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New universal property of cosmological gravitational wave anisotropies

Ameek Malhotra Orcid Logo, Ema Dimastrogiovanni Orcid Logo, Guillem Domènech, Matteo Fasiello, Gianmassimo Tasinato Orcid Logo

Physical Review D, Volume: 107, Issue: 10

Swansea University Author: Gianmassimo Tasinato Orcid Logo

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DOI (Published version): 10.1103/physrevd.107.103502

Abstract

The anisotropies of the stochastic gravitational wave background, as produced in the early phases of cosmological evolution, can act as a key probe of the primordial universe particle content. We point out a new universal property of gravitational wave anisotropies of cosmological origin: for adiaba...

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Published in: Physical Review D
ISSN: 2470-0010 2470-0029
Published: American Physical Society (APS)
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URI: https://cronfa.swan.ac.uk/Record/cronfa64674
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spelling v2 64674 2023-10-06 New universal property of cosmological gravitational wave anisotropies cb754b073d1e4949c5e3db97744d3301 0000-0002-9835-4864 Gianmassimo Tasinato Gianmassimo Tasinato true false 2023-10-06 SPH The anisotropies of the stochastic gravitational wave background, as produced in the early phases of cosmological evolution, can act as a key probe of the primordial universe particle content. We point out a new universal property of gravitational wave anisotropies of cosmological origin: for adiabatic initial conditions, their angular power spectrum is insensitive to the equation of state of the cosmic fluid driving the expansion before big bang nucleosynthesis. Any deviation from this universal behavior points to the presence of nonadiabatic sources of primordial fluctuations. Such scenarios can be tested by gravitational wave detectors operating at a frequency range which is fully complementary to cosmic microwave background (CMB) experiments. In this work, we prove this general result, and we illustrate its consequences for a representative realization of initial conditions based on the curvaton scenario. In the case of the simplest curvaton setup, we also find a significant cross-correlation between gravitational wave anisotropies and the CMB temperature fluctuations. There is a fourfold enhancement vis-à-vis the purely adiabatic scenario. We discuss the implications of our findings for identifying the origin of the (cosmological) gravitational wave background when, as is often the case, this cannot be determined solely on the basis of its spectral shape. Journal Article Physical Review D 107 10 American Physical Society (APS) 2470-0010 2470-0029 Gravitational wave, anisotropies, cosmological origin 0 0 0 0001-01-01 10.1103/physrevd.107.103502 http://dx.doi.org/10.1103/physrevd.107.103502 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University Not Required 2023-12-01T15:05:07.9258912 2023-10-06T16:14:08.0339564 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Ameek Malhotra 0000-0001-8346-9995 1 Ema Dimastrogiovanni 0000-0001-9576-0608 2 Guillem Domènech 3 Matteo Fasiello 4 Gianmassimo Tasinato 0000-0002-9835-4864 5 64674__28727__d6218104d52d40b7946747b752e68007.pdf 2212.10316.pdf 2023-10-06T16:15:06.4594138 Output 1787215 application/pdf Accepted Manuscript true true eng
title New universal property of cosmological gravitational wave anisotropies
spellingShingle New universal property of cosmological gravitational wave anisotropies
Gianmassimo Tasinato
title_short New universal property of cosmological gravitational wave anisotropies
title_full New universal property of cosmological gravitational wave anisotropies
title_fullStr New universal property of cosmological gravitational wave anisotropies
title_full_unstemmed New universal property of cosmological gravitational wave anisotropies
title_sort New universal property of cosmological gravitational wave anisotropies
author_id_str_mv cb754b073d1e4949c5e3db97744d3301
author_id_fullname_str_mv cb754b073d1e4949c5e3db97744d3301_***_Gianmassimo Tasinato
author Gianmassimo Tasinato
author2 Ameek Malhotra
Ema Dimastrogiovanni
Guillem Domènech
Matteo Fasiello
Gianmassimo Tasinato
format Journal article
container_title Physical Review D
container_volume 107
container_issue 10
institution Swansea University
issn 2470-0010
2470-0029
doi_str_mv 10.1103/physrevd.107.103502
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
url http://dx.doi.org/10.1103/physrevd.107.103502
document_store_str 1
active_str 0
description The anisotropies of the stochastic gravitational wave background, as produced in the early phases of cosmological evolution, can act as a key probe of the primordial universe particle content. We point out a new universal property of gravitational wave anisotropies of cosmological origin: for adiabatic initial conditions, their angular power spectrum is insensitive to the equation of state of the cosmic fluid driving the expansion before big bang nucleosynthesis. Any deviation from this universal behavior points to the presence of nonadiabatic sources of primordial fluctuations. Such scenarios can be tested by gravitational wave detectors operating at a frequency range which is fully complementary to cosmic microwave background (CMB) experiments. In this work, we prove this general result, and we illustrate its consequences for a representative realization of initial conditions based on the curvaton scenario. In the case of the simplest curvaton setup, we also find a significant cross-correlation between gravitational wave anisotropies and the CMB temperature fluctuations. There is a fourfold enhancement vis-à-vis the purely adiabatic scenario. We discuss the implications of our findings for identifying the origin of the (cosmological) gravitational wave background when, as is often the case, this cannot be determined solely on the basis of its spectral shape.
published_date 0001-01-01T15:05:08Z
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score 11.037603

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