Generalized Holographic Dark Energy and its Observational Constraints

Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

22 pages, 7 figures, 2 tables, references added

Scientific paper

In the original holographic dark energy (HDE) model, the dark energy density is proposed to be $\rho_{de} = 3c^2M^2_{pl}L^{-2}$, with $c$ is a dimensionless constant characterizing the properties of the HDE. In this work, we propose the generalized holographic dark energy (GHDE) model by considering the parameter $c$ as a redshift-dependent function $c(z)$. We derive all the physical quantities of the GHDE model analytically, and fit the $c(z)$ by trying four kinds of parametrizations. The cosmological constraints of the $c(z)$ are obtained from the joint analysis of the present SNLS3+BAO+CMB+$H_0$ data. We find that, compared with the original HDE model, the GHDE models can provide a better fit to the data. For example, the GHDE model with JBP-type $c(z)$ can reduce the $\chi^2_{min}$ of the HDE model by 2.16. We also find that, unlike the original HDE model with a phantom-like behavior in the future, the GHDE models can present many more different possibilities, i.e., it allows the GHDE in the future to be either quintessence like, cosmological constant like, or phantom like, depending on the forms of $c(z)$.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Generalized Holographic Dark Energy and its Observational Constraints does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Generalized Holographic Dark Energy and its Observational Constraints, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Generalized Holographic Dark Energy and its Observational Constraints will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-659611

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.