scholarly journals Holographic Dark Energy and Present Cosmic Acceleration

2006 ◽  
Author(s):  
Diego Pavón
Keyword(s):  
Dark Energy ◽  
Holographic Dark Energy ◽  
Cosmic Acceleration

Cosmic aspects of chameleon Brans–Dicke gravity with parameterized deceleration parameters

2020 ◽  
Vol 17 (08) ◽  
pp. 2050115
Author(s):  
Abdul Jawad ◽  
Asma Aslam
Keyword(s):  
Dark Energy ◽  
Scalar Field ◽  
Holographic Dark Energy ◽  
Cosmological Parameters ◽  
State Parameter ◽  
Vital Role ◽  
Cosmic Acceleration ◽  
Minimal Coupling ◽  
Frw Universe ◽  
Equation Of State Parameter

We investigate the chameleon Brans–Dicke gravity with new holographic dark energy which includes a non-minimal coupling between matter and scalar field. We use parameterized forms of deceleration parameter for flat FRW universe, which play a vital role to describe the nature of cosmic acceleration. We explore the cosmological parameters like Hubble parameter, equation of state parameter as well as its plane and stability of the obtained solution. The results of cosmological parameter and plane are consistent with observational data.

scholarly journals THE COSMOLOGICAL DYNAMICS OF INTERACTING HOLOGRAPHIC DARK ENERGY MODEL

2009 ◽  
Vol 18 (01) ◽  
pp. 147-157 ◽  
Author(s):  
M. R. SETARE ◽  
ELIAS C. VAGENAS
Keyword(s):  
Dark Energy ◽  
Cosmological Model ◽  
Critical Points ◽  
Dark Energy Model ◽  
Holographic Dark Energy ◽  
Cosmic Acceleration ◽  
Holographic Dark Energy Model ◽  
Evolution Of The Universe ◽  
Energy Scenario ◽  
The Universe

Motivated by the recent observations for cosmic acceleration and the suitable evolution of the universe provided an interaction (decay of dark energy to matter) is incorporated in a cosmological model, we study the cosmological evolution of the interacting holographic dark energy scenario. Critical points are derived and their corresponding cosmological models are presented. The dynamical character of these models is revealed.

scholarly journals Quintessence and Holographic Dark Energy infTGravity

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
M. Zubair
Keyword(s):  
Dark Energy ◽  
Dark Energy Model ◽  
Holographic Dark Energy ◽  
State Parameter ◽  
Energy Model ◽  
Cosmic Acceleration ◽  
Model Parameters ◽  
Efficient Tool ◽  
Future Evolution ◽  
Energy Models

We regardfTtheory as an efficient tool to explain the current cosmic acceleration and associate its evolution with the known dark energy models. The numerical scheme is applied to reconstructfTtheory from dark energy model with constant equation of state parameter and holographic dark energy model. We set the model parametersωϑandcas describing the different evolution eras and show the distinctive behavior of each case realized infTtheory. We also present the future evolution of reconstructedfTand find that it is consistent with the recent observations.

Tsallis holographic dark energy in Bianchi type-III spacetime with scalar fields

2019 ◽  
Vol 34 (37) ◽  
pp. 1950310 ◽  
Author(s):  
Murat Korunur
Keyword(s):  
Dark Energy ◽  
Equation Of State ◽  
Bianchi Type ◽  
Holographic Dark Energy ◽  
Scalar Fields ◽  
Cosmic Acceleration ◽  
Late Time ◽  
Acceleration Phase ◽  
Eos Parameter ◽  
Type Iii

In this paper, we study one of the new dark energy models named Tsallis holographic dark energy (THDE) model considering the Bianchi type-III spacetime model. Considering deceleration parameter, transition from deceleration to acceleration phase happens at [Formula: see text]. The equation of state (EoS) parameter has been found using the Granda–Oliveros (GO) scale. It is found that for [Formula: see text] values, EoS parameter behaves like the quintessence era; for [Formula: see text], EoS parameter behaves like the phantom dark energy and approaches [Formula: see text]CDM model at late-time cosmic acceleration phase. Also, we reconstructed a correspondence between THDE model and some well-known scalar fields, such as tachyon, quintessence and [Formula: see text]-essence. In addition, we evaluated equation of state parameter, kinetic energy and scalar potential versus time.

Cosmological implications of DGP braneworld via well-known holographic dark energy models

2016 ◽  
Vol 25 (14) ◽  
pp. 1650102 ◽  
Author(s):  
Shamaila Rani ◽  
Abdul Jawad
Keyword(s):  
Dark Energy ◽  
Observational Data ◽  
Speed Of Sound ◽  
Deceleration Parameter ◽  
Holographic Dark Energy ◽  
Cosmological Parameters ◽  
Cosmic Acceleration ◽  
Eos Parameter ◽  
Current Scenario ◽  
Dgp Braneworld

The cosmological analysis is being studied in the present work in Dvali–Gabadadze–Porrati (DGP) braneworld scenario by taking various interacting modified holographic dark energy (HDE) models. We discuss the various cosmological parameters such as deceleration parameter, equation-of-state (EoS) parameter and squared speed of sound. It is found that the trajectories of deceleration parameter exhibit in accelerated phase of the universe for all models. The EoS parameter corresponds to various phases of cosmic acceleration like quintessence, vacuum, phantom and also exhibits consistency with observational data. The squared speed of sound also gives stability of models in the current scenario. The [Formula: see text] also gives consistent results with various observational schemes. The statefinders plane also exhibits the cosmic acceleration. It is interesting to remark here that some of our results shows consistency with observational data like WMAP+CMB+BAO+[Formula: see text]+SNe.

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