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Bridging the gap: spectral distortions meet gravitational waves
ABSTRACT Gravitational waves (GWs) have the potential to probe the entirety of cosmological history due to their nearly perfect decoupling from the thermal bath and any intervening matter after emission. In recent years, GW cosmology has evolved from merely being an exciting prospect to an actively...
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Published in: | Monthly notices of the Royal Astronomical Society 2021-08, Vol.505 (3), p.4396-4405 |
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creator | Kite, Thomas Ravenni, Andrea Patil, Subodh P Chluba, Jens |
description | ABSTRACT
Gravitational waves (GWs) have the potential to probe the entirety of cosmological history due to their nearly perfect decoupling from the thermal bath and any intervening matter after emission. In recent years, GW cosmology has evolved from merely being an exciting prospect to an actively pursued avenue for discovery, and the early results are very promising. As we highlight in this paper, spectral distortions (SDs) of the cosmic microwave background (CMB) uniquely probe GWs over six decades in frequency, bridging the gap between astrophysical high- and cosmological low-frequency measurements. This means SDs will not only complement other GW observations, but will be the sole probe of physical processes at certain scales. To illustrate this point, we explore the constraining power of various proposed SD missions on a number of phenomenological scenarios: early-universe phase transitions (PTs), GW production via the dynamics of SU(2) and ultralight U(1) axions, and cosmic string (CS) network collapse. We highlight how some regions of parameter space were already excluded with data from COBE/FIRAS , taken over two decades ago. To facilitate the implementation of SD constraints in arbitrary models, we provide GW2SD. This tool calculates the window function, which easily maps a GW spectrum to an SD amplitude, thus opening another portal for GW cosmology with SDs, with wide reaching implications for particle physics phenomenology. |
doi_str_mv | 10.1093/mnras/stab1558 |
format | article |
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Gravitational waves (GWs) have the potential to probe the entirety of cosmological history due to their nearly perfect decoupling from the thermal bath and any intervening matter after emission. In recent years, GW cosmology has evolved from merely being an exciting prospect to an actively pursued avenue for discovery, and the early results are very promising. As we highlight in this paper, spectral distortions (SDs) of the cosmic microwave background (CMB) uniquely probe GWs over six decades in frequency, bridging the gap between astrophysical high- and cosmological low-frequency measurements. This means SDs will not only complement other GW observations, but will be the sole probe of physical processes at certain scales. To illustrate this point, we explore the constraining power of various proposed SD missions on a number of phenomenological scenarios: early-universe phase transitions (PTs), GW production via the dynamics of SU(2) and ultralight U(1) axions, and cosmic string (CS) network collapse. We highlight how some regions of parameter space were already excluded with data from COBE/FIRAS , taken over two decades ago. To facilitate the implementation of SD constraints in arbitrary models, we provide GW2SD. This tool calculates the window function, which easily maps a GW spectrum to an SD amplitude, thus opening another portal for GW cosmology with SDs, with wide reaching implications for particle physics phenomenology.</description><identifier>ISSN: 0035-8711</identifier><identifier>EISSN: 1365-2966</identifier><identifier>DOI: 10.1093/mnras/stab1558</identifier><language>eng</language><publisher>Oxford University Press</publisher><ispartof>Monthly notices of the Royal Astronomical Society, 2021-08, Vol.505 (3), p.4396-4405</ispartof><rights>2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society 2021</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c339t-245f7d995105c047fae30c3c84466f1c378c7d11b36f7fd65b22ddfe9b95cc3</citedby><cites>FETCH-LOGICAL-c339t-245f7d995105c047fae30c3c84466f1c378c7d11b36f7fd65b22ddfe9b95cc3</cites><orcidid>0000-0003-3725-6096 ; 0000-0003-3582-6913</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,1604,27924,27925</link.rule.ids><linktorsrc>$$Uhttps://dx.doi.org/10.1093/mnras/stab1558$$EView_record_in_Oxford_University_Press$$FView_record_in_$$GOxford_University_Press</linktorsrc></links><search><creatorcontrib>Kite, Thomas</creatorcontrib><creatorcontrib>Ravenni, Andrea</creatorcontrib><creatorcontrib>Patil, Subodh P</creatorcontrib><creatorcontrib>Chluba, Jens</creatorcontrib><title>Bridging the gap: spectral distortions meet gravitational waves</title><title>Monthly notices of the Royal Astronomical Society</title><description>ABSTRACT
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title | Bridging the gap: spectral distortions meet gravitational waves |
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