Crossing the phantom divide without phantom matter

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A class of braneworld models can lead to phantom-like acceleration of the late universe, but without the need for any phantom matter. In the simplest models, the universe contains only cold dark matter and a cosmological constant. We generalize these models by introducing a quintessence field. The n...

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Autores principales: Chimento, L.P., Lazkoz, R., Maartens, R., Quiros, I.
Formato: JOUR
Materias:
Cosmological applications of theories with extra dimensions
Dark energy theory
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_14757516_v_n9_p_Chimento
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_14757516_v_n9_p_Chimento
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spelling todo:paper_14757516_v_n9_p_Chimento2023-10-03T16:18:57Z Crossing the phantom divide without phantom matter Chimento, L.P. Lazkoz, R. Maartens, R. Quiros, I. Cosmological applications of theories with extra dimensions Dark energy theory A class of braneworld models can lead to phantom-like acceleration of the late universe, but without the need for any phantom matter. In the simplest models, the universe contains only cold dark matter and a cosmological constant. We generalize these models by introducing a quintessence field. The new feature in our models is that quintessence leads to a crossing of the phantom divide, w = -1. This is a purely gravitational effect, and there is no phantom instability. Furthermore, the Hubble parameter is always decreasing, and there is no big rip singularity in the future. © IOP Publishing Ltd. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_14757516_v_n9_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)
topic Cosmological applications of theories with extra dimensions
Dark energy theory
spellingShingle Cosmological applications of theories with extra dimensions
Dark energy theory
Chimento, L.P.
Lazkoz, R.
Maartens, R.
Quiros, I.
Crossing the phantom divide without phantom matter
topic_facet Cosmological applications of theories with extra dimensions
Dark energy theory
description A class of braneworld models can lead to phantom-like acceleration of the late universe, but without the need for any phantom matter. In the simplest models, the universe contains only cold dark matter and a cosmological constant. We generalize these models by introducing a quintessence field. The new feature in our models is that quintessence leads to a crossing of the phantom divide, w = -1. This is a purely gravitational effect, and there is no phantom instability. Furthermore, the Hubble parameter is always decreasing, and there is no big rip singularity in the future. © IOP Publishing Ltd.
format JOUR
author Chimento, L.P.
Lazkoz, R.
Maartens, R.
Quiros, I.
author_facet Chimento, L.P.
Lazkoz, R.
Maartens, R.
Quiros, I.
author_sort Chimento, L.P.
title Crossing the phantom divide without phantom matter
title_short Crossing the phantom divide without phantom matter
title_full Crossing the phantom divide without phantom matter
title_fullStr Crossing the phantom divide without phantom matter
title_full_unstemmed Crossing the phantom divide without phantom matter
title_sort crossing the phantom divide without phantom matter
url http://hdl.handle.net/20.500.12110/paper_14757516_v_n9_p_Chimento
work_keys_str_mv AT chimentolp crossingthephantomdividewithoutphantommatter
AT lazkozr crossingthephantomdividewithoutphantommatter
AT maartensr crossingthephantomdividewithoutphantommatter
AT quirosi crossingthephantomdividewithoutphantommatter
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