Finite time future singularities in the interacting dark sector

We construct a piecewise model that gives a physical viable realization of finite-time future singularity for a spatially flat Friedmann-Robertson-Walker universe within the interacting dark matter-dark energy framework, with the latter in the form of a variable vacuum energy. The scale factor solut...

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Autores principales: Chimento, Luis Pascual, Richarte, Martín Gustavo
Publicado: 2017
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_24700010_v95_n6_p_Cataldo
http://hdl.handle.net/20.500.12110/paper_24700010_v95_n6_p_Cataldo
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_24700010_v95_n6_p_Cataldo2023-06-08T16:36:30Z Finite time future singularities in the interacting dark sector Chimento, Luis Pascual Richarte, Martín Gustavo We construct a piecewise model that gives a physical viable realization of finite-time future singularity for a spatially flat Friedmann-Robertson-Walker universe within the interacting dark matter-dark energy framework, with the latter in the form of a variable vacuum energy. The scale factor solutions provided by the model are accommodated in several branches defined in four regions delimited by the scale factor and the effective energy density. A branch starts from a big bang singularity and describes an expanding matter-dominated universe until the sudden future singularity occurs. Then, an expanding branch emerges from a past singularity, reaches a maximum, reverses its expansion, and possibly collapses into itself while another expanding branch emerges from the latter singularity and has a de Sitter phase which is intrinsically stable. We obtain a different piecewise scale factor which describes a contracting de Sitter universe in the distant past until the finite-time future singularity happens. It emerges and continues in a contracting phase, bounces at the minimum, reverses, and enters into a stable de Sitter phase without a dramatic final. Also, we explore the aforesaid cosmic scenarios by focusing on the leading contributions of some physical quantities near the sudden future singularity and applying the geometric Tipler and Królak criteria in order to inspect the behavior of timelike geodesic curves around such singularity. © 2017 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. 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_24700010_v95_n6_p_Cataldo http://hdl.handle.net/20.500.12110/paper_24700010_v95_n6_p_Cataldo
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 construct a piecewise model that gives a physical viable realization of finite-time future singularity for a spatially flat Friedmann-Robertson-Walker universe within the interacting dark matter-dark energy framework, with the latter in the form of a variable vacuum energy. The scale factor solutions provided by the model are accommodated in several branches defined in four regions delimited by the scale factor and the effective energy density. A branch starts from a big bang singularity and describes an expanding matter-dominated universe until the sudden future singularity occurs. Then, an expanding branch emerges from a past singularity, reaches a maximum, reverses its expansion, and possibly collapses into itself while another expanding branch emerges from the latter singularity and has a de Sitter phase which is intrinsically stable. We obtain a different piecewise scale factor which describes a contracting de Sitter universe in the distant past until the finite-time future singularity happens. It emerges and continues in a contracting phase, bounces at the minimum, reverses, and enters into a stable de Sitter phase without a dramatic final. Also, we explore the aforesaid cosmic scenarios by focusing on the leading contributions of some physical quantities near the sudden future singularity and applying the geometric Tipler and Królak criteria in order to inspect the behavior of timelike geodesic curves around such singularity. © 2017 American Physical Society.
author Chimento, Luis Pascual
Richarte, Martín Gustavo
spellingShingle Chimento, Luis Pascual
Richarte, Martín Gustavo
Finite time future singularities in the interacting dark sector
author_facet Chimento, Luis Pascual
Richarte, Martín Gustavo
author_sort Chimento, Luis Pascual
title Finite time future singularities in the interacting dark sector
title_short Finite time future singularities in the interacting dark sector
title_full Finite time future singularities in the interacting dark sector
title_fullStr Finite time future singularities in the interacting dark sector
title_full_unstemmed Finite time future singularities in the interacting dark sector
title_sort finite time future singularities in the interacting dark sector
publishDate 2017
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_24700010_v95_n6_p_Cataldo
http://hdl.handle.net/20.500.12110/paper_24700010_v95_n6_p_Cataldo
work_keys_str_mv AT chimentoluispascual finitetimefuturesingularitiesintheinteractingdarksector
AT richartemartingustavo finitetimefuturesingularitiesintheinteractingdarksector
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