K-essence and extended tachyons in brane-worlds

En:

J. Phys. Conf. Ser. 2010;229

Fecha:

2010

Formato:

application/pdf

Tipo de documento:

info:eu-repo/semantics/conferenceObject
info:ar-repo/semantics/documento de conferencia
info:eu-repo/semantics/publishedVersion

Descriptores:

Cosmology -  Big Crunch -  Finite time -  Homogeneous and isotropic -  Kinetic functions -  Low-energy limit -  Negative energy density -  Quadratic polynomial -  Tachyon fields

Descripción:

We study a k-essence field evolving linearly with the cosmic time and the atypical k-essence model on a homogeneous and isotropic flat 3-brane. We show that the k-field is driven by an inverse quadratic polynomial potential. The solutions represent expanding, contracting or bouncing universes with a finite time span and some of them end in a big crunch or a big rip. Besides, by selecting the extended tachyonic kinetic functions we analyze the high and low energy limits of our model, obtaining the nearly power law solution. We introduce a tachyon field with negative energy density and show that the universe evolves between two singularities. © 2010 IOP Publishing Ltd.
Fil:Chimento, L.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:Richarte, M.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.

Identificador(es):

http://hdl.handle.net/20.500.12110/paper_17426588_v229_n_p_Chimento

Derechos:

info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/2.5/ar