Non-flat FRW universe version of Tsallis holographic dark energy in specific modified gravity

Jawad, Abdul; Rani, Shamaila; Azhar, Nadeem

doi:10.1142/s021773231950055x

Cited by 14 publications

(6 citation statements)

References 43 publications

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“…Later, Panotopoulos et al [110] studied three interacting dark energy models utilizing dynamical system tools and statefinder analysis, which have the potential to discriminate between various dark energy models. Moreover, the study of THDE model in a non-flat universe within the framework of dynamical Chern-Simon modified gravity has been done in [111] where the authors have found compatibility of Hubble parameter and cosmological evolution of . The values of curvature density parameter has been extracted from the data provided in [113] deceleration parameter with present day observational data.…”

Section: Discussionmentioning

confidence: 99%

A generalized interacting Tsallis holographic dark energy model and its thermodynamic implications

2020

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The present paper deals with a theoretical model for interacting Tsallis holographic dark energy (THDE) whose infrared cut-off scale is set by the Hubble length. The interaction Q between the dark sectors (dark energy and pressureless dark matter) of the universe has been assumed to be non-gravitational in nature. The functional form of Q is chosen in such a way that it reproduces well known and most used interactions as special cases. We then study the nature of the THDE density parameter, the equation of state parameter, the deceleration parameter and the jerk parameter for this interacting THDE model. Our study shows that the universe exhibits the usual thermal history, namely the successive sequence of radiation, dark matter and dark energy epochs, before resulting in a complete dark energy domination in the far future. It is shown the evolution of the Hubble parameter for our model and compared that with the latest Hubble parameter data. Finally, we also investigate both the stability and thermodynamic nature of this model in the present context.

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Section: Discussionmentioning

confidence: 99%

A generalized interacting Tsallis holographic dark energy model and its thermodynamic implications

2020

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“…In [28], the authors considered nonextensive thermodynamics with a varying exponent. In the framework of modified gravity, the Tsallis model has been discussed in terms of Brans-Dicke gravity [29,30], dynamical Chern-Simons gravity [31], f (T ) and f (G; T ) gravity [32,33] and many others. We considered this model and its generalization to cosmology on the Randall-Sundrum brane in the paper [34], where we investigated the admissible values of the model parameters at which it agrees with the astrophysical observational data.…”

Section: Introductionmentioning

confidence: 99%

Crossing of phantom divide line in model \\of interacting Tsallis holographic dark energy

Astashenok¹,

Tepliakov²

2022

Preprint

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We consider a Tsallis holographic dark energy model with interaction between dark energy and matter. The density of dark energy is taken as ρ d ∼ 3C 2 /L 4−2γ , where C, γ are constants. The event horizon is chosen as the characteristic scale L. The cosmological dynamics of the universe are analyzed, with special attention paid to the possibility of crossing the phantom line w ef f = −1. It is shown that for certain values of parameters this may occur not only once, but also twice.

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“…Investigations on dynamics of THDE with Hubble horizon as IR cutoff, by assuming power law-exponential form for the scale factor have been studied in [55]. Geometrical evolutionary studies in THDE models with Hubble horizon, future event horizon, and GO scale as IR cutoffs corresponding to different interactions have been explored in [56,57,58,59,60,61,62,63]. Investigations on THDE with GO scale as IR cutoff [64], presuming that this energy density is responsible for inflation, show the potentiality of the model in explaining the early universe.…”

Section: Introductionmentioning

confidence: 99%

Tsallis Holographic Dark Energy Reconsidered

Dheepika,

Mathew

2021

Preprint

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We consider the Interacting Tsallis Holographic Dark Energy (THDE) as dynamical vacuum, with the Granda-Oliveros (GO) scale as the infrared (IR) cutoff. To probe the evolution of the spatially flat Friedmann Lemaître Robertson Walker (FLRW) universe with dark energy and matter components, we analytically solved for the Hubble parameter, and the solution traces the evolutionary path from the prior decelerated to the late accelerated epoch. We used Pantheon Supernovae type Ia and Observational Hubble Data to constrain the free parameters of the model. The estimated values of the cosmological parameters were consistent with observational results. We analysed the behaviour of the model using the statefinder and ω e − ω e plane, and the model shows a quintessence behaviour in general and approach ΛCDM in the future. We performed a dynamical analysis of the model, concluding that the prior decelerated and late accelerated phases are unstable and stable equilibria, respectively. We also investigated the thermodynamical nature of the model and found that the horizon entropy is always an increasing function of time; the generalised second law remains valid in the dynamical vacuum treatment of the model.

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Non-flat FRW universe version of Tsallis holographic dark energy in specific modified gravity

Cited by 14 publications

References 43 publications

A generalized interacting Tsallis holographic dark energy model and its thermodynamic implications

A generalized interacting Tsallis holographic dark energy model and its thermodynamic implications

Crossing of phantom divide line in model \\of interacting Tsallis holographic dark energy

Tsallis Holographic Dark Energy Reconsidered

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