Barrow HDE model for Statefinder diagnostic in non-flat FRW universe

Dixit, Archana; Bhardwaj, Vinod Kumar; Pradhan, Anirudh

doi:10.1016/j.cjph.2021.08.016

Cited by 20 publications

(2 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Put another way, for the different approximations Λ, the trajectory starts early in the (Quintessenceperiod) and finishes late, nearing ΛCDM. This supports [69] and hence indicates that the early and late time universes may be unified. [45] has another notable study that is pertinent to this one.…”

Section: Discussionsupporting

confidence: 71%

Cosmology of Barrow holographic QCD ghost dark energy and a look into the thermodynamics

Altaibayeva,

Chattopadhyay,

Umurzakhova

2024

Phys. Scr.

View full text Add to dashboard Cite

The present study endeavours to study the cosmology of QCD ghost dark energy based on Barrow holographic ﬂuid, a particular example of Nojiri-Odintsov holographic dark energy (General Relativity and Gravitation, 2006, 38, pp.1285-1304; The European Physical Journal C, 2017, 77, pp.1-8.). The Hubble parameter is reconstructed and according the equation of state parameter is reconstructed for the Barrow holographic QCD ghost dark energy. It is observed that the eﬀective equation of state parameter has a transition from quintessence to phantom and for the current universe the equation of state parameter is very close to −1. The deceleration parameter is computed based on the reconstructed Hubble parameter and it is observed that the model can have a transition from decelerated to accelerated universe. The stateﬁnder trajectories are plotted and an interpolation between dust and ΛCDM phases is observed. Finally, the thermodynamics is studied considering apparent horizon as the enveloping horizon of the universe.

show abstract

Section: Discussionsupporting

confidence: 71%

Cosmology of Barrow holographic QCD ghost dark energy and a look into the thermodynamics

Altaibayeva,

Chattopadhyay,

Umurzakhova

2024

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…This entropy model has later been considered as a model for holographic dark energy [387,388] (see also Refs. [389][390][391][392][393][394][395][396][397][398][399][400][401][402][403][404][405][406][407][408]). In the toy model considered, a three-dimensional FIG.…”

Section: T Barrow Entropy Modifications To the Schwarzschild Metricmentioning

confidence: 99%

Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A$^*$

Vagnozzi¹,

Roy²,

Tsai³

et al. 2022

Preprint

View full text Add to dashboard Cite

Horizon-scale images of black holes (BHs) and their shadows have opened an unprecedented window onto tests of gravity and fundamental physics in the strong-field regime, allowing us to test whether the Kerr metric provides a good description of the space-time in the vicinity of the event horizons of supermassive BHs. We consider a wide range of well-motivated deviations from classical General Relativity solutions, and constrain them using the Event Horizon Telescope (EHT) observations of Sagittarius A * (SgrA * ), connecting the size of the bright ring of emission to that of the underlying BH shadow and exploiting high-precision measurements of SgrA * 's mass-to-distance ratio. The scenarios we consider, and whose fundamental parameters we constrain, include various regular BH models, string-and non-linear electrodynamics-inspired space-times, scalar field-driven violations of the no-hair theorem, alternative theories of gravity, new ingredients such as the generalized uncertainty principle and Barrow entropy, and BH mimickers including examples of wormholes and naked singularities. We demonstrate that SgrA * 's image places particularly stringent constraints on models predicting a shadow size which is larger than that of a Schwarzschild BH of a given mass: for instance, in the case of Barrow entropy we derive constraints which are significantly tighter than the cosmological ones. Our results are among the first tests of fundamental physics from the shadow of SgrA * and, while the latter appears to be in excellent agreement with the predictions of General Relativity, we have shown that various well-motivated alternative scenarios (including BH mimickers) are far from being ruled out at present.

show abstract