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dc.contributor.author
Aguirregabiria, Juan M.
dc.contributor.author
Chimento, Luis Pascual
dc.contributor.author
Lazkoz, Ruth
dc.date.available
2019-04-26T17:02:13Z
dc.date.issued
2004-12
dc.identifier.citation
Aguirregabiria, Juan M.; Chimento, Luis Pascual; Lazkoz, Ruth; Phantom k-essence cosmologies; American Physical Society; Physical Review D: Particles, Fields, Gravitation and Cosmology; 70; 2; 12-2004; 1-5
dc.identifier.issn
1550-7998
dc.identifier.uri
http://hdl.handle.net/11336/75097
dc.description.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 [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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Physical Society
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
K Essence
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Phatontom Cosmology
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Extended Tachyon Fields
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Astronomía
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Phantom k-essence cosmologies
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-04-23T15:08:17Z
dc.journal.volume
70
dc.journal.number
2
dc.journal.pagination
1-5
dc.journal.pais
Estados Unidos
dc.journal.ciudad
Nueva York
dc.description.fil
Fil: Aguirregabiria, Juan M.. Universidad del Pais Vasco - Euskal Herriko Unibertsitatea, Campus Bizkaia; España
dc.description.fil
Fil: Chimento, Luis Pascual. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; Argentina
dc.description.fil
Fil: Lazkoz, Ruth. Universidad del Pais Vasco - Euskal Herriko Unibertsitatea, Campus Bizkaia; España
dc.journal.title
Physical Review D: Particles, Fields, Gravitation and Cosmology
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1103/PhysRevD.70.023509
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