Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Article number | 043502 |
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<mark>Journal publication date</mark> | 15/08/2023 |
<mark>Journal</mark> | Physical Review D |
Issue number | 4 |
Volume | 108 |
Publication Status | Published |
<mark>Original language</mark> | English |
Stochastic inflation resolves primordial perturbations nonlinearly, probing their probability distribution deep into its non-Gaussian tail. The strongest perturbations collapse into primordial black holes. In typical black-hole-producing single-field inflation, the strongest stochastic kicks occur during a period of constant roll. In this paper, I solve the stochastic constant-roll system, drawing the stochastic kicks from a numerically computed power spectrum, beyond the usual de Sitter approximation. The perturbation probability distribution is an analytical function of the integrated curvature power spectrum σk2 and the second slow-roll parameter ϵ2. With a large ϵ2, stochastic effects can reduce the height of the curvature power spectrum required to form asteroid mass black holes from 10-2 to 10-3. I compare these results to studies with the nonstochastic ΔN formalism.