Causality and Cosmic Inflation
Abstract
We argue that it is not possible to understand the observed homogeneity of the universe in the context of inflationary models in which the classical Einstein equations are obeyed, the weak energy condition is satisfied, and spacetime topology is trivial. Typical models in which inflation arises from field dynamics in a Friedman-Robertson-Walker background fall into this class. Our arguments rest on causality and general relativistic constraints on the structure of spacetime. We discuss modifications to existing scenarios that can preserve an inflationary solution to the horizon problem.Keywords
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