论文标题
Brans-Dicke单型重力
Brans-Dicke unimodular gravity
论文作者
论文摘要
我们提出了布兰斯·迪克（Brans-Dicke）理论的单型版本，设计的拉格朗日公式有限。最终的场方程是无关的。宇宙学背景中的真空解决方案再现了通常的布兰斯 - 迪克理论的相应解决方案，但具有宇宙恒定的术语。对标量模式进行了扰动分析，并且稳定和不稳定的配置与Brans-Dicke案例相反，仅发生稳定配置。另一方面，该理论中的紧张模式与传统的布兰斯 - 迪克理论相同。
We propose a unimodular version of the Brans-Dicke theory designed with a constrained Lagrangian formulation. The resulting field equations are traceless. The vacuum solutions in the cosmological background reproduce the corresponding solutions of the usual Brans-Dicke theory but with a cosmological constant term. A perturbative analysis of the scalar modes is performed and stable and unstable configurations appear in contrast with the Brans-Dicke case for which only stable configurations occur. On the other hand, tensorial modes in this theory remains the same as in the traditional Brans-Dicke theory.
