Analytic study of cosmological perturbations in a unified model of dark matter and dark energy with a sharp transition
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRN |
Texto Completo: | https://repositorio.ufrn.br/jspui/handle/123456789/29906 |
Resumo: | We study cosmological perturbations in a model of unified dark matter and dark energy with a sharp transition in the late-time universe. The dark sector is described by a dark fluid which evolves from an early stage at redshifts z > zC when it behaves as cold dark matter (CDM) to a late time dark energy (DE) phase (z < zC ) when the equation of state parameter is w = −1 + ,with a constant which must be in the range 0 < < 2/3. We show that fluctuations in the dark energy phase suffer from an exponential instability, the mode functions growing both as a function of comoving momentum k and of conformal time η. In order that this exponential instability does not lead to distortions of the energy density power spectrum on scales for which we have good observational results, the redshift zC of transition between the two phases is constrained to be so close to zero that the model is unable to explain the supernova data |
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Medeiros, Léo GouvêaCuzinatto, R.R.Morais, Eduardo M. deBrandenberger, Robert H.2020-08-28T17:23:03Z2020-08-28T17:23:03Z2018-12CUZINATTO, Rodrigo R.; MEDEIROS, Léo G.; MORAIS, Eduardo M. de; BRANDENBERGER, Robert H.. Analytic study of cosmological perturbations in a unified model of dark matter and dark energy with a sharp transition. Astroparticle Physics, [s.l.], v. 103, p. 98-107, dez. 2018. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S0927650518301269?via%3Dihub. Acesso em: 12 ago. 2020. http://dx.doi.org/10.1016/j.astropartphys.2018.07.005.0927-6505https://repositorio.ufrn.br/jspui/handle/123456789/2990610.1016/j.astropartphys.2018.07.005ElsevierCosmological PerturbationsSharp TransitionDark MatterDark EnergyAnalytic study of cosmological perturbations in a unified model of dark matter and dark energy with a sharp transitioninfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleWe study cosmological perturbations in a model of unified dark matter and dark energy with a sharp transition in the late-time universe. The dark sector is described by a dark fluid which evolves from an early stage at redshifts z > zC when it behaves as cold dark matter (CDM) to a late time dark energy (DE) phase (z < zC ) when the equation of state parameter is w = −1 + ,with a constant which must be in the range 0 < < 2/3. We show that fluctuations in the dark energy phase suffer from an exponential instability, the mode functions growing both as a function of comoving momentum k and of conformal time η. In order that this exponential instability does not lead to distortions of the energy density power spectrum on scales for which we have good observational results, the redshift zC of transition between the two phases is constrained to be so close to zero that the model is unable to explain the supernova dataengreponame:Repositório Institucional da UFRNinstname:Universidade Federal do Rio Grande do Norte (UFRN)instacron:UFRNinfo:eu-repo/semantics/openAccessCC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; charset=utf-8914https://repositorio.ufrn.br/bitstream/123456789/29906/2/license_rdf4d2950bda3d176f570a9f8b328dfbbefMD52LICENSElicense.txtlicense.txttext/plain; charset=utf-81484https://repositorio.ufrn.br/bitstream/123456789/29906/3/license.txte9597aa2854d128fd968be5edc8a28d9MD53TEXTAnalyticStudyCosmological_MEDEIROS_2018.pdf.txtAnalyticStudyCosmological_MEDEIROS_2018.pdf.txtExtracted texttext/plain59825https://repositorio.ufrn.br/bitstream/123456789/29906/4/AnalyticStudyCosmological_MEDEIROS_2018.pdf.txtd74dd7d766b2a497751dabe3c8d7eec9MD54THUMBNAILAnalyticStudyCosmological_MEDEIROS_2018.pdf.jpgAnalyticStudyCosmological_MEDEIROS_2018.pdf.jpgGenerated Thumbnailimage/jpeg1657https://repositorio.ufrn.br/bitstream/123456789/29906/5/AnalyticStudyCosmological_MEDEIROS_2018.pdf.jpg462eabb18980078cb8e4456b986a4f7bMD55123456789/299062022-12-15 18:49:16.348oai:https://repositorio.ufrn.br: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Repositório de PublicaçõesPUBhttp://repositorio.ufrn.br/oai/opendoar:2022-12-15T21:49:16Repositório Institucional da UFRN - Universidade Federal do Rio Grande do Norte (UFRN)false |
dc.title.pt_BR.fl_str_mv |
Analytic study of cosmological perturbations in a unified model of dark matter and dark energy with a sharp transition |
title |
Analytic study of cosmological perturbations in a unified model of dark matter and dark energy with a sharp transition |
spellingShingle |
Analytic study of cosmological perturbations in a unified model of dark matter and dark energy with a sharp transition Medeiros, Léo Gouvêa Cosmological Perturbations Sharp Transition Dark Matter Dark Energy |
title_short |
Analytic study of cosmological perturbations in a unified model of dark matter and dark energy with a sharp transition |
title_full |
Analytic study of cosmological perturbations in a unified model of dark matter and dark energy with a sharp transition |
title_fullStr |
Analytic study of cosmological perturbations in a unified model of dark matter and dark energy with a sharp transition |
title_full_unstemmed |
Analytic study of cosmological perturbations in a unified model of dark matter and dark energy with a sharp transition |
title_sort |
Analytic study of cosmological perturbations in a unified model of dark matter and dark energy with a sharp transition |
author |
Medeiros, Léo Gouvêa |
author_facet |
Medeiros, Léo Gouvêa Cuzinatto, R.R. Morais, Eduardo M. de Brandenberger, Robert H. |
author_role |
author |
author2 |
Cuzinatto, R.R. Morais, Eduardo M. de Brandenberger, Robert H. |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Medeiros, Léo Gouvêa Cuzinatto, R.R. Morais, Eduardo M. de Brandenberger, Robert H. |
dc.subject.por.fl_str_mv |
Cosmological Perturbations Sharp Transition Dark Matter Dark Energy |
topic |
Cosmological Perturbations Sharp Transition Dark Matter Dark Energy |
description |
We study cosmological perturbations in a model of unified dark matter and dark energy with a sharp transition in the late-time universe. The dark sector is described by a dark fluid which evolves from an early stage at redshifts z > zC when it behaves as cold dark matter (CDM) to a late time dark energy (DE) phase (z < zC ) when the equation of state parameter is w = −1 + ,with a constant which must be in the range 0 < < 2/3. We show that fluctuations in the dark energy phase suffer from an exponential instability, the mode functions growing both as a function of comoving momentum k and of conformal time η. In order that this exponential instability does not lead to distortions of the energy density power spectrum on scales for which we have good observational results, the redshift zC of transition between the two phases is constrained to be so close to zero that the model is unable to explain the supernova data |
publishDate |
2018 |
dc.date.issued.fl_str_mv |
2018-12 |
dc.date.accessioned.fl_str_mv |
2020-08-28T17:23:03Z |
dc.date.available.fl_str_mv |
2020-08-28T17:23:03Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
CUZINATTO, Rodrigo R.; MEDEIROS, Léo G.; MORAIS, Eduardo M. de; BRANDENBERGER, Robert H.. Analytic study of cosmological perturbations in a unified model of dark matter and dark energy with a sharp transition. Astroparticle Physics, [s.l.], v. 103, p. 98-107, dez. 2018. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S0927650518301269?via%3Dihub. Acesso em: 12 ago. 2020. http://dx.doi.org/10.1016/j.astropartphys.2018.07.005. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufrn.br/jspui/handle/123456789/29906 |
dc.identifier.issn.none.fl_str_mv |
0927-6505 |
dc.identifier.doi.none.fl_str_mv |
10.1016/j.astropartphys.2018.07.005 |
identifier_str_mv |
CUZINATTO, Rodrigo R.; MEDEIROS, Léo G.; MORAIS, Eduardo M. de; BRANDENBERGER, Robert H.. Analytic study of cosmological perturbations in a unified model of dark matter and dark energy with a sharp transition. Astroparticle Physics, [s.l.], v. 103, p. 98-107, dez. 2018. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S0927650518301269?via%3Dihub. Acesso em: 12 ago. 2020. http://dx.doi.org/10.1016/j.astropartphys.2018.07.005. 0927-6505 10.1016/j.astropartphys.2018.07.005 |
url |
https://repositorio.ufrn.br/jspui/handle/123456789/29906 |
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eng |
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eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
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reponame:Repositório Institucional da UFRN instname:Universidade Federal do Rio Grande do Norte (UFRN) instacron:UFRN |
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