Particle creation from non-geodesic trajectories in multifield inflation

Particle production in de Sitter spacetime arises from the exponential expansion of space, rendering the Bunch-Davies vacuum perceived as a particle-containing state by late-time observers. For states defined as eigenstates of both momentum and the Hamiltonian, the Bunch-Davies vacuum exhibits a con...

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Autores: Parra, N., Sypsas, S., Palma, G.A., Zenteno, C.
Formato: artículo
Estado:Versión enviada para evaluación y publicación
Fecha de publicación:2025
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:dnet:digitalcsic_::a98f4f452b6e42a95b40bb90426df4d0
Acesso em linha:http://hdl.handle.net/10261/429175
https://www.scopus.com/pages/publications/105002781325?origin=resultslist
Access Level:acceso abierto
Palavra-chave:physics of the early universe
quantum field theory on curved space
Quantum fields in curved spacetimes
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spelling Particle creation from non-geodesic trajectories in multifield inflationParra, N.Sypsas, S.Palma, G.A.Zenteno, C.physics of the early universequantum field theory on curved spaceQuantum fields in curved spacetimesParticle production in de Sitter spacetime arises from the exponential expansion of space, rendering the Bunch-Davies vacuum perceived as a particle-containing state by late-time observers. For states defined as eigenstates of both momentum and the Hamiltonian, the Bunch-Davies vacuum exhibits a constant particle density per physical momentum. We explore particle production beyond this baseline, focusing on deviations from exact de Sitter conditions and non-gravitational interactions, such as slow-roll inflation or interactions arising from the coupling of inflation to other fields. Using Bogoliubov transformations, we calculate the number density of energy/momentum eigenstates. In single-field inflation, this density captures the observed spectral index of the primordial power spectrum, while in two-field models, it reflects the non-gravitational coupling driving background trajectory turning. We present analytical results applicable to various scenarios involving particle production from non-adiabatic processes during inflation. © 2025 IOP Publishing Ltd and Sissa Medialab. All rights, including for text and data mining, AI training, and similar technologies, are reserved.GAP and NP acknowledge support from the Fondecyt Regular project number 1210876 (ANID). SS is supported by Thailand NSRF via PMU-B [grant number B37G660013].Peer reviewedIOP PublishingConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202620262025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Preprintinfo:eu-repo/semantics/submittedVersionhttp://hdl.handle.net/10261/429175https://www.scopus.com/pages/publications/105002781325?origin=resultslistreponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésJournal of Cosmology and Astroparticle PhysicsSíinfo:eu-repo/semantics/openAccessoai:dnet:digitalcsic_::a98f4f452b6e42a95b40bb90426df4d02026-05-22T06:33:51Z
dc.title.none.fl_str_mv Particle creation from non-geodesic trajectories in multifield inflation
title Particle creation from non-geodesic trajectories in multifield inflation
spellingShingle Particle creation from non-geodesic trajectories in multifield inflation
Parra, N.
physics of the early universe
quantum field theory on curved space
Quantum fields in curved spacetimes
title_short Particle creation from non-geodesic trajectories in multifield inflation
title_full Particle creation from non-geodesic trajectories in multifield inflation
title_fullStr Particle creation from non-geodesic trajectories in multifield inflation
title_full_unstemmed Particle creation from non-geodesic trajectories in multifield inflation
title_sort Particle creation from non-geodesic trajectories in multifield inflation
dc.creator.none.fl_str_mv Parra, N.
Sypsas, S.
Palma, G.A.
Zenteno, C.
author Parra, N.
author_facet Parra, N.
Sypsas, S.
Palma, G.A.
Zenteno, C.
author_role author
author2 Sypsas, S.
Palma, G.A.
Zenteno, C.
author2_role author
author
author
dc.contributor.none.fl_str_mv Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv physics of the early universe
quantum field theory on curved space
Quantum fields in curved spacetimes
topic physics of the early universe
quantum field theory on curved space
Quantum fields in curved spacetimes
description Particle production in de Sitter spacetime arises from the exponential expansion of space, rendering the Bunch-Davies vacuum perceived as a particle-containing state by late-time observers. For states defined as eigenstates of both momentum and the Hamiltonian, the Bunch-Davies vacuum exhibits a constant particle density per physical momentum. We explore particle production beyond this baseline, focusing on deviations from exact de Sitter conditions and non-gravitational interactions, such as slow-roll inflation or interactions arising from the coupling of inflation to other fields. Using Bogoliubov transformations, we calculate the number density of energy/momentum eigenstates. In single-field inflation, this density captures the observed spectral index of the primordial power spectrum, while in two-field models, it reflects the non-gravitational coupling driving background trajectory turning. We present analytical results applicable to various scenarios involving particle production from non-adiabatic processes during inflation. © 2025 IOP Publishing Ltd and Sissa Medialab. All rights, including for text and data mining, AI training, and similar technologies, are reserved.
publishDate 2025
dc.date.none.fl_str_mv 2025
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Preprint
info:eu-repo/semantics/submittedVersion
format article
status_str submittedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/429175
https://www.scopus.com/pages/publications/105002781325?origin=resultslist
url http://hdl.handle.net/10261/429175
https://www.scopus.com/pages/publications/105002781325?origin=resultslist
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Journal of Cosmology and Astroparticle Physics
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv IOP Publishing
publisher.none.fl_str_mv IOP Publishing
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)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.812429

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