Cosmological perturbations in coherent oscillating scalar field models

The fact that fast oscillating homogeneous scalar fields behave as perfect fluids in average and their intrinsic isotropy have made these models very fruitful in cosmology. In this work we will analyse the perturbations dynamics in these theories assuming general power law potentials V(ϕ) = λ|ϕ|^n /...

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Detalles Bibliográficos
Autores: Ruiz Cembranos, José Alberto, López Maroto, Antonio, Nuñez Jareño, Santos José
Tipo de recurso: artículo
Fecha de publicación:2016
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/24513
Acceso en línea:https://hdl.handle.net/20.500.14352/24513
Access Level:acceso abierto
Palabra clave:53
Cosmology of theories beyond the SM
Classical theories of gravity
Física (Física)
22 Física
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oai_identifier_str oai:docta.ucm.es:20.500.14352/24513
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spelling Cosmological perturbations in coherent oscillating scalar field modelsRuiz Cembranos, José AlbertoLópez Maroto, AntonioNuñez Jareño, Santos José53Cosmology of theories beyond the SMClassical theories of gravityFísica (Física)22 FísicaThe fact that fast oscillating homogeneous scalar fields behave as perfect fluids in average and their intrinsic isotropy have made these models very fruitful in cosmology. In this work we will analyse the perturbations dynamics in these theories assuming general power law potentials V(ϕ) = λ|ϕ|^n /n. At leading order in the wavenumber expansion, a simple expression for the effective sound speed of perturbations is obtained c_eff^ 2  = ω = (n − 2)/(n + 2) with ω the effective equation of state. We also obtain the first order correction in k^ 2/ω_eff^ 2 , when the wavenumber k of the perturbations is much smaller than the background oscillation frequency, ω_eff. For the standard massive case we have also analysed general anharmonic contributions to the effective sound speed. These results are reached through a perturbed version of the generalized virial theorem and also studying the exact system both in the super-Hubble limit, deriving the natural ansatz for δϕ; and for sub-Hubble modes, exploiting Floquet’s theorem.SpringerUniversidad Complutense de Madrid20162016-03-0320162016-03-03journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/24513reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Atribución 3.0 Españahttps://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/245132026-06-02T12:44:21Z
dc.title.none.fl_str_mv Cosmological perturbations in coherent oscillating scalar field models
title Cosmological perturbations in coherent oscillating scalar field models
spellingShingle Cosmological perturbations in coherent oscillating scalar field models
Ruiz Cembranos, José Alberto
53
Cosmology of theories beyond the SM
Classical theories of gravity
Física (Física)
22 Física
title_short Cosmological perturbations in coherent oscillating scalar field models
title_full Cosmological perturbations in coherent oscillating scalar field models
title_fullStr Cosmological perturbations in coherent oscillating scalar field models
title_full_unstemmed Cosmological perturbations in coherent oscillating scalar field models
title_sort Cosmological perturbations in coherent oscillating scalar field models
dc.creator.none.fl_str_mv Ruiz Cembranos, José Alberto
López Maroto, Antonio
Nuñez Jareño, Santos José
author Ruiz Cembranos, José Alberto
author_facet Ruiz Cembranos, José Alberto
López Maroto, Antonio
Nuñez Jareño, Santos José
author_role author
author2 López Maroto, Antonio
Nuñez Jareño, Santos José
author2_role author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 53
Cosmology of theories beyond the SM
Classical theories of gravity
Física (Física)
22 Física
topic 53
Cosmology of theories beyond the SM
Classical theories of gravity
Física (Física)
22 Física
description The fact that fast oscillating homogeneous scalar fields behave as perfect fluids in average and their intrinsic isotropy have made these models very fruitful in cosmology. In this work we will analyse the perturbations dynamics in these theories assuming general power law potentials V(ϕ) = λ|ϕ|^n /n. At leading order in the wavenumber expansion, a simple expression for the effective sound speed of perturbations is obtained c_eff^ 2  = ω = (n − 2)/(n + 2) with ω the effective equation of state. We also obtain the first order correction in k^ 2/ω_eff^ 2 , when the wavenumber k of the perturbations is much smaller than the background oscillation frequency, ω_eff. For the standard massive case we have also analysed general anharmonic contributions to the effective sound speed. These results are reached through a perturbed version of the generalized virial theorem and also studying the exact system both in the super-Hubble limit, deriving the natural ansatz for δϕ; and for sub-Hubble modes, exploiting Floquet’s theorem.
publishDate 2016
dc.date.none.fl_str_mv 2016
2016-03-03
2016
2016-03-03
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/24513
url https://hdl.handle.net/20.500.14352/24513
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución 3.0 España
https://creativecommons.org/licenses/by/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución 3.0 España
https://creativecommons.org/licenses/by/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Springer
publisher.none.fl_str_mv Springer
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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