Barrow holographic dark energy with Granda–Oliveros cutoff

Abstract

A study on the effects of implementing the Granda–Oliveros infrared cutoff in the recently introduced Barrow holographic dark energy model is presented, and its cosmological evolution is investigated. We find how the deformation parameter, , affects the evolution of H ( z ) and that from this model it is possible to obtain an accelerated expansion regime of the universe at late times. We also observe that increasing causes a transition of the EoS parameter from quintessence to phantom regimes. In addition, we show that the model can be used to describe the know eras of dominance. Finally, after studying the stability of the proposed model, a fit of the corresponding parameters is preformed, utilizing the measurements of the expansion rate of the universe, H ( z ). The best fit of the parameters is found to be at C.L., for which the Bekenstein–Hawking relation is favored.

Holographic energy density, dark energy sound speed, and tensions in cosmological parameters: H0 and S8

“…MCMC results for the first part of our analysis constraining the background evolution are summarised in figure 6 and table 2. Mean values for the HDE parameters α and β are in good agreement with previous works using different data sets [57,67,83]. Although we do not put any hard bound for α and β in our MCMC analysis, in figure 6 we can clearly see that there are no samples in the region satisfying α < 2β.…”

Viscous cosmology in holographic dark energy with Granda–Oliveros cut-off

“…Granda and Oliveros [19] came up with a new IR cut-off which is a combination of the Hubble parameter and its time derivative to solve the causality problem. This cut-off has been studied by many authors [20][21][22][23][24][25][26][27][28][29][30][31][32][33] to explain the presentday evolution of the Universe.…”