Phantom k-essence cosmologies

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 [Formula Presented] and [Formula Presented] which in turn give [Formula Presented] and [Formula...

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Publicado: 2004
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v70_n2_p5_Aguirregabiria
http://hdl.handle.net/20.500.12110/paper_15507998_v70_n2_p5_Aguirregabiria
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_15507998_v70_n2_p5_Aguirregabiria
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spelling paper:paper_15507998_v70_n2_p5_Aguirregabiria2023-06-08T16:21:54Z Phantom k-essence cosmologies 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 [Formula Presented] and [Formula Presented] which in turn give [Formula Presented] and [Formula Presented] 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. © 2004 The American Physical Society. 2004 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v70_n2_p5_Aguirregabiria http://hdl.handle.net/20.500.12110/paper_15507998_v70_n2_p5_Aguirregabiria
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 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 [Formula Presented] and [Formula Presented] which in turn give [Formula Presented] and [Formula Presented] 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. © 2004 The American Physical Society.
title Phantom k-essence cosmologies
spellingShingle 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
publishDate 2004
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v70_n2_p5_Aguirregabiria
http://hdl.handle.net/20.500.12110/paper_15507998_v70_n2_p5_Aguirregabiria
_version_ 1768542003910410240

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