Dark matter interacts with variable vacuum energy

We investigate a spatially flat Friedmann-Robertson-Walker scenario with two interacting components, dark matter and variable vacuum energy densities, plus two decoupled components, one is a baryon term while the other behaves as a radiation component. We consider a linear interaction in the derivat...

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Autor principal: Sánchez G., I.E.
Formato: JOUR
Materias:
Age of the universe
Early dark energy
Interaction
Variable vacuum energy
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00017701_v46_n8_p1_SanchezG
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00017701_v46_n8_p1_SanchezG
record_format dspace
spelling todo:paper_00017701_v46_n8_p1_SanchezG2023-10-03T13:52:09Z Dark matter interacts with variable vacuum energy Sánchez G., I.E. Age of the universe Early dark energy Interaction Variable vacuum energy We investigate a spatially flat Friedmann-Robertson-Walker scenario with two interacting components, dark matter and variable vacuum energy densities, plus two decoupled components, one is a baryon term while the other behaves as a radiation component. We consider a linear interaction in the derivative dark component density. We apply the χ2 method to the observational Hubble data for constraining the cosmological parameters and analyze the amount of dark energy in the radiation era for the model. It turns out that our model fulfills the severe bound of Ωx(z ≃ 1,100) < 0.009 at 2σ level, so is consistent with the recent analysis that include cosmic microwave background anisotropy measurements from Planck survey, the future constraints achievable by Euclid and CMBPol experiments, reported for the behavior of the dark energy at early times, and fulfills the stringent bound Ωx(z ≃ 1010)<0.04 at 2σ level in the big-bang nucleosynthesis epoch. We also examine the cosmic age problem at high redshift associated with the old quasar APM 08279+5255 and estimate the age of the universe today. © 2014 Springer Science+Business Media New York. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00017701_v46_n8_p1_SanchezG
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Age of the universe
Early dark energy
Interaction
Variable vacuum energy
spellingShingle Age of the universe
Early dark energy
Interaction
Variable vacuum energy
Sánchez G., I.E.
Dark matter interacts with variable vacuum energy
topic_facet Age of the universe
Early dark energy
Interaction
Variable vacuum energy
description We investigate a spatially flat Friedmann-Robertson-Walker scenario with two interacting components, dark matter and variable vacuum energy densities, plus two decoupled components, one is a baryon term while the other behaves as a radiation component. We consider a linear interaction in the derivative dark component density. We apply the χ2 method to the observational Hubble data for constraining the cosmological parameters and analyze the amount of dark energy in the radiation era for the model. It turns out that our model fulfills the severe bound of Ωx(z ≃ 1,100) < 0.009 at 2σ level, so is consistent with the recent analysis that include cosmic microwave background anisotropy measurements from Planck survey, the future constraints achievable by Euclid and CMBPol experiments, reported for the behavior of the dark energy at early times, and fulfills the stringent bound Ωx(z ≃ 1010)<0.04 at 2σ level in the big-bang nucleosynthesis epoch. We also examine the cosmic age problem at high redshift associated with the old quasar APM 08279+5255 and estimate the age of the universe today. © 2014 Springer Science+Business Media New York.
format JOUR
author Sánchez G., I.E.
author_facet Sánchez G., I.E.
author_sort Sánchez G., I.E.
title Dark matter interacts with variable vacuum energy
title_short Dark matter interacts with variable vacuum energy
title_full Dark matter interacts with variable vacuum energy
title_fullStr Dark matter interacts with variable vacuum energy
title_full_unstemmed Dark matter interacts with variable vacuum energy
title_sort dark matter interacts with variable vacuum energy
url http://hdl.handle.net/20.500.12110/paper_00017701_v46_n8_p1_SanchezG
work_keys_str_mv AT sanchezgie darkmatterinteractswithvariablevacuumenergy
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