Interacting realization of cosmological singularities with variable vacuum energy

We examine an interacting dark matter variable vacuum energy model for a spatially flat Friedmann-Roberston-Walker spacetime, focusing on the appearance of cosmological singularities such as big rip, big brake, big freeze, and big separation along with abrupt events (infinite γ- singularity and new...

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Autores principales: Chimento, Luis Pascual, Richarte, Martín Gustavo
Publicado: 2015
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v92_n4_p_Chimento
http://hdl.handle.net/20.500.12110/paper_15507998_v92_n4_p_Chimento
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_15507998_v92_n4_p_Chimento
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spelling paper:paper_15507998_v92_n4_p_Chimento2023-06-08T16:22:58Z Interacting realization of cosmological singularities with variable vacuum energy Chimento, Luis Pascual Richarte, Martín Gustavo We examine an interacting dark matter variable vacuum energy model for a spatially flat Friedmann-Roberston-Walker spacetime, focusing on the appearance of cosmological singularities such as big rip, big brake, big freeze, and big separation along with abrupt events (infinite γ- singularity and new w-singularity) at late times. We introduce a phenomenological interaction which has a nonlinear dependence on the total energy density of the dark sector and its derivative, solve exactly the source equation for the model and find the energy density as a function of the scale factor as well as the time dependence of the approximate scale factor in the neighborhood of the singularities. We describe the main characteristics of these singularities by exploring the type of interaction that makes them possible along with behavior of dark components near them. We apply the geometric Tipler and Królak method for determining the fate of timelike geodesic curves around the singularities. We also explore the strength of them by analyzing the leading term in some geometric invariants such as the square Riemann scalar and the Ricci scalar. © 2015 American Physical Society. Fil:Chimento, L.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Richarte, M.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v92_n4_p_Chimento http://hdl.handle.net/20.500.12110/paper_15507998_v92_n4_p_Chimento
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description We examine an interacting dark matter variable vacuum energy model for a spatially flat Friedmann-Roberston-Walker spacetime, focusing on the appearance of cosmological singularities such as big rip, big brake, big freeze, and big separation along with abrupt events (infinite γ- singularity and new w-singularity) at late times. We introduce a phenomenological interaction which has a nonlinear dependence on the total energy density of the dark sector and its derivative, solve exactly the source equation for the model and find the energy density as a function of the scale factor as well as the time dependence of the approximate scale factor in the neighborhood of the singularities. We describe the main characteristics of these singularities by exploring the type of interaction that makes them possible along with behavior of dark components near them. We apply the geometric Tipler and Królak method for determining the fate of timelike geodesic curves around the singularities. We also explore the strength of them by analyzing the leading term in some geometric invariants such as the square Riemann scalar and the Ricci scalar. © 2015 American Physical Society.
author Chimento, Luis Pascual
Richarte, Martín Gustavo
spellingShingle Chimento, Luis Pascual
Richarte, Martín Gustavo
Interacting realization of cosmological singularities with variable vacuum energy
author_facet Chimento, Luis Pascual
Richarte, Martín Gustavo
author_sort Chimento, Luis Pascual
title Interacting realization of cosmological singularities with variable vacuum energy
title_short Interacting realization of cosmological singularities with variable vacuum energy
title_full Interacting realization of cosmological singularities with variable vacuum energy
title_fullStr Interacting realization of cosmological singularities with variable vacuum energy
title_full_unstemmed Interacting realization of cosmological singularities with variable vacuum energy
title_sort interacting realization of cosmological singularities with variable vacuum energy
publishDate 2015
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v92_n4_p_Chimento
http://hdl.handle.net/20.500.12110/paper_15507998_v92_n4_p_Chimento
work_keys_str_mv AT chimentoluispascual interactingrealizationofcosmologicalsingularitieswithvariablevacuumenergy
AT richartemartingustavo interactingrealizationofcosmologicalsingularitieswithvariablevacuumenergy
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