arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.09885gr-qcastro-ph.CO
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理解相互作用的暗能量场景的现象学及其理论界限

Understanding the phenomenology of interacting dark energy scenarios and their theoretical bounds

Supriya Pan, Jaume de Haro, Weiqiang Yang, Jaume Amorós

摘要:

在空间平坦的Friedmann-Lemaintre-Robertson-Walker(FLRW)宇宙中,研究了暗物质与暗能量之间的非引力相互作用.假设相互作用速率与暗物质和暗能量的能量密度成线性关系,并且与FLRW宇宙的哈勃速率成正比。这种相互作用模型导致一个自治的线性动力系统,并根据耦合参数,可以通过计算矩阵的指数,定义系统解析求解。我们在这里表明,这种相互作用率有一个非常深的联系与一些著名的宇宙学理论。然后,我们调查的相互作用率的耦合参数的理论界限,以使能量密度的黑暗部门保持积极的整个宇宙的演化和渐近收敛到零在很晚的时候。我们的分析还指出,这种线性相互作用模型可能会遇到有限时间的未来奇点依赖于耦合参数以及暗能量状态参数。

英文摘要:

Non-gravitational interaction between dark matter and dark energy has been considered in a spatially flat Friedmann-Lemaître-Robertson-Walker (FLRW) universe. The interaction rate is assumed to be linear in the energy densities of dark matter and dark energy and it is also proportional to the Hubble rate of the FLRW universe. This kind of interaction model leads to an autonomous linear dynamical system, and depending on the coupling parameters, could be solved analytically by calculating the exponential of the matrix, defining the system. We show here that such interaction rate has a very deep connection with some well known cosmological theories. We then investigate the theoretical bounds on the coupling parameters of the interaction rate in order that the energy densities of the dark sector remain positive throughout the evolution of the universe and asymptotically converge to zero at very late times. Our analyses also point out that such linear interacting model may encounter with finite time future singularities depending on the coupling parameters as well as the dark energy state parameter.

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