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arxiv: 0707.3919 · v1 · submitted 2007-07-26 · 🌀 gr-qc

A graviton propagator for inflation

classification 🌀 gr-qc
keywords epsilonsittergravitoninflationpropagatorpropagatorsspaceallow
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We construct the scalar and graviton propagator in quasi de Sitter space up to first order in the slow roll parameter $\epsilon\equiv -\dot{H}/H^2$. After a rescaling, the propagators are similar to those in de Sitter space with an $\epsilon$ correction to the effective mass. The limit $\epsilon\to 0$ corresponds to the E(3) vacuum that breaks de Sitter symmetry, but does not break spatial isotropy and homogeneity. The new propagators allow for a self-consistent, dynamical study of quantum back-reaction effects during inflation.

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