scholarly journals Study of Thermodynamics in Generalized Holographic and Ricci Dark Energy Models

2011 ◽  
Vol 51 (2) ◽  
pp. 577-588 ◽  
Author(s):  
Samarpita Bhattacharya ◽  
Ujjal Debnath
Keyword(s):  
Dark Energy ◽  
Ricci Dark Energy ◽  
Energy Models

scholarly journals Sandage–Loeb test for the new agegraphic and Ricci dark energy models

2010 ◽  
Vol 691 (1) ◽  
pp. 11-17 ◽  
Author(s):  
Jingfei Zhang ◽  
Li Zhang ◽  
Xin Zhang
Keyword(s):  
Dark Energy ◽  
Ricci Dark Energy ◽  
Energy Models

scholarly journals THERMODYNAMICS IN KALUZA–KLEIN UNIVERSE

2013 ◽  
Vol 28 (17) ◽  
pp. 1350072 ◽  
Author(s):  
M. SHARIF ◽  
RABIA SALEEM
Keyword(s):  
Dark Energy ◽  
Apparent Horizon ◽  
Second Law Of Thermodynamics ◽  
Second Law ◽  
Model Parameters ◽  
Ricci Dark Energy ◽  
Generalized Second Law ◽  
Energy Models ◽  
Fixed Radius ◽  
Kaluza Klein

This paper is devoted to check the validity of laws of thermodynamics for Kaluza–Klein universe in the state of thermal equilibrium, composed of dark matter and dark energy. The generalized holographic dark energy and generalized Ricci dark energy models are considered here. It is proved that the first and generalized second law of thermodynamics are valid on the apparent horizon for both of these models. Further, we take a horizon of radius L with modified holographic or Ricci dark energy. We conclude that these models do not obey the first and generalized second law of thermodynamics on the horizon of fixed radius L for a specific range of model parameters.

scholarly journals STATEFINDER DIAGNOSTIC FOR DARK ENERGY MODELS IN BIANCHI I UNIVERSE

2012 ◽  
Vol 21 (05) ◽  
pp. 1250046 ◽  
Author(s):  
M. SHARIF ◽  
RABIA SALEEM
Keyword(s):  
Dark Energy ◽  
Holographic Dark Energy ◽  
Chaplygin Gas ◽  
Accelerated Expansion ◽  
Ricci Dark Energy ◽  
Generalized Chaplygin Gas ◽  
Bianchi I ◽  
Energy Models ◽  
Expansion Of The Universe ◽  
The Universe

In this paper, we investigate the statefinder, the deceleration and equation of state parameters when universe is composed of generalized holographic dark energy or generalized Ricci dark energy for Bianchi I universe model. These parameters are found for both interacting as well as noninteracting scenarios of generalized holographic or generalized Ricci dark energy with dark matter and generalized Chaplygin gas. We explore these parameters graphically for different situations. It is concluded that these models represent accelerated expansion of the universe.

scholarly journals Interacting Ricci Dark Energy Models with an Effective Λ-term in Lyra Manifold

2014 ◽  
Vol 54 (3) ◽  
pp. 749-760 ◽  
Author(s):  
M. Khurshudyan ◽  
J. Sadeghi ◽  
A. Pasqua ◽  
S. Chattopadhyay ◽  
R. Myrzakulov ◽  
...  
Keyword(s):  
Dark Energy ◽  
Ricci Dark Energy ◽  
Lyra Manifold ◽  
Energy Models

scholarly journals Ricci dark energy in bumblebee gravity model

2019 ◽  
Vol 34 (22) ◽  
pp. 1950171 ◽  
Author(s):  
W. D. R. Jesus ◽  
A. F. Santos
Keyword(s):  
Dark Energy ◽  
Holographic Dark Energy ◽  
Friedmann Equation ◽  
Gravitational Theory ◽  
Coupling Constant ◽  
Ricci Dark Energy ◽  
Dark Energy Density ◽  
Energy Models ◽  
First Case ◽  
Lorentz Symmetry Breaking

The Ricci dark energy is a model inspired by the holographic dark energy models with the dark energy density being proportional to Ricci scalar curvature. Here, this model is studied in the bumblebee gravity theory. It is a gravitational theory that exhibit spontaneous Lorentz symmetry breaking. Then, the modified Friedmann equation is solved for two cases. In the first case, the coupling constant [Formula: see text] is equal to zero and in the second case a solution in the vacuum, where the bumblebee field becomes a constant that minimizes the potential, is considered. The coupling constant controls the interaction gravity-bumblebee.

Sign in / Sign up

Export Citation Format

Share Document