Non-Gaussianities and the large |η| approach to inflation

Tasinato, Gianmassimo

doi:10.1103/physrevd.109.063510

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Non-Gaussianities and the large |η| approach to inflation

Gianmassimo Tasinato

Physical Review D, Volume: 109, Issue: 6

Swansea University Author: Gianmassimo Tasinato

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DOI (Published version): 10.1103/physrevd.109.063510

Abstract

The physics of primordial black holes can be affected by the non-Gaussian statistics of the density fluctuations that generate them. Therefore, it is important to have good theoretical control of the higher-order correlation functions for primordial curvature perturbations. By working at leading ord...

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Published in:	Physical Review D
ISSN:	2470-0010 2470-0029
Published:	American Physical Society (APS) 2024
Online Access:	Check full text
URI:	https://cronfa.swan.ac.uk/Record/cronfa65789

first_indexed	2024-04-24T16:26:26Z
last_indexed	2024-11-25T14:16:51Z
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spelling	2024-04-24T17:27:54.7624414 v2 65789 2024-03-07 Non-Gaussianities and the large \|η\| approach to inflation cb754b073d1e4949c5e3db97744d3301 0000-0002-9835-4864 Gianmassimo Tasinato Gianmassimo Tasinato true false 2024-03-07 BGPS The physics of primordial black holes can be affected by the non-Gaussian statistics of the density fluctuations that generate them. Therefore, it is important to have good theoretical control of the higher-order correlation functions for primordial curvature perturbations. By working at leading order in a 1/\|η\| expansion, we analytically determine the bispectrum of curvature fluctuations for single field inflationary scenarios producing primordial black holes. The bispectrum has a rich scale and shape dependence, and its features depend on the dynamics of the would-be decaying mode. We apply our analytical results to study gravitational waves induced at second order by enhanced curvature fluctuations. Their statistical properties are derived in terms of convolution integrals over wide momentum ranges, and they are sensitive on the scale and shape dependence of the curvature bispectrum we analytically computed. Journal Article Physical Review D 109 6 American Physical Society (APS) 2470-0010 2470-0029 6 3 2024 2024-03-06 10.1103/physrevd.109.063510 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University SU Library paid the OA fee (TA Institutional Deal) Funded by SCOAP 2024-04-24T17:27:54.7624414 2024-03-07T11:52:37.6385721 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Gianmassimo Tasinato 0000-0002-9835-4864 1 65789__30143__00e86cd80fd4431b8ca82a662c3817fd.pdf 65789.VoR.pdf 2024-04-24T17:25:35.8697590 Output 1297736 application/pdf Version of Record true Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. true eng https://creativecommons.org/licenses/by/4.0/
title	Non-Gaussianities and the large \|η\| approach to inflation
spellingShingle	Non-Gaussianities and the large \|η\| approach to inflation Gianmassimo Tasinato
title_short	Non-Gaussianities and the large \|η\| approach to inflation
title_full	Non-Gaussianities and the large \|η\| approach to inflation
title_fullStr	Non-Gaussianities and the large \|η\| approach to inflation
title_full_unstemmed	Non-Gaussianities and the large \|η\| approach to inflation
title_sort	Non-Gaussianities and the large \|η\| approach to inflation
author_id_str_mv	cb754b073d1e4949c5e3db97744d3301
author_id_fullname_str_mv	cb754b073d1e4949c5e3db97744d3301_***_Gianmassimo Tasinato
author	Gianmassimo Tasinato
author2	Gianmassimo Tasinato
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container_title	Physical Review D
container_volume	109
container_issue	6
publishDate	2024
institution	Swansea University
issn	2470-0010 2470-0029
doi_str_mv	10.1103/physrevd.109.063510
publisher	American Physical Society (APS)
college_str	Faculty of Science and Engineering
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department_str	School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
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description	The physics of primordial black holes can be affected by the non-Gaussian statistics of the density fluctuations that generate them. Therefore, it is important to have good theoretical control of the higher-order correlation functions for primordial curvature perturbations. By working at leading order in a 1/\|η\| expansion, we analytically determine the bispectrum of curvature fluctuations for single field inflationary scenarios producing primordial black holes. The bispectrum has a rich scale and shape dependence, and its features depend on the dynamics of the would-be decaying mode. We apply our analytical results to study gravitational waves induced at second order by enhanced curvature fluctuations. Their statistical properties are derived in terms of convolution integrals over wide momentum ranges, and they are sensitive on the scale and shape dependence of the curvature bispectrum we analytically computed.
published_date	2024-03-06T02:40:28Z
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Non-Gaussianities and the large |η| approach to inflation

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