K-essence and extended tachyons in brane-worlds

Authors
<div class="autor_fcen" id="1852">Chimento, L.P.</div>; <div class="autor_fcen" id="7253">Richarte, M.G.</div>
Publication Year
2010
Language
English
Format
article
Status
Published version
Description
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.
Source
J. Phys. Conf. Ser. 2010;229
Subject
Big Crunch
Finite time
Kinetic functions
Low-energy limit
Negative energy density
Power law
Quadratic polynomial
Tachyon fields
Control equipment
Relativity
Access level
Open access
License
http://creativecommons.org/licenses/by/2.5/ar
Repository
Biblioteca Digital (UBA-FCEN)
Institution
Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
OAI Identifier
snrd:HASH48160666900b269ebd0a29