arXiv 2004.010272020-04-01gr-qchep-th

Brans-Dicke理论中统一的暗流体和宇宙凌日模型

Unified Dark Fluid and Cosmic Transit Models in Brans-Dicke Theory

S. K. Tripathy, Sasmita K Pradhan, Z. Naik, D. Behera, B. Mishra

备注：: 17pages, 12 figures
发表信息：: Phys.Dark Univ., 30 (2020) 100722
DOI：: 10.1016/j.dark.2020.100722

摘要：

在包含自相互作用势和动力学耦合参数的广义Brans-Dicke理论框架下，建立了一些暗能量宇宙学模型.通过统一的线性状态方程来考虑宇宙的暗区。统一暗流体的参数从一定的物理基础上得到了约束。由于宇宙被认为经历了从早期减速到晚期加速的转变，减速参数在转变红移处应该有一个签名翻转行为。我们使用了一个混合比例因子来模拟减速参数的动态行为。基于对跃迁红移的观测约束，我们构造了四种不同的跃迁暗能量模型。所构建的模型面临的观测数据。对于所有模型，我们研究了动力学标量场、Brans-Dicke参量、自相互作用势的行为。在广义Brans-Dicke理论的基础上，我们估计了牛顿引力常量的时间变化。

英文摘要：

Some dark energy cosmological models are constructed in the framework of a generalised Brans-Dicke theory which contains a self interacting potential and a dynamical coupling parameter. The dark sector of the universe is considered through a unified linear equation of state. The parameters of the unified dark fluid have been constrained from some physical basis. Since the universe is believed to have undergone a transition from an early deceleration to a late time acceleration, the deceleration parameter should have a signature flipping behaviour at the transition redshift. We have used a hybrid scale factor to simulate the dynamical behaviour of the deceleration parameter. Basing upon the observational constraints on the transition redshift, we have constructed four different transitioning dark energy models. The constructed models are confronted with observational data. For all the models, the behaviour of the dynamical scalar field, Brans-Dicke parameter, Self interacting potential are investigated. Also, on the basis of the generalised Brans-Dicke theory, we have estimated the time variation of the Newtonian gravitational constant.

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