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Cosmological evolution of non-interacting and interacting holographic dark energy model in Brans-Dicke theory

机译:浅谈浅谈浅互动和互动暗能模型的宇宙论演变

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The purpose of this paper is to study the dynamics of non-interacting and interacting holographic dark energy (HDE) models in the framework of Brans-Dicke (BD) cosmology. As system's infrared cutoff, we consider the future event horizon. The scalar function of BD theory is assumed to be a logarithmic form of scale factor, which is claimed to avoid a constant result for deceleration parameter. We investigate the cosmological implications of this model in detail. We obtain the time-dependent equation of state parameter and deceleration parameter which describe the phase transition of the Universe. We observe that the model explains the early time inflation and late time acceleration including matter-dominated phase. It is also observed that the equation of state parameter may cross phantom divide line in late time evolution. The cosmic coincidence problem is also discussed for both the models. We observe that this logarithmic form of Brans-Dicke scalar field is more appropriate to achieve a less acute coincidence problem in non-interacting model whereas a soft coincidence can be achieved if coupling parameter in interacting model has small value.
机译:本文的目的是研究在Brans-Dicke(BD)宇宙框架框架中的非交互和相互作用的全息暗能(HDE)模型的动态。作为系统的红外截止,我们考虑了未来的事件范围。假设BD理论的标量函数是比例因子的对数形式,其被要求避免减速度参数的恒定结果。我们详细探讨了该模型的宇宙学影响。我们获得了描述宇宙的相位过渡的状态参数和减速参数的时间相关方程。我们观察到该模型解释了早期通胀和晚期加速,包括重要阶段。还观察到,状态参数的等式可以在晚时进化中跨幻划分线。宇宙巧合问题也用于两种模型。我们观察到,这种对数形式的麸皮标量场更适合于在非交互模型中实现较少的急性重合问题,而如果交互模型中的耦合参数具有小的值,则可以实现软巧合。

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