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Enhancing gravitational wave anisotropies with peaked scalar sources
Journal of Cosmology and Astroparticle Physics, Volume: 2023, Issue: 01, Start page: 018
Swansea University Author:
Gianmassimo Tasinato
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DOI (Published version): 10.1088/1475-7516/2023/01/018
Abstract
Gravitational wave (GW) backgrounds of cosmological origin are expected to be nearly isotropic, with small anisotropies resembling those of the cosmic microwave background. We analyse the case of a scalar-induced GW background and clarify in the process the relation between two different approaches...
| Published in: | Journal of Cosmology and Astroparticle Physics |
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| ISSN: | 1475-7516 |
| Published: |
IOP Publishing
2023
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| Online Access: |
Check full text
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa62473 |
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| Abstract: |
Gravitational wave (GW) backgrounds of cosmological origin are expected to be nearly isotropic, with small anisotropies resembling those of the cosmic microwave background. We analyse the case of a scalar-induced GW background and clarify in the process the relation between two different approaches to calculating GW anisotropies. We focus on GW scenarios sourced by a significantly peaked scalar spectrum, which are frequently considered in the context of primordial black holes production. We show that the resulting GW anisotropies are characterised by a distinct frequency dependence. We explore the observational consequences concentrating on a GW background enhanced in the frequency band of space-based GW detectors. We study the detectability of the signal through both cross-correlations among different space-based GW detectors, and among GW and CMB experiments. |
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| College: |
Faculty of Science and Engineering |
| Funders: |
M.F. would like to acknowledge support from the “Atracción de Talento” grant 2019-
T1/TIC15784, his work is partially supported 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. GT is partially funded by the STFC
grant ST/T000813/1 |
| Issue: |
01 |
| Start Page: |
018 |