A study of holographic dark energy models using configuration entropy

Das, Biswajit; Pandey, Biswajit

doi:10.48550/arxiv.2011.07337

Cited by 6 publications

(6 citation statements)

References 41 publications

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“…is just a sub-case of the generalized entropy expression introduced in [ 32 , 33 ]. Other studies on the cosmological consequences of the Barrow entropy were carried out in [ 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 ].…”

Section: Introductionmentioning

confidence: 99%

Holographic Dark Energy in Modified Barrow Cosmology

Sheykhi

Hamedan

2023

Entropy

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Thermodynamics–gravity conjecture implies that there is a deep connection between the gravitational field equations and the first law of thermodynamics. Therefore, any modification to the entropy expression directly modifies the field equations. By considering the modified Barrow entropy associated with the apparent horizon, the Friedmann equations are modified as well. In this paper, we reconsider the holographic dark energy (HDE) model when the entropy is in the form of Barrow entropy. This modification to the entropy not only changes the energy density of the HDE but also modifies the Friedmann equations. Therefore, one should take into account the modified HDE in the context of modified Friedmann equations. We study the Hubble horizon and the future event horizon as IR cutoffs and investigate the cosmological consequences of this model. We also extend our study to the case where dark matter (DM) and dark energy (DE) interact with each other. We observe that Barrow exponent δ significantly affects the cosmological behavior of HDE, and in particular, the equation of state (EoS) parameter can cross the phantom line (wde<−1). Additionally, adding δ remarkably affects the deceleration parameter and shifts the time of universe phase transition.

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Section: Introductionmentioning

confidence: 99%

Holographic Dark Energy in Modified Barrow Cosmology

Sheykhi

Hamedan

2023

Entropy

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“…On the other hand, it was recently proven that Barrow entropy as well as any other known entropy (Tsalis, Renyi, Kaniadakis, etc) is just sub-case of generalized entropy expression introduced in [5,6]. Other studies on the cosmological consequences of the Barrow entropy can be carried out in [7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Modified cosmology through Barrow entropy

Sheykhi¹

2022

Preprint

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We investigate the cosmological consequences of the modified Friedmann equations when the entropy associated with the apparent horizon, given by Barrow entropy, S ∼ A 1+δ/2 , where 0 ≤ δ ≤ 1, represents the amount of the quantum-gravitational deformation of the horizon. We study implications of this model in a flat Friedmann-Robertson-Walker (FRW) universe with/without cosmological constant. Taking the cosmological constant into account, this model can describe the current accelerated expansion, although the transition from deceleration phase to the acceleration phase takes place in the lower redshifts. We investigate the evolution of the scale factor and show that with increasing δ, the value of scale factor increases as well. We also estimate the age of the universe in Barrow cosmology which is smaller than the age of the universe in standard cosmology. Finally, using the Jeans's analysis, we briefly study the density perturbation profile in the context of Barrow cosmology.

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“…On the other hand, it was recently proven that Barrow entropy as well as any other known entropy (Tsalis, Renyi, Kaniadakis, etc) is just sub-case of generalized entropy expression introduced in [32,33]. Other studies on the cosmological consequences of the Barrow entropy can be carried out in [34][35][36][37][38][39][40][41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Holographic dark energy in modified Barrow cosmology

Sheykhi¹,

Hamedan²

2022

Preprint

View full text Add to dashboard Cite

Thermodynamics-Gravity conjecture implies that there is a deep connection between the gravitational field equations and the first law of thermodynamics. Therefore, any modification to the entropy expression, directly modifies the field equations. By considering the modified Barrow entropy associated with the apparent horizon, the Friedmann equations get modified as well. In this paper, we reconsider the holographic dark energy (HDE) model when the entropy is in the form of Barrow entropy. This modification to the entropy not only changes the energy density of HDE, but also modifies the Friedmann equations. Therefore, one should take into account the modified HDE in the context of modified Friedmann equations. We study the Hubble horizon and the future event horizon as IR cutoffs, and investigate the cosmological consequences of this model. We also extend our study to the case where dark matter (DM) and dark energy (DE) interact with each other. We observe that Barrow exponent δ significantly affects the cosmological behavior of HDE, and in particular the equation of state (EoS) parameter can cross the phantom line (w de < −1). Also adding δ remarkably affects the deceleration parameter, and shifts the time of universe phase transition.

show abstract

A study of holographic dark energy models using configuration entropy

Cited by 6 publications

References 41 publications

Holographic Dark Energy in Modified Barrow Cosmology

Holographic Dark Energy in Modified Barrow Cosmology

Modified cosmology through Barrow entropy

Holographic dark energy in modified Barrow cosmology

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