Crossing the phantom divide without phantom matter
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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Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_14757516_v_n9_p_Chimento |
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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 |
_version_ |
1782029350869139456 |