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dc.contributor.author
Chimento, Luis Pascual  
dc.contributor.author
Forte, Mónica  
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Lazkoz, Ruth  
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Richarte, Martín Gustavo  
dc.date.available
2018-10-03T18:47:04Z  
dc.date.issued
2009-02  
dc.identifier.citation
Chimento, Luis Pascual; Forte, Mónica; Lazkoz, Ruth; Richarte, Martín Gustavo; Internal space structure generalization of the quintom cosmological scenario; American Physical Society; Physical Review D: Particles, Fields, Gravitation and Cosmology; 79; 4; 2-2009; 1-10  
dc.identifier.issn
1550-7998  
dc.identifier.uri
http://hdl.handle.net/11336/61565  
dc.description.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.  
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
Quintom  
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Dark Energy  
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Accelerated Universe  
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Astronomía  
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Ciencias Físicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Internal space structure generalization of the quintom cosmological scenario  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2018-10-03T17:45:53Z  
dc.journal.volume
79  
dc.journal.number
4  
dc.journal.pagination
1-10  
dc.journal.pais
Estados Unidos  
dc.journal.ciudad
Nueva York  
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: Forte, Mónica. Universidad de Buenos Aires; Argentina  
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Fil: Lazkoz, Ruth. Universidad del Pais Vasco - Euskal Herriko Unibertsitatea, Campus Bizkaia; España  
dc.description.fil
Fil: Richarte, Martín Gustavo. 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.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.79.043502