Holographic dark energy models and higher order generalizations in dynamical Chern–Simons modified gravity

Recently, Tsallis, Rényi and Sharma-Mitall and entropies have widely been used to study the gravitational and cosmological setups. We consider a flat FRW universe with linear interaction between dark energy and dark matter. We discuss the dark energy models using Tsallis, Rényi and Sharma-Mitall entropies in the framework of Chern-Simons modified gravity. We explore various cosmological parameters (equation of state parameter, squared sound of speed ) and cosmological plane (ω d − ω ′ d , where ω ′ d , is the evolutionary equation of state parameter). It is observed that the equation of state parameter gives * quintessence-like nature of the universe in most of the cases. Also, the squared speed of sound shows stability of the models for Tsallis, Rényi dark energy model while unstable behavior for Sharma-Mitall dark energy model. The ω d − ω ′ d plane represents the thawing region for all dark energy models.

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“…We can observe that Rényi and Tsallis entropies can be recovered at the proper limits, using Eq. (25) in Eq. (35), we have…”

Section: Rényi Holographic Dark Energy Modelmentioning

confidence: 99%

“…Cohen et al [24], studied that the construction of HDE density is based on the relation about the vacuum energy of the system whose maximum amount should not exceed the black hole mass. Cosmological consequences of some HDE models in the dynamical Chern-Simons framework, as a modified gravity theory, can be found in Ref [25].…”

Section: Introductionmentioning

confidence: 99%

Cosmological Implications of the Generalized Entropy Based Holographic Dark Energy Models in Dynamical Chern-Simons Modified Gravity

Younas

Jawad

Qummer

et al. 2019

Advances in High Energy Physics

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“…Up to now, most of the works on this gravity have been restricted to cosmological solutions of scale factor in flat FRW universe in the presence of family of well-known HDE models [31][32][33]. Moreover, the cosmological consequences have only been discussed in [34] for Ricci DE model without inclusion of DM. The purpose of this paper is to explore the cosmological implications in a well-known dynamical Chern-Simons modified gravity.…”

Section: Discussionmentioning

confidence: 99%

“…The details of this proposal for a correction to general relativity have been given in [30]. Recently, some people discuss the cosmological scenario/solutions with the inclusion of various HDE models [31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Cosmological Analysis of Dynamical Chern-Simons Modified Gravity via Dark Energy Scenario

Jawad

Rani

2015

Advances in High Energy Physics

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The purpose of this paper is to study the cosmological evolution of the universe in the framework of dynamical Chern-Simons modified gravity. We take pilgrim dark energy model with Hubble and event horizons in interacting scenario with cold dark matter. For this scenario, we discuss cosmological parameters such as Hubble and equation of state and cosmological plane likeωϑ-ωϑ′and squared speed of sound. It is found that Hubble parameter approaches the ranges75-0.5+0.5(foru=2) and (74, 74.30) (foru=1,-1,-2) for Hubble horizon pilgrim dark energy. It implies the ranges74.80-0.005+0.005(foru=2) and (73.4, 74) (foru=-2) for event horizon pilgrim dark energy. The equation of state parameter provides consistent ranges with different observational schemes. Also,ωϑ-ωϑ′planes lie in the range (ωϑ=-1.13-0.25+0.24,ωϑ′<1.32). The squared speed of sound shows stability for all present models in the present scenario. We would like to mention here that our results of various cosmological parameters show consistency with different observational data like Planck, WP, BAO,H0, SNLS, and WMAP.

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“…The evolution equation and EoS parameters for the nonflat FRW universe are elaborated using the HDE model with Granda-Oliveros cut-off in [24]. Pasqua et al [25] investigated HDE and modified the Ricci HDE model in the context of CSMG theory. Ali and Amir [26] discussed the Ricci DE model using the Amended FRW metric in the framework of CSMG theory.…”

Section: Introductionmentioning

confidence: 99%

Amended FRW Metric and Rényi Dark Energy Model

Ali

Iqbal

Khan

et al. 2021

Advances in High Energy Physics

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This article is devoted to exploring the Rényi holographic dark energy model in the theory of Chern-Simons modified gravity. We studied the deceleration parameter, equation of state, and cosmological plane considering the Amended FRW modal. Modified field equations of -gravity theory gave two independent solutions. In the first case, this model provided the transitional change from deceleration to acceleration compatible with collected observational data. However, it supported a decelerating phase of expansion only in the second case. It was noted that the Equation of State advocated the dominance era under the influence of dark energy in the first case and the second predicted the influence of Λ CDM. In both cases, ω < 0 , ω ′ < 0 voted that the universe is in a freezing region and its cosmic expansion is more rapidly accelerated in the background of Chern-Simons modified gravity.

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Holographic dark energy models and higher order generalizations in dynamical Chern–Simons modified gravity

Cited by 30 publications

References 80 publications

Cosmological Implications of the Generalized Entropy Based Holographic Dark Energy Models in Dynamical Chern-Simons Modified Gravity

Cosmological Implications of the Generalized Entropy Based Holographic Dark Energy Models in Dynamical Chern-Simons Modified Gravity

Cosmological Analysis of Dynamical Chern-Simons Modified Gravity via Dark Energy Scenario

Amended FRW Metric and Rényi Dark Energy Model

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