@Article{Figueroa_etal2021,
author="Figueroa, D. G.
and Raatikainen, S.
and Rasanen, S.
and Tomberg, E.",
title="Non-Gaussian Tail of the Curvature Perturbation in Stochastic Ultraslow-Roll Inflation: Implications for Primordial Black Hole Production",
journal="Physical Review Letters",
year="2021",
publisher="Amer Physical Soc",
volume="127",
number="10",
pages="101302--7pp",
abstract="We consider quantum diffusion in ultraslow-roll (USR) inflation. Using the Delta N formalism, we present the first stochastic calculation of the probability distribution P(R) of the curvature perturbation during USR. We capture the nonlinearity of the system, solving the coupled evolution of the coarse-grained background with random kicks from the short wavelength modes, simultaneously with the mode evolution around the stochastic background. This leads to a non-Markovian process from which we determine the highly non-Gaussian tail of P(R). Studying the production of primordial black holes in a viable model, we find that stochastic effects during USR increase their abundance by a factor of similar to 10(5) compared with the Gaussian approximation.",
optnote="WOS:000692791400004",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4952), last updated on Mon, 13 Sep 2021 13:32:46 +0000",
issn="0031-9007",
doi="10.1103/PhysRevLett.127.101302",
opturl="https://arxiv.org/abs/2012.06551",
opturl="https://doi.org/10.1103/PhysRevLett.127.101302",
language="English"
}