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arXiv 1002.5001gr-qc
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非引力场与单纯时空的耦合

Coupling Non-Gravitational Fields with Simplicial Spacetimes

Jonathan R. McDonald, Warner A. Miller

摘要:

在离散重力场中如何包含源项是一个长期存在的问题。在雷吉演算(RC)中提供源与晶格的一致耦合,可以产生适用于数值相对论和量子引力的鲁棒非结构化时空网格。RC提供了一个特别有见地的方法来解决这个问题,其纯粹的几何表示的时空。RC的单纯构建块使我们能够以无坐标的方式表示所有物质和场。我们提供了一个解释RC作为一个离散的外部演算框架,其中非引力场自然耦合的单纯晶格。利用这种方法,我们得到了非引力场的连续作用量到Regge格点的一致映射。在本文中,我们应用这个框架的标量,矢量和张量场。特别地,我们重建了(1)标量场,(2)麦克斯韦场张量和(3)狄拉克粒子的晶格作用量。我们的离散化技术,这三个领域的直接应用表明了一个通用的实施耦合源的晶格在Regge演算。

英文摘要:

The inclusion of source terms in discrete gravity is a long-standing problem. Providing a consistent coupling of source to the lattice in Regge Calculus (RC) yields a robust unstructured spacetime mesh applicable to both numerical relativity and quantum gravity. RC provides a particularly insightful approach to this problem with its purely geometric representation of spacetime. The simplicial building blocks of RC enable us to represent all matter and fields in a coordinate-free manner. We provide an interpretation of RC as a discrete exterior calculus framework into which non-gravitational fields naturally couple with the simplicial lattice. Using this approach we obtain a consistent mapping of the continuum action for non-gravitational fields to the Regge lattice. In this paper we apply this framework to scalar, vector and tensor fields. In particular we reconstruct the lattice action for (1) the scalar field, (2) Maxwell field tensor and (3) Dirac particles. The straightforward application of our discretization techniques to these three fields demonstrates a universal implementation of coupling source to the lattice in Regge calculus.

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