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arXiv 2006.04339gr-qcastro-ph.CO
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Tsallis和Rényi全息暗能量与混合展开律的相互作用

Interacting Tsallis and Rényi Holographic Dark Energy with Hybrid Expansion Law

Snehasish Bhattacharjee

摘要:

该手稿介绍了Tsallis全息暗能量(THDE)和Rényi全息暗能量(RHDE)的动力学,该动力学由FRW时空中的非线性相互作用和复合幂律指数(混合)形式演化的标度因子来描述。为了构建这些全息暗能量模型的能量密度,我假设哈勃截止是红外极限。我发现减速参数在红移$z$处经历了与观测一致的签名翻转。两种HDE模型的EoS参数$ω_{de}$表现出截然不同的动力学行为,尽管假设值接近于$z=0$下的$-1$,因此与当前的观测结果一致。接下来,我发现平方声速$c_{s}^{2}$是积极的THDE模型,确保对扰动的稳定性,而RHDE模型,$c_{s}^{2}<0$意味着对扰动的不稳定性。通过构造$ω_{de}-ω_{de}^{'}$平面,分析了HDE模型的EoS参数的演化行为,发现THDE模型的EoS参数处于冻结区,RHDE模型的EoS参数处于解冻区。

英文摘要:

The manuscript presents the dynamics of Tsallis holographic dark energy (THDE) and Rényi holographic dark energy (RHDE) prescribed by a non-linear interaction in the FRW spacetime and for a scale factor evolving with a composite power law-exponential (hybrid) form. To construct the energy densities of these holographic dark energy models, I assume the Hubble cutoff to be the IR limit. I find that the deceleration parameter undergoes a signature flipping at a redshift $z$ consistent with observations. The EoS parameter $ω_{de}$ for both the HDE models exhibit quite contrasting dynamical behavior despite assuming values close to $-1$ at $z=0$ and therefore consistent with current observations. Next, I find the squared sound speed $c_{s}^{2}$ to be positive for the THDE model ensuring stability against perturbations, whereas for the RHDE model, $c_{s}^{2}<0$ implying instability against perturbations. Furthermore, I analyzed the evolutionary behavior of the EoS parameter of the HDE models by constructing the $ω_{de}-ω_{de}^{'}$ plane and find that the plane lies in the freezing region for the THDE model and in the thawing region for the RHDE model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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