straightforward way to convert back and forth between the parameters for these methods so that the corresponding solutions of the Einstein constraint equations agree. The unifying idea is the need to clearly distinguish tangent and cotangent vectors to the space of conformal classes on a manifold, and we introduce a vocabulary for working with these objects without reference to a particular representative background metric. As a consequence of these conceptual advantages, we demonstrate how to strengthen previous near-CMC existence and non-existence theorems for the original conformal method to include metrics with scalar curvatures that change sign.

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