论文标题

$λ$ CDM背景宇宙学中的DISFYRAL耦合

Disformal couplings in a $Λ$CDM background cosmology

论文作者

Dusoye, Avishek, de la Cruz-Dombriz, Alvaro, Dunsby, Peter, Nunes, Nelson J.

论文摘要

此处对带有异形耦合的耦合典型模型进行处理,以模仿$λ$ cdm的背景。使用这种方法,不必指定典型电位。该模型认为一种通用流体与挑选性相结合,该液体指定为暗物质或相对论流体。背景由宇宙常数和另一种未偶联的通用流体组成,以适应三种研究的情况。研究了耦合的挑选模型的宇宙学动力学,其异形耦合取决于两种通用流体的状态方程。两种通用流体都是暗物质的情况,已进一步分析模仿模型的扩展历史。该分析证实,典型的质量尺度会影响动力系统的非正式特征,这是通过有效的保形耦合的演变所描绘的。

The coupled quintessence model with disformal couplings is treated here to mimic the $Λ$CDM background. Using this approach, the quintessence potential does not have to be specified. The model considers a generic fluid coupled to the quintessence, which is specified to be either dark matter or a relativistic fluid. The background consists of a cosmological constant and another uncoupled generic fluid, to cater for three studied scenarios. The cosmological dynamics is investigated for the coupled quintessence model, whose disformal couplings depend on the equation of state of both generic fluids. The scenario, whereby both generic fluids are dark matter, was further analyzed for an expansion history of the mimicking model. The analysis confirms that the mass scale of the quintessence influences the disformal characteristics of the dynamical system, which is portrayed by the evolution of an effective conformal coupling.

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