• Open Access

Stochastic nonattractor inflation

Hassan Firouzjahi, Amin Nassiri-Rad, and Mahdiyar Noorbala
Phys. Rev. D 102, 123504 – Published 1 December 2020

Abstract

We extend the formalism of stochastic inflation to the setup of nonattractor inflation with a sound speed cs. We obtain the Langevin equations for the superhorizon perturbations and calculate the stochastic corrections to curvature perturbation power spectrum. It is shown that the fractional stochastic corrections in mean number of e-folds and power spectrum are at the order of power spectrum. We also calculate the boundary crossing and the first hitting probabilities in a hypothetical dS space with two boundaries in field space. Furthermore, the stochastic corrections in power spectrum in a setup akin to eternal inflation with large diffusion term are calculated.

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  • Received 17 September 2020
  • Accepted 9 November 2020

DOI:https://doi.org/10.1103/PhysRevD.102.123504

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Hassan Firouzjahi1,*, Amin Nassiri-Rad1,†, and Mahdiyar Noorbala2,1,‡

  • 1School of Astronomy, Institute for Research in Fundamental Sciences (IPM) P. O. Box 19395-5531, Tehran, Iran
  • 2Department of Physics, University of Tehran, Iran, P. O. Box 14395-547, Tehran, Iran

  • *firouz@ipm.ir
  • amin.nassiriraad@ipm.ir
  • mnoorbala@ut.ac.ir

Article Text

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Issue

Vol. 102, Iss. 12 — 15 December 2020

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