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arXiv 1102.3456gr-qc
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单模引力与平均

Unimodular Gravity and Averaging

A. Coley, J. Brannlund, J. Latta

摘要:

在宇宙学中,非均匀时空的平均化问题对于正确解释宇宙学数据很重要。在本文中,我们提出了一个概念上更简单的方法来平均宇宙学的基础上平均的标量在单模重力。作为一个例子,我们考虑一个精确的球对称尘埃模型的例子,并表明,在这种方法平均引入相关性(校正)的有效动力学演化方程的形式的空间曲率项。

英文摘要:

The question of the averaging of inhomogeneous spacetimes in cosmology is important for the correct interpretation of cosmological data. In this paper we suggest a conceptually simpler approach to averaging in cosmology based on the averaging of scalars within unimodular gravity. As an illustration, we consider the example of an exact spherically symmetric dust model, and show that within this approach averaging introduces correlations (corrections) to the effective dynamical evolution equation in the form of a spatial curvature term.

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。

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