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Non-Gaussianities and the large |η| approach to inflation
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...
Published in: | Physical Review D |
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ISSN: | 2470-0010 2470-0029 |
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American Physical Society (APS)
2024
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URI: | https://cronfa.swan.ac.uk/Record/cronfa65789 |
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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 SPH 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 Physics COLLEGE CODE SPH 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 |
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cb754b073d1e4949c5e3db97744d3301 |
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cb754b073d1e4949c5e3db97744d3301_***_Gianmassimo Tasinato |
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Gianmassimo Tasinato |
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Gianmassimo Tasinato |
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Journal article |
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Physical Review D |
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109 |
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6 |
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2024 |
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Swansea University |
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2470-0010 2470-0029 |
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10.1103/physrevd.109.063510 |
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American Physical Society (APS) |
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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 |
2024-03-06T17:27:53Z |
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1797234175069126656 |
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11.02701 |