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...

Descripción completa

Guardado en:
Detalles Bibliográficos
Publicado: 2006
Materias:
Cosmological applications of theories with extra dimensions
Dark energy theory
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14757516_v_n9_p_Chimento
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 paper:paper_14757516_v_n9_p_Chimento
record_format dspace
spelling paper:paper_14757516_v_n9_p_Chimento2025-07-30T18:53:42Z Crossing the phantom divide without phantom matter 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. 2006 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14757516_v_n9_p_Chimento 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
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.
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
publishDate 2006
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14757516_v_n9_p_Chimento
http://hdl.handle.net/20.500.12110/paper_14757516_v_n9_p_Chimento
_version_ 1840324424570503168

Ejemplares similares