Large |η| approach to single field inflation

Tasinato, Gianmassimo

doi:10.1103/physrevd.108.043526

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Large |η| approach to single field inflation

Gianmassimo Tasinato

Physical Review D, Volume: 108, Issue: 4

Swansea University Author: Gianmassimo Tasinato

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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
Online Access:	Check full text
URI:	https://cronfa.swan.ac.uk/Record/cronfa64672
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first_indexed	2023-11-06T15:48:40Z
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spelling	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 SPH 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 Physics COLLEGE CODE SPH 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
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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	2023-08-23T15:55:24Z
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score	11.016235

Large |η| approach to single field inflation

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