The hand-made tail: non-perturbative tails from multifield inflation
Publication Date
2022-05-09Journal Title
Journal of High Energy Physics
ISSN
1126-6708
Publisher
Springer Berlin Heidelberg
Volume
2022
Issue
5
Language
en
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Achúcarro, A., Céspedes, S., Davis, A., & Palma, G. A. (2022). The hand-made tail: non-perturbative tails from multifield inflation. Journal of High Energy Physics, 2022 (5) https://doi.org/10.1007/jhep05(2022)052
Abstract
Abstract: It is becoming increasingly clear that large but rare fluctuations of the primordial curvature field, controlled by the tail of its probability distribution, could have dramatic effects on the current structure of the universe — e.g. via primordial black-holes. However, the use of standard perturbation theory to study the evolution of fluctuations during inflation fails in providing a reliable description of how non-linear interactions induce non-Gaussian tails. Here, we use the stochastic inflation formalism to study the non-perturbative effects from multi-field fluctuations on the statistical properties of the primordial curvature field. Starting from the effective action describing multi-field fluctuations, we compute the joint probability density function and show that enhanced non-Gaussian tails are a generic feature of slow-roll inflation with additional degrees of freedom.
Keywords
Regular Article - Theoretical Physics, Cosmology of Theories BSM, Effective Field Theories, Renormalization Group
Identifiers
jhep05(2022)052, 18340
External DOI: https://doi.org/10.1007/jhep05(2022)052
This record's URL: https://www.repository.cam.ac.uk/handle/1810/337027
Rights
Licence:
http://creativecommons.org/licenses/by/4.0/
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