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Cosmological models from quintessence

AuthorsGonzález-Díaz, Pedro F.
Keywords[PACS] Observational cosmology
[PACS] Particle-theory and field-theory models of the early Universe
Issue Date2000
PublisherAmerican Physical Society
CitationPhysical Review D - Particles, Fields, Gravitation and Cosmology 62: 1- 9 (2000)
AbstractA generalized quintessence model is presented which corresponds to a richer vacuum structure that, in addition to a time-dependent, slowly varying scalar field, contains a varying cosmological term. From first principles we determine a number of scalar-field potentials that satisfy the constraints imposed by the field equations and conservation laws, both in the conventional and generalized quintessence models. In addition to the inverse-power law solutions, these potentials are given in terms of hyperbolic functions or the 12 Jacobian elliptic functions, and are all related to the luminosity distance by means of an integral equation. Integration of this equation for the different solutions leads to a large family of cosmological models characterized by luminosity distance-redshift relations. Out of such models, only four appear to be able to predict a required accelerating universe conforming to observations on supernova type Ia, at large or moderate redshifts. ©2000 The American Physical Society.
Identifiersdoi: 10.1103/PhysRevD.62.023513
issn: 0556-2821
Appears in Collections:(CFMAC-IFF) Artículos
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