arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.10302gr-qcastro-ph.COhep-th
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巴罗全息暗能量的观测约束

Observational constraints on Barrow holographic dark energy

Fotios K. Anagnostopoulos, Spyros Basilakos, Emmanuel N. Saridakis

摘要:

我们使用超新星(SNIa)万神殿样品的观测数据,以及从宇宙计时器(CC)样品的哈勃参数的直接测量,以提取约束巴罗全息暗能量的情况。后者是一个全息暗能量模型的基础上,最近提出的巴罗熵,这是由于量子引力效应的黑洞表面的修改。我们首先考虑的情况下,新的变形指数$Δ$是唯一的模型参数,我们表明,虽然标准值$Δ=0$,这对应于零变形,位于1 $σ$区域内,偏差是有利的。在我们让$Δ$和第二个模型参数都自由的情况下,我们发现偏离标准全息暗能量是优选的。此外,应用Akaike,贝叶斯和偏差信息准则,我们得出结论,单参数模型是统计兼容的$Λ$ CDM范式,并优于双参数之一。最后,关于哈勃参数的当前值,我们发现它接近普朗克值。

英文摘要:

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 $Δ$ is the sole model parameter, and we show that although the standard value $Δ=0$, which corresponds to zero deformation, lies within the 1$σ$ region, a deviation is favored. In the case where we let both $Δ$ 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 $Λ$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.

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