Time variation of the fine structure constant in the early universe and the Bekenstein model

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,...

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Autores principales: Mosquera, Mercedes Elisa, Scóccola, Claudia Graciela, Landau, Susana Judith, Vucetich, Héctor
Formato: Articulo
Lenguaje:Inglés
Publicado: 2008
Materias:
Ciencias Astronómicas
Cosmic microwave background
Cosmology: theory
Early Universe
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83101
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83101
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Cosmic microwave background
Cosmology: theory
Early Universe
spellingShingle Ciencias Astronómicas
Cosmic microwave background
Cosmology: theory
Early Universe
Mosquera, Mercedes Elisa
Scóccola, Claudia Graciela
Landau, Susana Judith
Vucetich, Héctor
Time variation of the fine structure constant in the early universe and the Bekenstein model
topic_facet Ciencias Astronómicas
Cosmic microwave background
Cosmology: theory
Early Universe
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.
format Articulo
Articulo
author Mosquera, Mercedes Elisa
Scóccola, Claudia Graciela
Landau, Susana Judith
Vucetich, Héctor
author_facet Mosquera, Mercedes Elisa
Scóccola, Claudia Graciela
Landau, Susana Judith
Vucetich, Héctor
author_sort Mosquera, Mercedes Elisa
title Time variation of the fine structure constant in the early universe and the Bekenstein model
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
publishDate 2008
url http://sedici.unlp.edu.ar/handle/10915/83101
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AT landaususanajudith timevariationofthefinestructureconstantintheearlyuniverseandthebekensteinmodel
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