Astrophysics
[Submitted on 6 Oct 1995 (v1), last revised 7 Dec 1995 (this version, v2)]
Title:Higher-Order Gravitational Perturbations of the Cosmic Microwave Background
View PDFAbstract: We study the behavior of light rays in perturbed Robertson-Walker cosmologies, calculating the redshift between an observer and the surface of last scattering to second order in the metric perturbation. At first order we recover the classic results of Sachs and Wolfe, and at second order we delineate the various new effects which appear; there is no {\it a priori} guarantee that these effects are significantly smaller than those at first order, since there are large length scales in the problem which could lead to sizable prefactors. We find that second order terms of potential observational interest may be interpreted as transverse and longitudinal lensing by foreground density perturbations, and a correction to the integrated Sachs-Wolfe effect.
Submission history
From: Sean Carroll [view email][v1] Fri, 6 Oct 1995 17:14:31 UTC (1 KB) (withdrawn)
[v2] Thu, 7 Dec 1995 18:08:31 UTC (24 KB)
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