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Large |η| approach to single field inflation

Gianmassimo Tasinato Orcid Logo

Physical Review D, Volume: 108, Issue: 4

Swansea University Author: Gianmassimo Tasinato Orcid Logo

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DOI (Published version): 10.1103/physrevd.108.043526

Abstract

Single field models of inflation capable of producing primordial black holes usually require a significant departure from the standard, perturbative slow-roll regime. In fact, in many of these scenarios, the size of the slow-roll parameter |η| becomes larger than one during a short phase of inflatio...

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Published in: Physical Review D
ISSN: 2470-0010 2470-0029
Published: American Physical Society (APS) 2023
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URI: https://cronfa.swan.ac.uk/Record/cronfa64672
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spelling 2023-11-06T15:55:18.7936003 v2 64672 2023-10-06 Large |η| approach to single field inflation cb754b073d1e4949c5e3db97744d3301 0000-0002-9835-4864 Gianmassimo Tasinato Gianmassimo Tasinato true false 2023-10-06 BGPS Single field models of inflation capable of producing primordial black holes usually require a significant departure from the standard, perturbative slow-roll regime. In fact, in many of these scenarios, the size of the slow-roll parameter |η| becomes larger than one during a short phase of inflationary evolution. In order to develop an analytical control on these systems, we explore the limit of |η| large, and promote 1/|η| to a small quantity to be used for perturbative expansions. Formulas simplify, and we obtain analytic expressions for the two and three point functions of curvature fluctuations, which share some of the features found in realistic inflationary models generating primordial black holes. We study one-loop corrections in this framework: we discuss criteria for adsorbing ultraviolet divergences into the available parameters, leaving log-enhanced infrared contributions of controllable size. Journal Article Physical Review D 108 4 American Physical Society (APS) 2470-0010 2470-0029 |η|, single field inflation, primordial black holes, one-loop corrections 23 8 2023 2023-08-23 10.1103/physrevd.108.043526 http://dx.doi.org/10.1103/physrevd.108.043526 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University Not Required G. T. is partially funded by the STFC Grant No. ST/T000813/1. 2023-11-06T15:55:18.7936003 2023-10-06T16:08:29.3852932 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Gianmassimo Tasinato 0000-0002-9835-4864 1 64672__28944__fbd0e2c8ec484b029ea221dfe35db004.pdf 64672.VOR.pdf 2023-11-06T15:49:57.2360231 Output 332397 application/pdf Version of Record true Published by the American Physical Society. Distributed under the terms of a Creative Commons Attribution 4.0 International License (CC BY 4.0). true eng https://creativecommons.org/licenses/by/4.0/
title Large |η| approach to single field inflation
spellingShingle Large |η| approach to single field inflation
Gianmassimo Tasinato
title_short Large |η| approach to single field inflation
title_full Large |η| approach to single field inflation
title_fullStr Large |η| approach to single field inflation
title_full_unstemmed Large |η| approach to single field inflation
title_sort Large |η| approach to single field inflation
author_id_str_mv cb754b073d1e4949c5e3db97744d3301
author_id_fullname_str_mv cb754b073d1e4949c5e3db97744d3301_***_Gianmassimo Tasinato
author Gianmassimo Tasinato
author2 Gianmassimo Tasinato
format Journal article
container_title Physical Review D
container_volume 108
container_issue 4
publishDate 2023
institution Swansea University
issn 2470-0010
2470-0029
doi_str_mv 10.1103/physrevd.108.043526
publisher American Physical Society (APS)
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
url http://dx.doi.org/10.1103/physrevd.108.043526
document_store_str 1
active_str 0
description Single field models of inflation capable of producing primordial black holes usually require a significant departure from the standard, perturbative slow-roll regime. In fact, in many of these scenarios, the size of the slow-roll parameter |η| becomes larger than one during a short phase of inflationary evolution. In order to develop an analytical control on these systems, we explore the limit of |η| large, and promote 1/|η| to a small quantity to be used for perturbative expansions. Formulas simplify, and we obtain analytic expressions for the two and three point functions of curvature fluctuations, which share some of the features found in realistic inflationary models generating primordial black holes. We study one-loop corrections in this framework: we discuss criteria for adsorbing ultraviolet divergences into the available parameters, leaving log-enhanced infrared contributions of controllable size.
published_date 2023-08-23T20:25:34Z
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score 11.04748

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