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, a...

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Detalles Bibliográficos
Autor principal: Landau, Susana J.
Publicado: 2008
Materias:
Cosmic microwave background
Cosmology: theory
Early Universe
Boundary conditions
Data reduction
Mathematical models
Parameter estimation
Fine structure constant
Nucleosynthesis
Scalar field
Cosmology
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v478_n3_p675_Mosquera
http://hdl.handle.net/20.500.12110/paper_00046361_v478_n3_p675_Mosquera
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00046361_v478_n3_p675_Mosquera
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spelling paper:paper_00046361_v478_n3_p675_Mosquera2023-06-08T14:27:45Z Time variation of the fine structure constant in the early universe and the Bekenstein model Landau, Susana J. Cosmic microwave background Cosmology: theory Early Universe Boundary conditions Data reduction Mathematical models Parameter estimation Cosmic microwave background Fine structure constant Nucleosynthesis Scalar field Cosmology 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, He, and Li, recent data from the cosmic microwave background, and the 2dFGRS power spectrum, to obtain bounds on the variation in . 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 for the early universe. Limits on 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 > implied in Bekenstein's model has to be relaxed. © 2008 ESO. Fil:Landau, S.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v478_n3_p675_Mosquera http://hdl.handle.net/20.500.12110/paper_00046361_v478_n3_p675_Mosquera
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Cosmic microwave background
Cosmology: theory
Early Universe
Boundary conditions
Data reduction
Mathematical models
Parameter estimation
Cosmic microwave background
Fine structure constant
Nucleosynthesis
Scalar field
Cosmology
spellingShingle Cosmic microwave background
Cosmology: theory
Early Universe
Boundary conditions
Data reduction
Mathematical models
Parameter estimation
Cosmic microwave background
Fine structure constant
Nucleosynthesis
Scalar field
Cosmology
Landau, Susana J.
Time variation of the fine structure constant in the early universe and the Bekenstein model
topic_facet Cosmic microwave background
Cosmology: theory
Early Universe
Boundary conditions
Data reduction
Mathematical models
Parameter estimation
Cosmic microwave background
Fine structure constant
Nucleosynthesis
Scalar field
Cosmology
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, He, and Li, recent data from the cosmic microwave background, and the 2dFGRS power spectrum, to obtain bounds on the variation in . 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 for the early universe. Limits on 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 > implied in Bekenstein's model has to be relaxed. © 2008 ESO.
author Landau, Susana J.
author_facet Landau, Susana J.
author_sort Landau, Susana J.
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 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v478_n3_p675_Mosquera
http://hdl.handle.net/20.500.12110/paper_00046361_v478_n3_p675_Mosquera
work_keys_str_mv AT landaususanaj timevariationofthefinestructureconstantintheearlyuniverseandthebekensteinmodel
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