Time variation of the fine structure constant and of the Higgs vacuum expectation value on cosmological time scales

Aims. We study the time variation of both the fine structure constant, α, and the Higgs vacuum expectation value, v, during Big Bang nucleosynthesis (BBN). Methods. We calculate the primordial abundances of D, 4He, and 7Li by modifying Kawano's code, and by using observational data we set const...

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Detalles Bibliográficos
Autores principales: Mosquera, Mercedes Elisa, Civitarese, Enrique Osvaldo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2011
Materias:
Ciencias Astronómicas
Física
Abundances
Cosmology: theory
Nuclear reactions
Nucleosynthesis
Primordial nucleosynthesis
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85614
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85614
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
Física
Abundances
Cosmology: theory
Nuclear reactions
Nucleosynthesis
Primordial nucleosynthesis
spellingShingle Ciencias Astronómicas
Física
Abundances
Cosmology: theory
Nuclear reactions
Nucleosynthesis
Primordial nucleosynthesis
Mosquera, Mercedes Elisa
Civitarese, Enrique Osvaldo
Time variation of the fine structure constant and of the Higgs vacuum expectation value on cosmological time scales
topic_facet Ciencias Astronómicas
Física
Abundances
Cosmology: theory
Nuclear reactions
Nucleosynthesis
Primordial nucleosynthesis
description Aims. We study the time variation of both the fine structure constant, α, and the Higgs vacuum expectation value, v, during Big Bang nucleosynthesis (BBN). Methods. We calculate the primordial abundances of D, 4He, and 7Li by modifying Kawano's code, and by using observational data we set constraints on the joint variation of α and v. To perform the calculations we considered the dependence of the deuterium-binding energy, D, upon v, obtained from the treatment of different proton-neutron interactions. Results. Results are consistent with variation on v (even at the level of 6σ) and null variation of α (within 2σ) if the 7Li data are used in the analysis. However, if data on these nuclei are not considered in the statistical analysis, we found null variation on both fundamental constants within 2σ. Conclusions. We found that the best-fit values of the variation of v and α are sensible to the dependence of the deuterium binding energy upon the Higgs vacuum expectation value. We found non-null variation of v within 6σ if all the observational data are used in the analysis. If data on the primordial abundance of 7Li are taken at face value, the discrepancy between BBN and WMAP estimates may be explained by allowing variations of v.
format Articulo
Articulo
author Mosquera, Mercedes Elisa
Civitarese, Enrique Osvaldo
author_facet Mosquera, Mercedes Elisa
Civitarese, Enrique Osvaldo
author_sort Mosquera, Mercedes Elisa
title Time variation of the fine structure constant and of the Higgs vacuum expectation value on cosmological time scales
title_short Time variation of the fine structure constant and of the Higgs vacuum expectation value on cosmological time scales
title_full Time variation of the fine structure constant and of the Higgs vacuum expectation value on cosmological time scales
title_fullStr Time variation of the fine structure constant and of the Higgs vacuum expectation value on cosmological time scales
title_full_unstemmed Time variation of the fine structure constant and of the Higgs vacuum expectation value on cosmological time scales
title_sort time variation of the fine structure constant and of the higgs vacuum expectation value on cosmological time scales
publishDate 2011
url http://sedici.unlp.edu.ar/handle/10915/85614
work_keys_str_mv AT mosqueramercedeselisa timevariationofthefinestructureconstantandofthehiggsvacuumexpectationvalueoncosmologicaltimescales
AT civitareseenriqueosvaldo timevariationofthefinestructureconstantandofthehiggsvacuumexpectationvalueoncosmologicaltimescales
bdutipo_str Repositorios
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