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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
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa64673
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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-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.
Keywords: Inflation, primordial black holes, dark matter, early universe
College: Faculty of Science and Engineering
Funders: 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.
Issue: 5
Start Page: 203

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