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Chimento, L.P.; Forte, M.; Lazkoz, R.; Richarte, M.G. "Internal space structure generalization of the quintom cosmological scenario" (2009) Physical Review D - Particles, Fields, Gravitation and Cosmology. 79(4)
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Abstract:

We introduce the Lagrangian for a multiscalar-field configuration in an N-dimensional internal space endowed with a constant metric Qik, and generalize the quintom cosmological scenario. We find the energy momentum tensor of the model and show that the set of dual transformations, which preserve the form of the Einstein equations in the Friedmann-Robertson-Walker cosmology, is enlarged. We show that the stability of the power-law solutions leads to an exponential potential which is invariant under linear transformations in the internal space. Moreover, we obtain the general exact solution of the Einstein-Klein-Gordon equations for that potential. There exist solutions that cross the phantom divide and solutions that blow up at a finite time, exhibiting a superaccelerated behavior and ending in a big rip. We show that the quintom model with a separable potential can be identified with a mixture of several fluids. This framework includes the ΛCDM model, a bouncing model, and a setting sourced by a cosmic string network plus a cosmological constant. Then we concentrate on the case where the dimension of the internal quintessence sector Nq exceeds the dimension of the internal phantom sector Nph. For (Nq,Nph)=(2,1) the dark energy density derived from the 3-scalar field crosses the phantom divide, and its negative component plays the role of the negative part of a classical Dirac field. © 2009 The American Physical Society.

Registro:

Documento: Artículo
Título:Internal space structure generalization of the quintom cosmological scenario
Autor:Chimento, L.P.; Forte, M.; Lazkoz, R.; Richarte, M.G.
Filiación:Departamento de Física, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Fisika Teorikoa, Zientzia Eta Teknologia Fakultatea, Euskal Herriko Unibertsitatea, 644 Posta Kutxatila, 48080 Bilbao, Spain
Año:2009
Volumen:79
Número:4
DOI: http://dx.doi.org/10.1103/PhysRevD.79.043502
Título revista:Physical Review D - Particles, Fields, Gravitation and Cosmology
Título revista abreviado:Phys Rev D Part Fields Gravit Cosmol
ISSN:15507998
CODEN:PRVDA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v79_n4_p_Chimento

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Citas:

---------- APA ----------
Chimento, L.P., Forte, M., Lazkoz, R. & Richarte, M.G. (2009) . Internal space structure generalization of the quintom cosmological scenario. Physical Review D - Particles, Fields, Gravitation and Cosmology, 79(4).
http://dx.doi.org/10.1103/PhysRevD.79.043502
---------- CHICAGO ----------
Chimento, L.P., Forte, M., Lazkoz, R., Richarte, M.G. "Internal space structure generalization of the quintom cosmological scenario" . Physical Review D - Particles, Fields, Gravitation and Cosmology 79, no. 4 (2009).
http://dx.doi.org/10.1103/PhysRevD.79.043502
---------- MLA ----------
Chimento, L.P., Forte, M., Lazkoz, R., Richarte, M.G. "Internal space structure generalization of the quintom cosmological scenario" . Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 79, no. 4, 2009.
http://dx.doi.org/10.1103/PhysRevD.79.043502
---------- VANCOUVER ----------
Chimento, L.P., Forte, M., Lazkoz, R., Richarte, M.G. Internal space structure generalization of the quintom cosmological scenario. Phys Rev D Part Fields Gravit Cosmol. 2009;79(4).
http://dx.doi.org/10.1103/PhysRevD.79.043502