论文标题
从几何标量调整引力理论中相互作用的粘性深色流体的标量场统一
Scalar field unification of interacting viscous dark fluid from a geometrical scalar-tensor theory of gravity
论文作者
论文摘要
我们在最近引入的新一类不变的几何标量调整重力理论的框架中研究了粘性深色流体可以通过单个标量场来描述粘性深色流体的可能性。因此，我们开发了一个模型，其中度量张量和标量场都具有几何形式。标量场的特征在于非典型的动力学项，而深色流体的标量粘度很快就不再是规范性的。标量粘度被认为是哈勃和减速参数的函数。为了说明形式主义，我们考虑了两种情况：状态参数的常数和热力学方程。在这两种情况下，我们都会获得标量场及其各自潜力的分析表示。我们通过与一些Planck 2018结果进行比较来界定免费参数。
We investigate, in the framework of a recently introduced new class of invariant geometrical scalar-tensor theory of gravity, the possibility that a viscous dark fluid can be described in a unified manner by a single scalar field. Thus we developed a model in which both the metric tensor and the scalar field have geometrical origin. The scalar field is characterized by a non-canonical kinetic term and the scalar viscosity of the dark fluid appears as soon the kinetic energy of the scalar field is no longer canonical. The scalar viscosity is considered as a function of the Hubble and the deceleration parameters. To illustrate the formalism we have considered two cases: a constant and a thermodynamic equation of state parameters. In the both cases we obtain analytic representations for the scalar field and their respective potentials. We delimit free parameters by comparing with some Planck 2018 results.
