Causality and Cosmic Inflation

Details Causality and Cosmic Inflation Causality and Cosmic Inflation

1998-11-11

arxiv.org/abs/gr-qc/9811037v2

Phys.Rev. D61 (2000) 023502

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, 3 figures, RevTeX, expanded and sharpened discussion of result, figures improved, references added

Scientific paper

10.1103/PhysRevD.61.023502

In the context of inflationary models with a pre-inflationary stage, in which the Einstein equations are obeyed, the weak energy condition is satisfied, and spacetime topology is trivial, we argue that homogeneity on super-Hubble scales must be assumed as an initial condition. Models in which inflation arises from field dynamics in a Friedman-Robertson-Walker background fall into this class but models in which inflation originates at the Planck epoch, {\it eg.} chaotic inflation, may evade this conclusion. Our arguments rest on causality and general relativistic constraints on the structure of spacetime. We discuss modifications to existing scenarios that may avoid the need for initial large-scale homogeneity.

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