Eternal inflation and energy conditions in de Sitter spacetime

Details Eternal inflation and energy conditions in de Sitter spacetime Eternal inflation and energy conditions in de Sitter spacetime

2003-05-22

arxiv.org/abs/astro-ph/0305439v1

Astronomy and Astrophysics

Astrophysics

Talk presented at Davis Inflation Meeting, 2003 (astro-ph/0304225)

Scientific paper

Eternal inflation is shown to require violations of the Null Energy Condition (NEC) on superhorizon scales. With light scalar fields as the matter sources in a de Sitter background, there can be no classical or semiclassical violations of the NEC. However, quantum fluctuations of the energy-momentum tensor, described by an expectation value of four field operators, do lead to large-scale NEC violations. The backreaction of such quantum fluctuations on the inflating spacetime is generally deduced at a heuristic level and leads to the eternal inflation scenario. A rigorous treatment of the backreaction will necessarily include fluctuations of the metric, and several new effects are expected to come into play.

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