scholarly journals Holographic dark energy from nonadditive entropy: Cosmological perturbations and observational constraints

2019 ◽  
Vol 99 (10) ◽  
Author(s):  
Rocco D’Agostino
Keyword(s):  
Dark Energy ◽  
Holographic Dark Energy ◽  
Observational Constraints ◽  
Cosmological Perturbations ◽  
Nonadditive Entropy

scholarly journals GENERALIZED HOLOGRAPHIC DARK ENERGY AND ITS OBSERVATIONAL CONSTRAINTS

2012 ◽  
Vol 27 (20) ◽  
pp. 1250115 ◽  
Author(s):  
ZHENHUI ZHANG ◽  
MIAO LI ◽  
XIAO-DONG LI ◽  
SHUANG WANG ◽  
WEN-SHUAI ZHANG
Keyword(s):  
Dark Energy ◽  
Holographic Dark Energy ◽  
Joint Analysis ◽  
Observational Constraints ◽  
Dark Energy Density ◽  
Cosmological Constraints ◽  
Dimensionless Constant ◽  
The Future ◽  
Type C ◽  
Physical Quantities

In the original holographic dark energy (HDE) model, the dark energy density is proposed to be [Formula: see text], with c 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 +H0data. 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 [Formula: see text] 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).

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