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arXiv 2601.04414gr-qcastro-ph.COhep-th
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分数 holographic 黑暗能量中的未来破裂场景

Future Rip Scenarios in Fractional Holographic Dark Energy

Sardar Vallabhbhai National Institute of Technology(萨达尔·瓦拉巴伊国家技术学院);Vanderbilt University(范德堡大学)

Ayush Bidlan, Paulo Moniz, Oem Trivedi

AI总结:

本文研究了分数 holographic 黑暗能量中大破裂、小破裂和伪破裂的发生机制,通过不同截断方法分析了破裂奇点的条件和影响。

摘要:

在本文中,我们研究了晚期时间宇宙奇点的发生,即在相互作用的分数 holographic 黑暗能量(FHDE)框架内探讨破裂场景。我们的研究从 Granda-Oliveros(GO)截断开始,即 $L=(γH^{2}+δ\dot{H})^{-\frac{1}{2}}$,并强调了允许的 $α$(Lévy 指数)值范围,其中大破裂、小破裂和伪破裂可以发生。特别是,我们强调在允许范围内 $1<α\leq2$ 的分数 Lévy 指数值下会发生大破裂。此外,我们得出结论,伪破裂的发生要求 Lévy 指数为 $α>2$。因此,我们拒绝在 GO 截断下发生伪破裂的可能性。此外,我们证明在 FHDE 配备 GO 截断的情况下,小破裂的发生相当牵强,需要 IR 截断 $L\sim(γH^{2}+g(H))^{-\frac{1}{2}}$ 的特定函数形式,该形式属于更大的 Nojiri-Odintsov(NO)截断类。为了超越 GO 截断的视角,我们研究了配备 Hubble 截断的相互作用 FHDE 框架,即 $L=H^{-1}$,在开发基于 ansatz 的方法来研究小破裂和伪破裂奇点,因为它们在 GO 截断下无法出现。在此方法中,我们将 Hubble 参数 $H(t)$,对应于小破裂和伪破裂,纳入宇宙学参数如状态方程(EoS)和平方声速(SSS)作为宇宙时间 $t$ 的函数。我们生成这些参数在线性和非线性 $Q$ 情况下的数值图表,以补充我们的理论发现。总之,我们的结果强调在 FHDE 框架中,对于非线性 $Q$ 项,在 Hubble 截断下会发生小破裂和伪破裂奇点。

英文摘要:

In this paper, we investigate the occurrence of late-time cosmological singularities, namely, the rip scenarios within the framework of interacting Fractional Holographic Dark Energy (FHDE). We start our investigation with the Granda-Oliveros (GO) cutoff, i.e., $L=(γH^{2}+δ\dot{H})^{-\frac{1}{2}}$, and highlight the range of allowed $α$ (Lévy's index) values for which big, little and pseudo rip can occur. In particular, we highlight the occurrence of a big rip for fractional values of the Lévy's index in the allowed range $1<α\leq2$. Moreover, we conclude that the occurrence of a pseudo-rip requires Lévy's index to be $α>2$. Therefore, we reject the possibility of pseudo-rip within the GO cutoff. Furthermore, we demonstrate that the occurrence of the little rip in FHDE equipped with a GO cutoff is rather contrived and requires a specific functional form of the IR cutoff $L\sim(γH^{2}+g(H))^{-\frac{1}{2}}$, which belongs to a larger class of Nojiri-Odintsov (NO) cutoffs. To extend our perspective beyond the GO cutoff, we investigate the interacting FHDE framework equipped with the Hubble cutoff, i.e., $L=H^{-1}$, in developing an ansatz-based approach to the little and pseudo-rip singularities as they fail to appear in the GO cutoff. Within this approach, we invoke the expression of the Hubble parameter, $H(t)$, which corresponds to the little and pseudo-rip, into the cosmological parameters such as the Equation of State (EoS) and Squared Sound Speed (SSS) as a function of cosmic time $t$. We produce numerical plots of these parameters in both linear and non-linear $Q$ regimes, which supplement our theoretical findings. In summary, our results highlight the occurrence of little and pseudo-rip singularities within a Hubble cutoff for a non-linear $Q$ term within the FHDE framework.

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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