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Title

Dark energy and supermassive black holes

AuthorsGonzález-Díaz, Pedro F.
Issue Date2004
PublisherAmerican Physical Society
CitationPhysical Review D - Particles, Fields, Gravitation and Cosmology 70: 063530 (2004)
AbstractThis paper deals with a cosmological model in which the universe is filled with tachyon dark energy in order to describe current and future accelerating expansion. We obtain that the simplest condition for the regime of phantom energy to occur in this scenario is that the scalar field be Wick rotated to imaginary values which correspond to an axionic field classically. By introducing analytical expressions for the scale factor or the Hubble parameter that satisfy all constraint equations of the used models we show that such models describe universes which may develop a big rip singularity in the finite future. It is argued that, contrary to a recent claim, the entropy for a universe filled with dark energy is definite positive even on the phantom regime where the universe would instead acquire a negative temperature. It is also seen that, whichever the fate of the tachyonic accelerating universe, it will be stable to any fluctuations of the scalar field, and that since the considered models have all an imaginary sound speed, any overdense regions will undergo an accelerated collapse leading rapidly to formation of giant black holes. Finally the conjecture is advanced that these black holes may be the supermassive black holes that most galaxies harbor at their center. © 2004 The American Physical Society.
URIhttp://hdl.handle.net/10261/60066
DOI10.1103/PhysRevD.70.063530
Identifiersdoi: 10.1103/PhysRevD.70.063530
issn: 0556-2821
Appears in Collections:(CFMAC-IFF) Artículos
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