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Inflation and Primordial Black Holes

Ogan Ozsoy Orcid Logo, Gianmassimo Tasinato Orcid Logo

Universe, Volume: 9, Issue: 5, Start page: 203

Swansea University Authors: Ogan Ozsoy Orcid Logo, Gianmassimo Tasinato Orcid Logo

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DOI (Published version): 10.3390/universe9050203

Abstract

We review conceptual aspects of inflationary scenarios able to produce primordial black holes by amplifying the size of curvature fluctuations to the level required to trigger black hole formation. We identify general mechanisms to do so, both for single- and multiple-field inflation. In single-fiel...

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Published in: Universe
ISSN: 2218-1997
Published: MDPI AG 2023
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URI: https://cronfa.swan.ac.uk/Record/cronfa64673
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spelling 2023-11-06T16:05:02.1526088 v2 64673 2023-10-06 Inflation and Primordial Black Holes bedcd6ceb7665b372690aff22dd18cec 0000-0001-8783-1728 Ogan Ozsoy Ogan Ozsoy true false cb754b073d1e4949c5e3db97744d3301 0000-0002-9835-4864 Gianmassimo Tasinato Gianmassimo Tasinato true false 2023-10-06 BGPS We review conceptual aspects of inflationary scenarios able to produce primordial black holes by amplifying the size of curvature fluctuations to the level required to trigger black hole formation. We identify general mechanisms to do so, both for single- and multiple-field inflation. In single-field inflation, the spectrum of curvature fluctuations is enhanced by pronounced gradients of background quantities controlling the cosmological dynamics, which can induce brief phases of non-slow-roll inflationary evolution. In multiple-field inflation, the amplification occurs through appropriate couplings with additional sectors characterized by tachyonic instabilities that enhance the size of their fluctuations. As representative examples, we consider axion inflation and two-field models of inflation with rapid turns in field space. We develop our discussion in a pedagogical manner by including some of the most relevant calculations and by guiding the reader through the existing theoretical literature, emphasizing general themes common to several models. Journal Article Universe 9 5 203 MDPI AG 2218-1997 Inflation, primordial black holes, dark matter, early universe 24 4 2023 2023-04-24 10.3390/universe9050203 http://dx.doi.org/10.3390/universe9050203 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University Not Required O.Ö. is supported by the “Juan de la Cierva” fellowship IJC2020-045803-I, the European Structural and Investment Funds and the Czech Ministry of Education, Youth and Sports (Project CoGraDS-CZ.02.1.01/0.0/0.0/15003/0000437) and by the Spanish Research Agency (Agencia Estatal de Investigación) through the Grant IFT Centro de Excelencia Severo Ochoa No CEX2020-001007-S funded by MCIN/AEI/10.13039/501100011033. G.T. is partially funded by the STFC grant ST/T000813/1. 2023-11-06T16:05:02.1526088 2023-10-06T16:11:17.9910761 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Ogan Ozsoy 0000-0001-8783-1728 1 Gianmassimo Tasinato 0000-0002-9835-4864 2 64673__28945__d13c3d55d1b14465af4f3f18afbcce74.pdf 64673.VOR.pdf 2023-11-06T16:04:09.0253949 Output 3039542 application/pdf Version of Record true © 2023 by the authors. Licensee MDPI, Basel, Switzerland. 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 Inflation and Primordial Black Holes
spellingShingle Inflation and Primordial Black Holes
Ogan Ozsoy
Gianmassimo Tasinato
title_short Inflation and Primordial Black Holes
title_full Inflation and Primordial Black Holes
title_fullStr Inflation and Primordial Black Holes
title_full_unstemmed Inflation and Primordial Black Holes
title_sort Inflation and Primordial Black Holes
author_id_str_mv bedcd6ceb7665b372690aff22dd18cec
cb754b073d1e4949c5e3db97744d3301
author_id_fullname_str_mv bedcd6ceb7665b372690aff22dd18cec_***_Ogan Ozsoy
cb754b073d1e4949c5e3db97744d3301_***_Gianmassimo Tasinato
author Ogan Ozsoy
Gianmassimo Tasinato
author2 Ogan Ozsoy
Gianmassimo Tasinato
format Journal article
container_title Universe
container_volume 9
container_issue 5
container_start_page 203
publishDate 2023
institution Swansea University
issn 2218-1997
doi_str_mv 10.3390/universe9050203
publisher MDPI AG
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/10.3390/universe9050203
document_store_str 1
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description We review conceptual aspects of inflationary scenarios able to produce primordial black holes by amplifying the size of curvature fluctuations to the level required to trigger black hole formation. We identify general mechanisms to do so, both for single- and multiple-field inflation. In single-field inflation, the spectrum of curvature fluctuations is enhanced by pronounced gradients of background quantities controlling the cosmological dynamics, which can induce brief phases of non-slow-roll inflationary evolution. In multiple-field inflation, the amplification occurs through appropriate couplings with additional sectors characterized by tachyonic instabilities that enhance the size of their fluctuations. As representative examples, we consider axion inflation and two-field models of inflation with rapid turns in field space. We develop our discussion in a pedagogical manner by including some of the most relevant calculations and by guiding the reader through the existing theoretical literature, emphasizing general themes common to several models.
published_date 2023-04-24T05:16:57Z
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