Swiss-cheese models and the Dyer-Roeder approximation
arXiv:1402.3123 · doi:10.1088/1475-7516/2014/06/054
Abstract
In view of interpreting the cosmological observations precisely, especially when they involve narrow light beams, it is crucial to understand how light propagates in our statistically homogeneous, clumpy, Universe. Among the various approaches to tackle this issue, Swiss-cheese models propose an inhomogeneous spacetime geometry which is an exact solution of Einstein's equation, while the Dyer-Roeder approximation deals with inhomogeneity in an effective way. In this article, we demonstrate that the distance-redshift relation of a certain class of Swiss-cheese models is the same as the one predicted by the Dyer-Roeder approach, at a well-controlled level of approximation. Both methods are therefore equivalent when applied to the interpretation of, e.g., supernova observations. The proof relies on completely analytical arguments, and is illustrated by numerical results.
32 pages, 8 figures. v2: typos and Eqs. (4.15), (4.17) corrected; discussion on backreaction modified and extended; matches published version. v3: mistake in Sec. 3.1 corrected
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