Age constraints and fine tuning in variable-mass particle models
Autor(a) principal: | |
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Data de Publicação: | 2004 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1103/PhysRevD.69.063517 http://hdl.handle.net/11449/224584 |
Resumo: | VAMP (variable-mass particle) scenarios, in which the mass of the cold dark matter particles is a function of the scalar field responsible for the present acceleration of the Universe, have been proposed as a solution to the cosmic coincidence problem, since in the attractor regime both dark energy and dark matter scale in the same way. We find that only a narrow region in parameter space leads to models with viable values for the Hubble constant and dark energy density today. In the allowed region, the dark energy density starts to dominate around the present epoch and consequently such models cannot solve the coincidence problem. We show that the age of the Universe in this scenario is considerably higher than the age for noncoupled dark energy models, and conclude that more precise independent measurements of the age of the Universe would be useful in distinguishing between coupled and noncoupled dark energy models. © 2004 The American Physical Society. |
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Age constraints and fine tuning in variable-mass particle modelsVAMP (variable-mass particle) scenarios, in which the mass of the cold dark matter particles is a function of the scalar field responsible for the present acceleration of the Universe, have been proposed as a solution to the cosmic coincidence problem, since in the attractor regime both dark energy and dark matter scale in the same way. We find that only a narrow region in parameter space leads to models with viable values for the Hubble constant and dark energy density today. In the allowed region, the dark energy density starts to dominate around the present epoch and consequently such models cannot solve the coincidence problem. We show that the age of the Universe in this scenario is considerably higher than the age for noncoupled dark energy models, and conclude that more precise independent measurements of the age of the Universe would be useful in distinguishing between coupled and noncoupled dark energy models. © 2004 The American Physical Society.Instituto de Física Teórica–UNESP, Rua Pamplona 145, São Paulo, 01405-900Instituto de Física Teórica–UNESP, Rua Pamplona 145, São Paulo, 01405-900Universidade Estadual Paulista (UNESP)França, Urbano [UNESP]Rosenfeld, Rogerio [UNESP]2022-04-28T20:01:16Z2022-04-28T20:01:16Z2004-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article6http://dx.doi.org/10.1103/PhysRevD.69.063517Physical Review D - Particles, Fields, Gravitation and Cosmology, v. 69, n. 6, p. 6-, 2004.1550-23681550-7998http://hdl.handle.net/11449/22458410.1103/PhysRevD.69.0635172-s2.0-2342442875Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengPhysical Review D - Particles, Fields, Gravitation and Cosmologyinfo:eu-repo/semantics/openAccess2022-04-28T20:01:16Zoai:repositorio.unesp.br:11449/224584Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T17:37:05.494040Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Age constraints and fine tuning in variable-mass particle models |
title |
Age constraints and fine tuning in variable-mass particle models |
spellingShingle |
Age constraints and fine tuning in variable-mass particle models França, Urbano [UNESP] |
title_short |
Age constraints and fine tuning in variable-mass particle models |
title_full |
Age constraints and fine tuning in variable-mass particle models |
title_fullStr |
Age constraints and fine tuning in variable-mass particle models |
title_full_unstemmed |
Age constraints and fine tuning in variable-mass particle models |
title_sort |
Age constraints and fine tuning in variable-mass particle models |
author |
França, Urbano [UNESP] |
author_facet |
França, Urbano [UNESP] Rosenfeld, Rogerio [UNESP] |
author_role |
author |
author2 |
Rosenfeld, Rogerio [UNESP] |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) |
dc.contributor.author.fl_str_mv |
França, Urbano [UNESP] Rosenfeld, Rogerio [UNESP] |
description |
VAMP (variable-mass particle) scenarios, in which the mass of the cold dark matter particles is a function of the scalar field responsible for the present acceleration of the Universe, have been proposed as a solution to the cosmic coincidence problem, since in the attractor regime both dark energy and dark matter scale in the same way. We find that only a narrow region in parameter space leads to models with viable values for the Hubble constant and dark energy density today. In the allowed region, the dark energy density starts to dominate around the present epoch and consequently such models cannot solve the coincidence problem. We show that the age of the Universe in this scenario is considerably higher than the age for noncoupled dark energy models, and conclude that more precise independent measurements of the age of the Universe would be useful in distinguishing between coupled and noncoupled dark energy models. © 2004 The American Physical Society. |
publishDate |
2004 |
dc.date.none.fl_str_mv |
2004-01-01 2022-04-28T20:01:16Z 2022-04-28T20:01:16Z |
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.uri.fl_str_mv |
http://dx.doi.org/10.1103/PhysRevD.69.063517 Physical Review D - Particles, Fields, Gravitation and Cosmology, v. 69, n. 6, p. 6-, 2004. 1550-2368 1550-7998 http://hdl.handle.net/11449/224584 10.1103/PhysRevD.69.063517 2-s2.0-2342442875 |
url |
http://dx.doi.org/10.1103/PhysRevD.69.063517 http://hdl.handle.net/11449/224584 |
identifier_str_mv |
Physical Review D - Particles, Fields, Gravitation and Cosmology, v. 69, n. 6, p. 6-, 2004. 1550-2368 1550-7998 10.1103/PhysRevD.69.063517 2-s2.0-2342442875 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Physical Review D - Particles, Fields, Gravitation and Cosmology |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
6 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128835313467392 |