Phantom k-essence cosmologies

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We devise a method to obtain a phantom version of FRW k-essence cosmologies with homogeneous k fields by applying form-invariance transformations. It can be seen that the transformation performs the maps H→-H and ρ+p→-(ρ+p), which in turn give γ→-γ and a→a-1. The discussion is presented in a general...

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Autores principales: Aguirregabiria, J.M., Chimento, L.P., Lazkoz, R.
Formato: JOUR
Materias:
article
cosmos
elementary particle
mathematical analysis
phantom
tachyon
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_05562821_v70_n2_p023509_Aguirregabiria
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_05562821_v70_n2_p023509_Aguirregabiria
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spelling todo:paper_05562821_v70_n2_p023509_Aguirregabiria2023-10-03T15:35:50Z Phantom k-essence cosmologies Aguirregabiria, J.M. Chimento, L.P. Lazkoz, R. article cosmos elementary particle mathematical analysis phantom tachyon We devise a method to obtain a phantom version of FRW k-essence cosmologies with homogeneous k fields by applying form-invariance transformations. It can be seen that the transformation performs the maps H→-H and ρ+p→-(ρ+p), which in turn give γ→-γ and a→a-1. The discussion is presented in a general setup, valid for FRW k-essence cosmologies, and then we discuss power-law solutions for illustration purposes. First, we deal with models such that the gradient of the k field is not constant, and they include standard and generalized tachyon cosmologies. We concentrate on the usual tachyon and show that the phantom symmetry involves a change in the potential: and that it generates an extended superaccelerated tachyon field. Then, we turn our attention to models for which the time derivative of the k field is not constant, and we show the transformation can be implemented without changing the potential at all. 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_05562821_v70_n2_p023509_Aguirregabiria
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic article
cosmos
elementary particle
mathematical analysis
phantom
tachyon
spellingShingle article
cosmos
elementary particle
mathematical analysis
phantom
tachyon
Aguirregabiria, J.M.
Chimento, L.P.
Lazkoz, R.
Phantom k-essence cosmologies
topic_facet article
cosmos
elementary particle
mathematical analysis
phantom
tachyon
description We devise a method to obtain a phantom version of FRW k-essence cosmologies with homogeneous k fields by applying form-invariance transformations. It can be seen that the transformation performs the maps H→-H and ρ+p→-(ρ+p), which in turn give γ→-γ and a→a-1. The discussion is presented in a general setup, valid for FRW k-essence cosmologies, and then we discuss power-law solutions for illustration purposes. First, we deal with models such that the gradient of the k field is not constant, and they include standard and generalized tachyon cosmologies. We concentrate on the usual tachyon and show that the phantom symmetry involves a change in the potential: and that it generates an extended superaccelerated tachyon field. Then, we turn our attention to models for which the time derivative of the k field is not constant, and we show the transformation can be implemented without changing the potential at all.
format JOUR
author Aguirregabiria, J.M.
Chimento, L.P.
Lazkoz, R.
author_facet Aguirregabiria, J.M.
Chimento, L.P.
Lazkoz, R.
author_sort Aguirregabiria, J.M.
title Phantom k-essence cosmologies
title_short Phantom k-essence cosmologies
title_full Phantom k-essence cosmologies
title_fullStr Phantom k-essence cosmologies
title_full_unstemmed Phantom k-essence cosmologies
title_sort phantom k-essence cosmologies
url http://hdl.handle.net/20.500.12110/paper_05562821_v70_n2_p023509_Aguirregabiria
work_keys_str_mv AT aguirregabiriajm phantomkessencecosmologies
AT chimentolp phantomkessencecosmologies
AT lazkozr phantomkessencecosmologies
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