Barrow Holographic Dark Energy in non-flat Universe

Adhikary, Priyanka; Das, Sudipta; Basilakos, Spyros; Saridakis, Emmanuel N.

doi:10.48550/arxiv.2104.13118

Cited by 5 publications

(5 citation statements)

References 52 publications

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“…Later on, [24] investigate the evolution of an interacting holographic dark energy model component under the Barrow's modified entropy. Recently, [25] showed that a non-flat Barrow interacting holographic dark energy can reproduce the thermal history of the Universe. In addition, the authors claim that an open Universe favors an phantom regime for the effective dark energy equation of state.…”

Section: Jcap12(2021)032mentioning

confidence: 99%

Barrow Entropy Cosmology: an observational approach with a hint of stability analysis

León

Magaña

Hernández-Almada

et al. 2021

J. Cosmol. Astropart. Phys.

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In this work, we use an observational approach and dynamical system analysis to study the cosmological model recently proposed by Saridakis (2020), which is based on the modification of the entropy-area black hole relation proposed by Barrow (2020). The Friedmann equations governing the dynamics of the Universe under this entropy modification can be calculated through the gravity-thermodynamics conjecture. We investigate two models, one considering only a matter component and the other including matter and radiation, which have new terms compared to the standard model sourcing the late cosmic acceleration. A Bayesian analysis is performed in which using five cosmological observations (observational Hubble data, type Ia supernovae, HII galaxies, strong lensing systems, and baryon acoustic oscillations) to constrain the free parameters of both models. From a joint analysis, we obtain constraints that are consistent with the standard cosmological paradigm within 2σ confidence level. In addition, a complementary dynamical system analysis using local and global variables is developed which allows obtaining a qualitative description of the cosmology. As expected, we found that the dynamical equations have a de Sitter solution at late times.

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Section: Jcap12(2021)032mentioning

confidence: 99%

Barrow Entropy Cosmology: an observational approach with a hint of stability analysis

León

Magaña

Hernández-Almada

et al. 2021

J. Cosmol. Astropart. Phys.

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“…The validity and the constraints imposed by the generalized second law of thermodynamics, including the matter-energy content and the horizon entropy, have been investigated in [58]. Additionally, the Barrow holographic DE (BHDE) model was proposed in [59][60][61][62] and has been tested against the latest cosmological data in [63,64]. It was found that BHDE describes very efficiently the late accelerated expansion of the universe, having additionally the correct asymptotic behavior [65].…”

Section: Introductionmentioning

confidence: 99%

Growth of Perturbations in Tsallis and Barrow Cosmology

Farsi¹,

Sheykhi²

2022

Preprint

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We disclose the effects of the entropic corrections to the Friedmann equations on the growth of perturbations in the early stages of the Universe. We consider two types of corrections to the area law of entropy, known as Tsallis and Barrow entropies. Using these corrections to entropy, we derive the modified Friedmann equations and explore the growth of perturbations in a flat universe filled with dark energy (DE) and dark matter (DM). We employ the spherically symmetric collapse formalism and work in the liner regime for the perturbations. We first consider the constant equation of state (EoS) parameter for the DE and then extend our study to the variable EoS parameter for DE. Interstingly enough, we find out that the profile of density contrast quite differs from the standard cosmology. We observe that the growth rate of matter perturbations crucially depend on the values of Tsallis and Barrow parameters. With increasing the correction parameters to the entropy, the total density contrast increases as well. This implies that perturbations grow up faster in a universe with modified entropy corrected Friedmann equations.

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“…The validity and the constraints imposed by the generalized second law of thermodynamics, including the matter-energy content and the horizon entropy, were investigated in [58]. Additionally, the Barrow holographic DE (BHDE) model was proposed in [59][60][61][62] and was tested against the latest cosmological data in [63,64]. It was found that BHDE very efficiently describes the late accelerated expansion of the universe, having additionally the correct asymptotic behavior [65].…”

Section: Introductionmentioning

confidence: 99%

Growth of perturbations in Tsallis and Barrow cosmology

Farsi

Sheykhi

2022

Eur. Phys. J. C

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We report the effects of entropic corrections to the Friedmann equations on the growth of perturbations in the early stages of the universe. We consider two types of corrections to the area law of entropy, known as Tsallis and Barrow entropy. Using these corrections to entropy, we derive the modified Friedmann equations and explore the growth of perturbations in a flat universe filled with dark matter (DM) and the cosmological constant. We employ the spherically symmetric collapse formalism and work in the linear regime for the perturbations. Interestingly enough, we find that the profile of density contrast is quite different from the standard cosmology in Tsallis and Barrow cosmology. We observe that the growth rate of matter perturbations crucially depends on the values of Tsallis and Barrow parameters. By increasing these entropy correction parameters, the total density contrast increases as well. This implies that perturbations grow faster in a universe with modified entropy-corrected Friedmann equations.

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Barrow Holographic Dark Energy in non-flat Universe

Cited by 5 publications

References 52 publications

Barrow Entropy Cosmology: an observational approach with a hint of stability analysis

Barrow Entropy Cosmology: an observational approach with a hint of stability analysis

Growth of Perturbations in Tsallis and Barrow Cosmology

Growth of perturbations in Tsallis and Barrow cosmology

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