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arXiv · 1506.04732

Correlation Functions in Stochastic Inflation

Vincent Vennin·Alexei A. Starobinsky
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Abstract

Combining the stochastic and $δN$ formalisms, we derive non perturbative analytical expressions for all correlation functions of scalar perturbations in single-field, slow-roll inflation. The standard, classical formulas are recovered as saddle-point limits of the full results. This yields a classicality criterion that shows that stochastic effects are small only if the potential is sub-Planckian and not too flat. The saddle-point approximation also provides an expansion scheme for calculating stochastic corrections to observable quantities perturbatively in this regime. In the opposite regime, we show that a strong suppression in the power spectrum is generically obtained, and comment on the physical implications of this effect.

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Vincent Vennin, Alexei A. Starobinsky. 2016-11-30. Correlation Functions in Stochastic Inflation. https://doi.org/10.1140/epjc%2Fs10052-015-3643-y

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