arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.02337gr-qc
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幻影鸿沟中的物质创造模型

Challenging matter creation models in the phantom divide

Víctor H. Cárdenas, Miguel Cruz, Samuel Lepe, Shin'ichi Nojiri, Sergei D. Odintsov

摘要:

我们进行了研究,统计和理论的宇宙学模型的物质创造和他们的能力,描述有效的幻影模型的暗能量。这种模型超出了$Λ$ CDM模型,因为由此产生的宇宙膨胀不是绝热的。事实上,我们表明,这种方法表现出暂时的幻影/精华的情况下,在目前的时间,并倾向于标准的宇宙学模型在宇宙演化的某个阶段。我们讨论了这类宇宙学模型的热力学性质的一些共性,重点讨论了与暗物质相关的温度行为,它与熵一起在宇宙演化过程中保持正值。通过在流体描述中引入宇宙学常数和耗散效应来探讨它们在宇宙膨胀中的宇宙学后果,从而丰富了这类模型。最后,概括的物质生产率作为一个非均匀的表达哈勃参数及其衍生物进行了讨论,在所有的情况下检查,这样的选举导致一个有效的幻影/精髓行为。

英文摘要:

We perform a study both statistical and theoretical for cosmological models of matter creation and their ability to describe effective phantom models of dark energy. Such models are beyond the $Λ$CDM model since the resulting cosmic expansion is not adiabatic. In fact, we show that this approach exhibits transient phantom/quintessence scenarios at present time and tends to the standard cosmological model at some stage of the cosmic evolution. We discuss some generalities of the thermodynamics properties for this type of cosmological model; we emphasize on the behavior of the temperature associated to dark matter, which keeps positive along cosmic evolution together with the entropy. The enrichment of this type of model by means of the incorporation of cosmological constant and dissipative effects in the fluid description to explore their cosmological consequences in the expansion of the universe is considered. Finally, a generalization for the matter production rate as an inhomogeneous expression of the Hubble parameter and its derivatives is discussed; as in all the cases examined, such election leads to an effective phantom/quintessence behavior.

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