Observational constraints on Barrow holographic dark energy
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Regular Article - Theoretical Physics
Observational constraints on Barrow holographic dark energy Fotios K. Anagnostopoulos1,a , Spyros Basilakos2 , Emmanuel N. Saridakis3,4,5,b 1
Department of Physics, National and Kapodistrian University of Athens, Zografou Campus GR, 15773 Athens, Greece Research Center for Astronomy and Applied Mathematics, Academy of Athens, Soranou Efesiou 4, 11527 Athens, Greece 3 National Observatory of Athens, Lofos Nymfon, 11852 Athens, Greece 4 Department of Physics, National Technical University of Athens, Zografou Campus GR, 15773 Athens, Greece 5 Department of Astronomy, School of Physical Sciences, University of Science and Technology of China, Hefei 230026, People’s Republic of China
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Received: 28 July 2020 / Accepted: 14 August 2020 © The Author(s) 2020
Abstract 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 is the sole model parameter, and we show that although the standard value = 0, which corresponds to zero deformation, lies within the 1σ region, a deviation is favored. In the case where we let both 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 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.
Contents 1 Introduction . . . . . . . . . . 2 Barrow holographic dark energy 3 Data and methodology . . . . . 3.1 Cosmological probes . . . 3.1.1 Type Ia Supernovae . 3.1.2 Cosmic chronometers 3.1.3 Joint analysis . . . .
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a e-mail:
[email protected]
b e-mail:
[email protected] (corresponding author)
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3.2 Information criteria and model selection 4 Observational constraints . . . . . . . . . . 5 Conclusions . . . . . . . . . . . . . . . . . References . . . . . . . . . . . . . . . . . . . .
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1 Introduction Accumulated data from various probes lead to the safe deduction that the universe have undergone two phases of accelerated expansion, at early and late cosmological times respectively. Such a behavior may require the introduction of extra degrees of freedom that are capable of triggering it (the simple cosmological constant ca
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