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CMB μT cross correlations as a probe of primordial black hole scenarios

Ogan Ozsoy Orcid Logo, Gianmassimo Tasinato Orcid Logo

Physical Review D, Volume: 104, Issue: 4

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

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DOI (Published version): 10.1103/physrevd.104.043526

Abstract

We propose a new method for probing inflationary models of primordial black hole (PBH) production, using only CMB physics at relatively large scales. In PBH scenarios, the primordial power spectrum profile for curvature perturbations is characterized by a pronounced dip, followed by a rapid growth t...

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Published in: Physical Review D
ISSN: 2470-0010 2470-0029
Published: American Physical Society (APS) 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa57929
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first_indexed 2021-09-22T15:29:37Z
last_indexed 2021-10-06T03:22:39Z
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spelling 2021-10-05T14:52:05.7532115 v2 57929 2021-09-16 CMB μT cross correlations as a probe of primordial black hole scenarios bedcd6ceb7665b372690aff22dd18cec 0000-0001-8783-1728 Ogan Ozsoy Ogan Ozsoy true false cb754b073d1e4949c5e3db97744d3301 0000-0002-9835-4864 Gianmassimo Tasinato Gianmassimo Tasinato true false 2021-09-16 SPH We propose a new method for probing inflationary models of primordial black hole (PBH) production, using only CMB physics at relatively large scales. In PBH scenarios, the primordial power spectrum profile for curvature perturbations is characterized by a pronounced dip, followed by a rapid growth toward small scales, leading to a peak responsible for PBH formation. We focus on scales around the dip that are well separated from the peak to analytically compute expressions for the curvature power spectrum and bispectrum. The size of the squeezed bispectrum is enhanced at the position of the dip, and it acquires a characteristic scale dependence that can be probed by cross correlating CMB μ-distortions and temperature fluctuations. We quantitatively study the properties of such cross correlations and how they depend on the underlying model, discussing how they can be tested by the next generation of CMB μ-distortion experiments. This method allows one to experimentally probe inflationary PBH scenarios using well-understood CMB physics, without considering nonlinearities associated with PBH formation and evolution. Journal Article Physical Review D 104 4 American Physical Society (APS) 2470-0010 2470-0029 19 8 2021 2021-08-19 10.1103/physrevd.104.043526 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2021-10-05T14:52:05.7532115 2021-09-16T17:35:55.5895623 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 57929__21025__60d00d30718946afa01a4c8e150828e2.pdf 57929.pdf 2021-09-28T09:57:02.9807733 Output 729504 application/pdf Accepted Manuscript true Released under the terms of the Creative Commons Attribution license true eng https://creativecommons.org/licenses/by-nc-nd/3.0/
title CMB μT cross correlations as a probe of primordial black hole scenarios
spellingShingle CMB μT cross correlations as a probe of primordial black hole scenarios
Ogan Ozsoy
Gianmassimo Tasinato
title_short CMB μT cross correlations as a probe of primordial black hole scenarios
title_full CMB μT cross correlations as a probe of primordial black hole scenarios
title_fullStr CMB μT cross correlations as a probe of primordial black hole scenarios
title_full_unstemmed CMB μT cross correlations as a probe of primordial black hole scenarios
title_sort CMB μT cross correlations as a probe of primordial black hole scenarios
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 Physical Review D
container_volume 104
container_issue 4
publishDate 2021
institution Swansea University
issn 2470-0010
2470-0029
doi_str_mv 10.1103/physrevd.104.043526
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
document_store_str 1
active_str 0
description We propose a new method for probing inflationary models of primordial black hole (PBH) production, using only CMB physics at relatively large scales. In PBH scenarios, the primordial power spectrum profile for curvature perturbations is characterized by a pronounced dip, followed by a rapid growth toward small scales, leading to a peak responsible for PBH formation. We focus on scales around the dip that are well separated from the peak to analytically compute expressions for the curvature power spectrum and bispectrum. The size of the squeezed bispectrum is enhanced at the position of the dip, and it acquires a characteristic scale dependence that can be probed by cross correlating CMB μ-distortions and temperature fluctuations. We quantitatively study the properties of such cross correlations and how they depend on the underlying model, discussing how they can be tested by the next generation of CMB μ-distortion experiments. This method allows one to experimentally probe inflationary PBH scenarios using well-understood CMB physics, without considering nonlinearities associated with PBH formation and evolution.
published_date 2021-08-19T04:14:02Z
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score 11.035634

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