Time variation of the fine structure constant in the early universe and the Bekenstein model
- Autores
- Mosquera, Mercedes Elisa; Scóccola, Claudia Graciela; Landau, Susana Judith; Vucetich, Héctor
- Año de publicación
- 2008
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Aims.We calculate the bounds on the variation in the fine structure constant at the time of primordial nucleosynthesis and at the time of neutral hydrogen formation. We used these bounds and other bounds from the late universe to test the Bekenstein model. Methods.We modified the Kawano code, CAMB, and CosmoMC to include the possible variation in the fine structure constant. We used observational primordial abundances of D, 4He, and 7Li, recent data from the cosmic microwave background, and the 2dFGRS power spectrum, to obtain bounds on the variation in α. We calculated a piecewise solution to the scalar field equation of the Bekenstein model in two different regimes: i) matter and radiation, ii) matter and cosmological constant. We match both solutions with the appropriate boundary conditions. We performed a statistical analysis, using the bounds obtained from the early universe and other bounds from the late universe to constrain the free parameters of the model. Results.Results are consistent with no variation in α for the early universe. Limits on α are inconsistent with the scale length of the theory being larger than the Planck scale.Conclusions.In order to fit all observational and experimental data, the assumption l>Lp implied in Bekenstein's model has to be relaxed.
Facultad de Ciencias Astronómicas y Geofísicas
Instituto de Astrofísica de La Plata - Materia
-
Ciencias Astronómicas
Cosmic microwave background
Cosmology: theory
Early Universe - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by-nc-sa/4.0/
- Repositorio
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/83101
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Time variation of the fine structure constant in the early universe and the Bekenstein modelMosquera, Mercedes ElisaScóccola, Claudia GracielaLandau, Susana JudithVucetich, HéctorCiencias AstronómicasCosmic microwave backgroundCosmology: theoryEarly UniverseAims.We calculate the bounds on the variation in the fine structure constant at the time of primordial nucleosynthesis and at the time of neutral hydrogen formation. We used these bounds and other bounds from the late universe to test the Bekenstein model. Methods.We modified the Kawano code, CAMB, and CosmoMC to include the possible variation in the fine structure constant. We used observational primordial abundances of D, <SUP>4</SUP>He, and <SUP>7</SUP>Li, recent data from the cosmic microwave background, and the 2dFGRS power spectrum, to obtain bounds on the variation in α. We calculated a piecewise solution to the scalar field equation of the Bekenstein model in two different regimes: i) matter and radiation, ii) matter and cosmological constant. We match both solutions with the appropriate boundary conditions. We performed a statistical analysis, using the bounds obtained from the early universe and other bounds from the late universe to constrain the free parameters of the model. Results.Results are consistent with no variation in α for the early universe. Limits on α are inconsistent with the scale length of the theory being larger than the Planck scale.Conclusions.In order to fit all observational and experimental data, the assumption l>L<SUB>p</SUB> implied in Bekenstein's model has to be relaxed.Facultad de Ciencias Astronómicas y GeofísicasInstituto de Astrofísica de La Plata2008info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf675-684http://sedici.unlp.edu.ar/handle/10915/83101enginfo:eu-repo/semantics/altIdentifier/issn/0004-6361info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20078605info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:15:41Zoai:sedici.unlp.edu.ar:10915/83101Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:15:41.331SEDICI (UNLP) - Universidad Nacional de La Platafalse |
dc.title.none.fl_str_mv |
Time variation of the fine structure constant in the early universe and the Bekenstein model |
title |
Time variation of the fine structure constant in the early universe and the Bekenstein model |
spellingShingle |
Time variation of the fine structure constant in the early universe and the Bekenstein model Mosquera, Mercedes Elisa Ciencias Astronómicas Cosmic microwave background Cosmology: theory Early Universe |
title_short |
Time variation of the fine structure constant in the early universe and the Bekenstein model |
title_full |
Time variation of the fine structure constant in the early universe and the Bekenstein model |
title_fullStr |
Time variation of the fine structure constant in the early universe and the Bekenstein model |
title_full_unstemmed |
Time variation of the fine structure constant in the early universe and the Bekenstein model |
title_sort |
Time variation of the fine structure constant in the early universe and the Bekenstein model |
dc.creator.none.fl_str_mv |
Mosquera, Mercedes Elisa Scóccola, Claudia Graciela Landau, Susana Judith Vucetich, Héctor |
author |
Mosquera, Mercedes Elisa |
author_facet |
Mosquera, Mercedes Elisa Scóccola, Claudia Graciela Landau, Susana Judith Vucetich, Héctor |
author_role |
author |
author2 |
Scóccola, Claudia Graciela Landau, Susana Judith Vucetich, Héctor |
author2_role |
author author author |
dc.subject.none.fl_str_mv |
Ciencias Astronómicas Cosmic microwave background Cosmology: theory Early Universe |
topic |
Ciencias Astronómicas Cosmic microwave background Cosmology: theory Early Universe |
dc.description.none.fl_txt_mv |
Aims.We calculate the bounds on the variation in the fine structure constant at the time of primordial nucleosynthesis and at the time of neutral hydrogen formation. We used these bounds and other bounds from the late universe to test the Bekenstein model. Methods.We modified the Kawano code, CAMB, and CosmoMC to include the possible variation in the fine structure constant. We used observational primordial abundances of D, <SUP>4</SUP>He, and <SUP>7</SUP>Li, recent data from the cosmic microwave background, and the 2dFGRS power spectrum, to obtain bounds on the variation in α. We calculated a piecewise solution to the scalar field equation of the Bekenstein model in two different regimes: i) matter and radiation, ii) matter and cosmological constant. We match both solutions with the appropriate boundary conditions. We performed a statistical analysis, using the bounds obtained from the early universe and other bounds from the late universe to constrain the free parameters of the model. Results.Results are consistent with no variation in α for the early universe. Limits on α are inconsistent with the scale length of the theory being larger than the Planck scale.Conclusions.In order to fit all observational and experimental data, the assumption l>L<SUB>p</SUB> implied in Bekenstein's model has to be relaxed. Facultad de Ciencias Astronómicas y Geofísicas Instituto de Astrofísica de La Plata |
description |
Aims.We calculate the bounds on the variation in the fine structure constant at the time of primordial nucleosynthesis and at the time of neutral hydrogen formation. We used these bounds and other bounds from the late universe to test the Bekenstein model. Methods.We modified the Kawano code, CAMB, and CosmoMC to include the possible variation in the fine structure constant. We used observational primordial abundances of D, <SUP>4</SUP>He, and <SUP>7</SUP>Li, recent data from the cosmic microwave background, and the 2dFGRS power spectrum, to obtain bounds on the variation in α. We calculated a piecewise solution to the scalar field equation of the Bekenstein model in two different regimes: i) matter and radiation, ii) matter and cosmological constant. We match both solutions with the appropriate boundary conditions. We performed a statistical analysis, using the bounds obtained from the early universe and other bounds from the late universe to constrain the free parameters of the model. Results.Results are consistent with no variation in α for the early universe. Limits on α are inconsistent with the scale length of the theory being larger than the Planck scale.Conclusions.In order to fit all observational and experimental data, the assumption l>L<SUB>p</SUB> implied in Bekenstein's model has to be relaxed. |
publishDate |
2008 |
dc.date.none.fl_str_mv |
2008 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Articulo http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
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article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://sedici.unlp.edu.ar/handle/10915/83101 |
url |
http://sedici.unlp.edu.ar/handle/10915/83101 |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/issn/0004-6361 info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20078605 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
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openAccess |
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http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
dc.format.none.fl_str_mv |
application/pdf 675-684 |
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