scholarly journals Reconstructing f(R) modified gravity from ordinary and entropy-corrected versions of the holographic and new agegraphic dark energy models

2011 ◽  
Vol 2011 (3) ◽  
Author(s):  
K. Karami ◽  
M. S. Khaledian
Keyword(s):  
Dark Energy ◽  
Modified Gravity ◽  
Agegraphic Dark Energy ◽  
New Agegraphic Dark Energy ◽  
Energy Models

Entropy-corrected new agegraphic dark energy model in the context of Chern–Simons modified gravity

2015 ◽  
Vol 24 (06) ◽  
pp. 1550044
Author(s):  
Ayman A. Aly ◽  
M. Fekry ◽  
H. Mansour
Keyword(s):  
Dark Energy ◽  
Modified Gravity ◽  
Generalized Uncertainty Principle ◽  
Chaplygin Gas ◽  
Modified Chaplygin Gas ◽  
Agegraphic Dark Energy ◽  
New Agegraphic Dark Energy ◽  
Energy Models ◽  
Cs Modified Gravity ◽  
Chern Simons

Within the framework of Chern–Simons (CS) modified gravity, we studied dark energy models. The new agegraphic dark energy (NADE) model, entropy-corrected new agegraphic dark energy (ECNADE) model and NADE model with generalized uncertainty principle (GUP) are investigated. For these models, we studied the evolution of scale factor a, Hubble parameter H and deceleration parameter q. On meantime, we studied the state finder parameters s and r. These models show some similar behavior with modified Chaplygin gas model in some regions, while in other regions some similarity with phantom and quintessence dark energy is noticed.

Analysis of entropy corrected holographic and new agegraphic dark energy models in generalized Rastall gravity

2020 ◽  
Vol 35 (28) ◽  
pp. 2050175
Author(s):  
Sayani Maity ◽  
Mahasweta Biswas ◽  
Ujjal Debnath
Keyword(s):  
Dark Energy ◽  
Cosmological Parameters ◽  
State Parameter ◽  
Graphical Analysis ◽  
Future Singularity ◽  
Agegraphic Dark Energy ◽  
New Agegraphic Dark Energy ◽  
Energy Models ◽  
Dark Energy Component ◽  
The Stability

This work deals with two fluid system in the framework of generalized Rastall gravity theory. One component represents dark energy whereas the other is dark matter. For the dark energy component, entropy corrected holographic and entropy corrected new agegraphic dark energy models in power-law and logarithmic versions are taken into account. For this study, we assume two classes of scale factors in which one corresponds to the future singularity and another corresponds to the initial singularity. For each of the entropy corrected dark energy models, the cosmological parameters such as Hubble parameter, deceleration parameter and equation of state parameter are calculated and their implications are established. Furthermore, to describe the stability analysis of the models, the behaviors of the squared speed of sound are analyzed graphically for each of these models. From the graphical analysis of [Formula: see text] plane, the thawing or freezing regions of all the models are determined.

scholarly journals NEW AGEGRAPHIC DARK ENERGY MODEL WITH GENERALIZED UNCERTAINTY PRINCIPLE

2008 ◽  
Vol 23 (36) ◽  
pp. 3049-3055 ◽  
Author(s):  
YONG-WAN KIM ◽  
HYUNG WON LEE ◽  
YUN SOO MYUNG ◽  
MU-IN PARK
Keyword(s):  
Dark Energy ◽  
Early Universe ◽  
Uncertainty Principle ◽  
Dark Energy Model ◽  
Generalized Uncertainty Principle ◽  
Critical Value ◽  
Agegraphic Dark Energy ◽  
New Agegraphic Dark Energy ◽  
The Past ◽  
Energy Models

We investigate the new agegraphic dark energy models with generalized uncertainty principle (GUP). It turns out that although the GUP affects the early universe, it does not change the current and future dark energy-dominated universe significantly. Furthermore, this model could describe the matter-dominated universe in the past only when the parameter n is chosen to be n > n c , where the critical value is determined to be n c = 2.799531478.

Cosmological consequences of Rényi, Sharma–Mittal holographic and new agegraphic dark energy models in generalized Rastall gravity

2021 ◽  
pp. 2150180
Author(s):  
Alok Sardar ◽  
Ujjal Debnath
Keyword(s):  
Dark Energy ◽  
Holographic Dark Energy ◽  
Future Event ◽  
Fluid System ◽  
Future Singularity ◽  
Eos Parameter ◽  
Agegraphic Dark Energy ◽  
New Agegraphic Dark Energy ◽  
Energy Models ◽  
Two Fluid

The main motivation of our study is to explore Rényi holographic dark energy, Sharma–Mittal holographic dark energy, Rényi new agegraphic dark energy, and Sharma–Mittal new agegraphic dark energy in the context of generalized Rastall gravity with the two-fluid system, dark energy, and dark matter. In this regard, we have considered the scale factors into two distinct categories, one of which corresponds to the future singularity, whereas the other represents initial singularity. By employing future event horizon as infrared (IR)-cutoff, different cosmological quantities like deceleration parameter, equation of state (EoS) parameter are evaluated, and their ramifications have been described graphically. Analyzing the squared speed of sound, we have seen classically stable and unstable behavior for each of the considered models. Finally, we study [Formula: see text]–[Formula: see text] plane and find the thawing/freezing regions.

scholarly journals Evolution of spherical overdensities in new agegraphic dark energy model

2017 ◽  
Vol 26 (09) ◽  
pp. 1750101
Author(s):  
M. R. Setare ◽  
F. Felegary ◽  
F. Darabi
Keyword(s):  
Dark Energy ◽  
Dark Energy Model ◽  
Holographic Dark Energy ◽  
Frw Cosmology ◽  
Spherical Region ◽  
Agegraphic Dark Energy ◽  
New Agegraphic Dark Energy ◽  
Energy Models ◽  
Spherical Collapse ◽  
Collapse Model

We study the structure formation by investigating the spherical collapse model in the context of new agegraphic dark energy (NADE) model in flat FRW cosmology. We compute the perturbational quantities [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] for the NADE model and compare the results with those of EdS and [Formula: see text] models. We find that there is a dark energy-dominated universe at low redshifts and a matter-dominated universe at high redshifts in agreement with the observations. Also, the size of structures, the overdense spherical region, and the halo size in the NADE model are found to be smaller, denser, and larger than those of EdS and [Formula: see text] models. We compare our results with the results of tachyon scalar field and holographic dark energy models.

scholarly journals INTERACTING MODEL OF NEW AGEGRAPHIC DARK ENERGY: COSMOLOGICAL EVOLUTION AND STATEFINDER DIAGNOSTIC

2010 ◽  
Vol 19 (01) ◽  
pp. 21-35 ◽  
Author(s):  
LI ZHANG ◽  
JINGLEI CUI ◽  
JINGFEI ZHANG ◽  
XIN ZHANG
Keyword(s):  
Dark Energy ◽  
Dark Energy Model ◽  
Energy Model ◽  
Cosmological Evolution ◽  
Agegraphic Dark Energy ◽  
New Agegraphic Dark Energy ◽  
Evolution Of The Universe ◽  
Energy Models ◽  
The Universe ◽  
Matter Component

The statefinder diagnostic is a useful method for distinguishing different dark energy models. In this paper, we investigate the new agegraphic dark energy model with interaction between dark energy and matter component by using statefinder parameter pair {r, s} and study its cosmological evolution. We plot the trajectories of the new agegraphic dark energy model for different interaction cases in the statefinder plane. As a result, the influence of the interaction on the evolution of the universe is shown in the statefinder diagrams.

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