The Cosmic Microwave Background and Scalar-Tensor Theories of Gravity
General Relativity and Quantum Cosmology
2009-11-07 v1
Abstract
We show that if all observers see an isotropic cosmic microwave background in an expanding geodesic perfect fluid spacetime within a scalar-tensor theory of gravity, then that spacetime must be isotropic and spatially homogeneous. This result generalizes the Ehlers-Geren-Sachs Theorem of General Relativity, and serves to underpin the important result that any evolving cosmological model in a scalar-tensor theory that is compatible with observations must be almost Friedmann-Lemaitre-Robertson-Walker.
Keywords
Cite
@article{arxiv.gr-qc/0105026,
title = {The Cosmic Microwave Background and Scalar-Tensor Theories of Gravity},
author = {C. A. Clarkson and A. A. Coley and E. S. D. O'Neill},
journal= {arXiv preprint arXiv:gr-qc/0105026},
year = {2009}
}
Comments
6 pages, REVTeX. To appear in Phys. Rev. D