Dynamics of an interacting Barrow holographic dark energy model and its thermodynamic implications

Mamon, Abdulla Al; Paliathanasis, Andronikos; Saha, Subhajit

doi:10.1140/epjp/s13360-021-01130-7

Cited by 66 publications

(31 citation statements)

References 98 publications

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“…Hence, such a complex structure leads to a modification of the black hole entropy. This idea may have interesting consequences in cosmological and holographic applications [69][70][71][72][73][74][75][76][77][78][79][80]. Nevertheless, it also has interesting implications on the black hole properties itself, since it changes the black hole temperature too [81][82][83].…”

Section: Introductionmentioning

confidence: 99%

Constraints on Barrow Entropy from M87* and S2 Star Observations

et al. 2022

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We use data from M87* central black hole shadow, as well as from the S2 star observations, in order to extract constraints on Barrow entropy. The latter is a modified entropy arising from quantum-gravitational effects on the black hole horizon, quantified by the new parameter Δ. Such a change in entropy leads to a change in temperature, as well as to the properties of the black hole and its shadow. We investigate the photon sphere and the shadow of a black hole with Barrow entropy, and assuming a simple model for infalling and radiating gas we estimate the corresponding intensity. Furthermore, we use the radius in order to extract the real part of the quasinormal modes, and for completeness we investigate the spherical accretion of matter onto the black hole, focusing on isothermal and polytropic test fluids. We extract the allowed parameter region, and by applying a Monte-Carlo-Markov Chains analysis we find that Δ≃0.0036−0.0145+0.0792. Hence, our results place the upper bound Δ≲0.0828 at 1σ, a constraint that is less strong than the Big Bang Nucleosynthesis one, but significantly stronger than the late-time cosmological constraints.

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Section: Introductionmentioning

confidence: 99%

Constraints on Barrow Entropy from M87* and S2 Star Observations

et al. 2022

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“…When the IR cutoff was chosen as the Hubble horizon, a new BHDE was proposed [79]. Then, the thermodynamics of this new BHDE with an interaction term was studied [80]. However, this new BHDE is unstable since its squared sound speed is negative [79].…”

Section: Introductionmentioning

confidence: 99%

Dynamical analysis and statefinder of Barrow holographic dark energy

Huang

et al. 2021

Eur. Phys. J. C

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Based on the holographic principle and the Barrow entropy, Barrow holographic dark energy had been proposed. In order to analyze the stability and the evolution of Barrow holographic dark energy, we, in this paper, apply the dynamical analysis and statefinder methods to Barrow holographic dark energy with different IR cutoff and interacting terms. In the case of using Hubble horizon as IR cutoff with the interacting term $$Q=\frac{\lambda }{H}\rho _{m}\rho _{D}$$ Q = λ H ρ m ρ D , we find this model is stable and can be used to describe the whole evolution of the universe when the energy transfers from the pressureless matter to the Barrow holographic dark energy. When the dynamical analysis method is applied to this stable model, an attractor corresponding to an accelerated expansion epoch exists and this attractor can behave as the cosmological constant. Furthermore, the coincidence problem can be solved in this case. Then, after using the statefinder analysis method to this model, we find this model can be discriminated from the standard $$\Lambda $$ Λ CDM model. Finally, we have discussed the turning point of Hubble diagram in Barrow holographic dark energy and find the turning point does not exist in this model.

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“…The BHDE scenario is constrained by the authors in a paper [ 49 ] using observational data coming from the Supernovae (SNIa) Pantheon sample along with precise observations of the Hubble parameter from cosmic chronometers sample. In a recent paper [ 50 ], an interacting BHDE model has been proposed using Barrow entropy. They investigated the evolution of a spatially flat FLRW universe made up of pressure-less DM and BHDE that interacted via a well-motivated interaction term.…”

Section: Introductionmentioning

confidence: 99%

An exact solution approach to warm inflation using Tsallis and Barrow holographic dark energy entropy within Rastall gravity

2022

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This paper studies the phenomena of warm inflation in a modified cosmological scenario within Rastall gravity. In this context, we modify the standard Friedmann equations using recently proposed Tsallis and Barrow holographic dark energy entropies, alternatively. For both entropies, the exact solutions including the inflaton field, potential required to produce inflation and the scale factor are obtained under slow-roll approximation for low- and high-dissipative regimes. We obtain exponentially growing scale factors for both dark energy models. To confront the theoretical predictions of these models with recent observational data, we calculate the slow-roll parameters, number of e-folds, scalar spectral index, running of scalar spectral index and the tensor-to-scalar ratio for both extremes of dissipation. The Planck bounds on inflationary trajectories are being used to constraint the free parameters. The results are interesting and physically viable up to 2 level.

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Dynamics of an interacting Barrow holographic dark energy model and its thermodynamic implications

Cited by 66 publications

References 98 publications

Constraints on Barrow Entropy from M87* and S2 Star Observations

Constraints on Barrow Entropy from M87* and S2 Star Observations

Dynamical analysis and statefinder of Barrow holographic dark energy

An exact solution approach to warm inflation using Tsallis and Barrow holographic dark energy entropy within Rastall gravity

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