Duality gives rise to Chaplygin cosmologies with a big rip

We consider modifications to the Friedmann equation motivated by recent proposals along these lines pursuing an explanation to the observed late time acceleration. Here we show that these approaches can be framed within a theory with modified gravity, and we discuss the construction of the duals of...

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Autores principales: Chimento, L.P., Lazkoz, R.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_02649381_v23_n9_p3195_Chimento
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_02649381_v23_n9_p3195_Chimento2023-10-03T15:13:15Z Duality gives rise to Chaplygin cosmologies with a big rip Chimento, L.P. Lazkoz, R. We consider modifications to the Friedmann equation motivated by recent proposals along these lines pursuing an explanation to the observed late time acceleration. Here we show that these approaches can be framed within a theory with modified gravity, and we discuss the construction of the duals of the cosmologies generated within that framework. We then investigate the modifications required to generate extended, generalized and modified Chaplygin cosmologies, and then show that their duals belong to a larger family of cosmologies we call enlarged Chaplygin cosmologies. Finally, by letting the parameters of these models take values not earlier considered in the literature we show that some representatives of that family of cosmologies display sudden future singularities. This fact indicates that the behaviour of these spacetimes is rather different from that of generalized or modified Chaplygin gas cosmologies. This reinforces the idea that modifications of gravity can be responsible for unexpected evolutionary features in the universe. © 2006 IOP Publishing Ltd. Fil:Chimento, L.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02649381_v23_n9_p3195_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 consider modifications to the Friedmann equation motivated by recent proposals along these lines pursuing an explanation to the observed late time acceleration. Here we show that these approaches can be framed within a theory with modified gravity, and we discuss the construction of the duals of the cosmologies generated within that framework. We then investigate the modifications required to generate extended, generalized and modified Chaplygin cosmologies, and then show that their duals belong to a larger family of cosmologies we call enlarged Chaplygin cosmologies. Finally, by letting the parameters of these models take values not earlier considered in the literature we show that some representatives of that family of cosmologies display sudden future singularities. This fact indicates that the behaviour of these spacetimes is rather different from that of generalized or modified Chaplygin gas cosmologies. This reinforces the idea that modifications of gravity can be responsible for unexpected evolutionary features in the universe. © 2006 IOP Publishing Ltd.
format JOUR
author Chimento, L.P.
Lazkoz, R.
spellingShingle Chimento, L.P.
Lazkoz, R.
Duality gives rise to Chaplygin cosmologies with a big rip
author_facet Chimento, L.P.
Lazkoz, R.
author_sort Chimento, L.P.
title Duality gives rise to Chaplygin cosmologies with a big rip
title_short Duality gives rise to Chaplygin cosmologies with a big rip
title_full Duality gives rise to Chaplygin cosmologies with a big rip
title_fullStr Duality gives rise to Chaplygin cosmologies with a big rip
title_full_unstemmed Duality gives rise to Chaplygin cosmologies with a big rip
title_sort duality gives rise to chaplygin cosmologies with a big rip
url http://hdl.handle.net/20.500.12110/paper_02649381_v23_n9_p3195_Chimento
work_keys_str_mv AT chimentolp dualitygivesrisetochaplygincosmologieswithabigrip
AT lazkozr dualitygivesrisetochaplygincosmologieswithabigrip
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