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Observational constraints on Barrow holographic dark energy

Fotios K. Anagnostopoulos
(
- Athens U.
)
,
Spyros Basilakos
(
- RCAAM, Academy of Athens
)
,
Emmanuel N. Saridakis
(
- Athens Observ. and
- Natl. Tech. U., Athens and
- USTC, Hefei
)

May 20, 2020

15 pages

Published in:

Eur.Phys.J.C 80 (2020) 9, 826

Published: Sep 5, 2020

e-Print:

2005.10302 [gr-qc]

DOI:

10.1140/epjc/s10052-020-8360-5

View in:

ADS Abstract Service

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Abstract: (Springer)

We use observational data from Supernovae (SNIa) Pantheon sample, as well as from direct measurements of the Hubble parameter from the cosmic chronometers (CC) sample, in order to extract constraints on the scenario of Barrow holographic dark energy. The latter is a holographic dark energy model based on the recently proposed Barrow entropy, which arises from the modification of the black-hole surface due to quantum-gravitational effects. We first consider the case where the new deformation exponent

\Delta

is the sole model parameter, and we show that although the standard value

\Delta =0

, which corresponds to zero deformation, lies within the

1\sigma

region, a deviation is favored. In the case where we let both

\Delta

and the second model parameter to be free we find that a deviation from standard holographic dark energy is preferred. Additionally, applying the Akaike, Bayesian and Deviance Information Criteria, we conclude that the one-parameter model is statistically compatible with

\Lambda \hbox {CDM}

paradigm, and preferred comparing to the two-parameter one. Finally, concerning the present value of the Hubble parameter we find that it is close to the Planck value.

Note:

15 pages, 2 figures, 2 Tables

Modified gravity
Dark energy
observational constraints
Barrow entropy
dark energy: holography
black hole: surface
Hubble constant
cosmological model
supernova
statistical analysis: Bayesian

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