论文标题
Brans-Dicke理论中的统一的深色流体和宇宙过境模型
Unified Dark Fluid and Cosmic Transit Models in Brans-Dicke Theory
论文作者
论文摘要
一些深色能量宇宙学模型是在广义的Brans-Dicke理论的框架中构建的，该理论包含自我相互作用的势和动态耦合参数。通过统一的状态线性方程来考虑宇宙的黑暗区域。统一的深色流体的参数已受到某种物理基础的约束。由于据信宇宙已经经历了从早期减速到晚期加速的过渡，因此减速参数应在过渡红移时具有签名的翻转行为。我们已经使用了混合量表因子来模拟减速参数的动态行为。基于过渡红移的观测约束，我们构建了四个不同的过渡暗能模型。构造的模型面临观察数据。对于所有模型，研究了动态标量场，Brans-Dicke参数，自相互作用电位的行为。同样，在广义的布兰斯 - 迪克理论的基础上，我们估计了牛顿重力常数的时间变化。
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.
