Holographic dark energy with time varying parameter c2

We consider the holographic dark energy model in which the model parameter c 2 evolves slowly with time. First we calculate the evolution of EoS parameter as well as the deceleration parameter in this generalized version of holographic dark energy (GHDE). Depending on the parameter c 2 , the phantom...

Full description

Saved in:
Bibliographic Details
Published in:Astrophysics and space science 2013, Vol.343 (2), p.799-806
Main Authors: Malekjani, M., Zarei, R., Honari-Jafarpour, M.
Format: Article
Language:English
Subjects:
Astrobiology
Astronomy
Astrophysics and Astroparticles
Cosmology
Observations and Techniques
Original Article
Physics
Physics and Astronomy
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We consider the holographic dark energy model in which the model parameter c 2 evolves slowly with time. First we calculate the evolution of EoS parameter as well as the deceleration parameter in this generalized version of holographic dark energy (GHDE). Depending on the parameter c 2 , the phantom regime can be achieved earlier or later compare with original version of holographic dark energy. The evolution of energy density of GHDE model is investigated in terms of parameter c 2 . We also show that the time-dependency of c 2 can effect on the transition epoch from decelerated phase to accelerated expansion. Finally, we perform the statefinder diagnostic for GHDE model and show that the evolutionary trajectories of the model in s – r plane are strongly depend on the parameter  c 2 .
ISSN:0004-640X
1572-946X
DOI:10.1007/s10509-012-1283-3