Causality and Cosmic Inflation

  title={Causality and Cosmic Inflation},
  author={Tanmay Vachaspati and Mark Trodden},
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, eg. chaotic inflation, may evade this… CONTINUE READING

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