Abstract:
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.
Registro:
Documento: |
Artículo
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Título: | Phantom k-essence cosmologies |
Autor: | Aguirregabiria, J.M.; Chimento, L.P.; Lazkoz, R. |
Filiación: | Fisika Teorikoa, Zientzia eta Teknol. Fakultatea, Euskal Herriko Unibertsitatea, 644 Posta Kutxatila, 48080 Bilbao, Spain Departamento de Física, Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
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Palabras clave: | article; cosmos; elementary particle; mathematical analysis; phantom; tachyon |
Año: | 2004
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Volumen: | 70
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Número: | 2
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Página de inicio: | 023509
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Página de fin: | 1-023509-5
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DOI: |
http://dx.doi.org/10.1103/PhysRevD.70.023509 |
Título revista: | Physical Review D - Particles, Fields, Gravitation and Cosmology
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Título revista abreviado: | Phys Rev D Part Fields Gravit Cosmol
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ISSN: | 05562821
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CODEN: | PRVDA
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562821_v70_n2_p023509_Aguirregabiria |
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Citas:
---------- APA ----------
Aguirregabiria, J.M., Chimento, L.P. & Lazkoz, R.
(2004)
. Phantom k-essence cosmologies. Physical Review D - Particles, Fields, Gravitation and Cosmology, 70(2), 023509-1-023509-5.
http://dx.doi.org/10.1103/PhysRevD.70.023509---------- CHICAGO ----------
Aguirregabiria, J.M., Chimento, L.P., Lazkoz, R.
"Phantom k-essence cosmologies"
. Physical Review D - Particles, Fields, Gravitation and Cosmology 70, no. 2
(2004) : 023509-1-023509-5.
http://dx.doi.org/10.1103/PhysRevD.70.023509---------- MLA ----------
Aguirregabiria, J.M., Chimento, L.P., Lazkoz, R.
"Phantom k-essence cosmologies"
. Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 70, no. 2, 2004, pp. 023509-1-023509-5.
http://dx.doi.org/10.1103/PhysRevD.70.023509---------- VANCOUVER ----------
Aguirregabiria, J.M., Chimento, L.P., Lazkoz, R. Phantom k-essence cosmologies. Phys Rev D Part Fields Gravit Cosmol. 2004;70(2):023509-1-023509-5.
http://dx.doi.org/10.1103/PhysRevD.70.023509