Gravitational axiverse spectroscopy: seeing the forest for the axions

We consider inflationary models with multiple spectator axions coupled to dark gauge sectors via Chern-Simons (CS) terms. The energy injection into Abelian gauge fields from the axions engenders a multi-peak profile for scalar and tensor spectra. We highlight the constraining power of CMB spectral d...

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Autores: Dimastrogiovanni, E., Fasiello, M., Leedom, J.M., Putti, M., Westphal, A.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2024
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/382691
Acceso en línea:http://hdl.handle.net/10261/382691
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85201303432&doi=10.1007%2fJHEP08%282024%29072&partnerID=40&md5=08653057e88745eaf2097a765989b87a
Access Level:acceso abierto
Palabra clave:Axions and ALPs
Cosmological models
String and Brane Phenomenology
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spelling Gravitational axiverse spectroscopy: seeing the forest for the axionsDimastrogiovanni, E.Fasiello, M.Leedom, J.M.Putti, M.Westphal, A.Axions and ALPsCosmological modelsString and Brane PhenomenologyWe consider inflationary models with multiple spectator axions coupled to dark gauge sectors via Chern-Simons (CS) terms. The energy injection into Abelian gauge fields from the axions engenders a multi-peak profile for scalar and tensor spectra. We highlight the constraining power of CMB spectral distortions on the scalar signal and discuss the conditions under which spectator sectors can account for the recently observed stochastic gravitational wave (GW) background in the nHz range. Given the tantalizing prospect of a multi-peak “GW forest” spanning several decades in frequency, we elaborate on possible ultraviolet origins of the spectator models from Type IIB orientifolds. String compactifications generically produce a multitude of axions, the “Axiverse”, from dimensional reduction of p-form gauge fields. The CS coupling of such axions to dark gauge fields in the worldvolume theory of D7-branes can be tuned via multiple brane wrappings and/or quantized gauge field strengths. If string axions coupled to Abelian gauge fields undergo slow-roll during inflation, they produce GW signals with peaked frequency distribution whose magnitude depends on the details of the compactification. We discuss the restrictions on spectator models from consistency and control requirements of the string compactification and thereby motivate models that may live in the string landscape as opposed to the swampland. © The Author(s) 2024.We would like to thank Rafael Álvarez-García, Alessandro Mininno, and Timo Weigand for many useful discussions. We also thank Timo Weigand for comments on the draft. ED and MF are indebted to Ogan Özsoy and Alex Papageorgiou for fruitful discussions. M. P. and J.M.L. would like to thank the University of Groningen for their hospitality during the completion of this work. J.M.L. and M.P. are supported by the Deutsche Forschungsgemeinschaft under Germany’s Excellence Strategy — EXC 2121 “Quantum Universe” — 390833306. MF acknowledges support from the “Ramón y Cajal” grant RYC2021-033786-I and the “Consolidación Investigadora” grant CNS2022-135590. MF’s 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. ED would like to acknowledge the Beate Naroska guest professorship programme of the Quantum Universe Cluster of Excellence at the University of Hamburg, and to thank the DESY Theory Group for warm hospitality whilst this work was in progress.Peer reviewedSpringer NatureMinisterio de Ciencia e Innovación (España)Agencia Estatal de Investigación (España)German Research FoundationUniversity of HamburgConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252024info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/382691https://www.scopus.com/inward/record.uri?eid=2-s2.0-85201303432&doi=10.1007%2fJHEP08%282024%29072&partnerID=40&md5=08653057e88745eaf2097a765989b87areponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI//CEX2020-001007-Sinfo:eu-repo/grantAgreement/AEI//RYC2021-033786-Iinfo:eu-repo/grantAgreement/AEI//CNS2022-135590https://doi.org/10.1007/JHEP08(2024)072Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3826912026-05-22T06:33:51Z
dc.title.none.fl_str_mv Gravitational axiverse spectroscopy: seeing the forest for the axions
title Gravitational axiverse spectroscopy: seeing the forest for the axions
spellingShingle Gravitational axiverse spectroscopy: seeing the forest for the axions
Dimastrogiovanni, E.
Axions and ALPs
Cosmological models
String and Brane Phenomenology
title_short Gravitational axiverse spectroscopy: seeing the forest for the axions
title_full Gravitational axiverse spectroscopy: seeing the forest for the axions
title_fullStr Gravitational axiverse spectroscopy: seeing the forest for the axions
title_full_unstemmed Gravitational axiverse spectroscopy: seeing the forest for the axions
title_sort Gravitational axiverse spectroscopy: seeing the forest for the axions
dc.creator.none.fl_str_mv Dimastrogiovanni, E.
Fasiello, M.
Leedom, J.M.
Putti, M.
Westphal, A.
author Dimastrogiovanni, E.
author_facet Dimastrogiovanni, E.
Fasiello, M.
Leedom, J.M.
Putti, M.
Westphal, A.
author_role author
author2 Fasiello, M.
Leedom, J.M.
Putti, M.
Westphal, A.
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia e Innovación (España)
Agencia Estatal de Investigación (España)
German Research Foundation
University of Hamburg
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Axions and ALPs
Cosmological models
String and Brane Phenomenology
topic Axions and ALPs
Cosmological models
String and Brane Phenomenology
description We consider inflationary models with multiple spectator axions coupled to dark gauge sectors via Chern-Simons (CS) terms. The energy injection into Abelian gauge fields from the axions engenders a multi-peak profile for scalar and tensor spectra. We highlight the constraining power of CMB spectral distortions on the scalar signal and discuss the conditions under which spectator sectors can account for the recently observed stochastic gravitational wave (GW) background in the nHz range. Given the tantalizing prospect of a multi-peak “GW forest” spanning several decades in frequency, we elaborate on possible ultraviolet origins of the spectator models from Type IIB orientifolds. String compactifications generically produce a multitude of axions, the “Axiverse”, from dimensional reduction of p-form gauge fields. The CS coupling of such axions to dark gauge fields in the worldvolume theory of D7-branes can be tuned via multiple brane wrappings and/or quantized gauge field strengths. If string axions coupled to Abelian gauge fields undergo slow-roll during inflation, they produce GW signals with peaked frequency distribution whose magnitude depends on the details of the compactification. We discuss the restrictions on spectator models from consistency and control requirements of the string compactification and thereby motivate models that may live in the string landscape as opposed to the swampland. © The Author(s) 2024.
publishDate 2024
dc.date.none.fl_str_mv 2024
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
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format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/382691
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85201303432&doi=10.1007%2fJHEP08%282024%29072&partnerID=40&md5=08653057e88745eaf2097a765989b87a
url http://hdl.handle.net/10261/382691
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85201303432&doi=10.1007%2fJHEP08%282024%29072&partnerID=40&md5=08653057e88745eaf2097a765989b87a
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
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info:eu-repo/grantAgreement/AEI//RYC2021-033786-I
info:eu-repo/grantAgreement/AEI//CNS2022-135590
https://doi.org/10.1007/JHEP08(2024)072
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
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dc.publisher.none.fl_str_mv Springer Nature
publisher.none.fl_str_mv Springer Nature
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
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