Barrow entropic dark energy: A member of generalized holographic dark energy family
Barrow entropic dark energy: A member of generalized holographic dark energy family
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DOI：
10.1016/j.physletb.2021.136844
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发表时间：
2021-12
影响因子：
4.4
通讯作者：
S. Nojiri;S. Odintsov;Tanmoy Paul
中科院分区：
文献类型：
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作者：
S. Nojiri;S. Odintsov;Tanmoy Paul
在广义全息暗能量（HDE）的形式中，全息截止被概括为取决于 L IR= L IR (L p, L˙ p, Lù p,⋯, L f, L˙ f,⋯, a)，其中 L p 和 L f 分别是粒子视界和未来视界，a 是宇宙的尺度因子。基于这种形式主义，我们证明巴罗熵暗能量（DE）模型等效于广义HDE，其中各自的全息截止由两种方式确定：（1）粒子视界及其导数；（2）未来视界及其导数。有趣的是，这种截止结果分别取决于 L p 或 L f 的一阶导数。巴罗熵暗能量和广义 HDE 之间的这种等价性被扩展到巴罗熵的指数允许随着宇宙的宇宙膨胀而变化的情况。在这两种情况下（无论Barrow指数是常数还是随宇宙演化而变化），我们从广义全息的角度确定了有效的状态方程（EoS）参数，通过与Barrow DE EoS参数进行比较，进一步保证了Barrow熵暗能量与广义HDE之间的等价性。
The holographic cut-off, in the formalism of generalized holographic dark energy (HDE), is generalized to depend on L IR= L IR (L p, L˙ p, L¨ p,⋯, L f, L˙ f,⋯, a), where L p and L f are the particle horizon and future horizon respectively, and a is the scale factor of the universe. Based on such formalism, we showed that the Barrow entropic dark energy (DE) model is equivalent to the generalized HDE where the respective holographic cut-off is determined by two ways–(1) in terms of particle horizon and its derivative and (2) in terms of future horizon and its derivative. Interestingly, such cut-off turns out to depend up-to first order derivative of L p or L f respectively. Such equivalence between the Barrow entropic dark energy and the generalized HDE is extended to the scenario where the exponent of the Barrow entropy allows to vary with the cosmological expansion of the universe. In both the cases (whether the Barrow exponent is a constant or varies with the cosmological evolution), we determine effective equation of state (EoS) parameter from the generalized holographic point of view, which, by comparing with the Barrow DE EoS parameter, further ensures the equivalence between the Barrow entropic dark energy and the generalized HDE.