论文标题
微型重力中的动态暗能量
Dynamical Dark Energy in Minimally Modified Gravity
论文作者
论文摘要
最小修饰的重力是一类模型，只有两个张量的自由度，就像一般相对论一样。使用具有辅助约束的框架，这些模型可以保持动力学的宇宙学背景。因此，约束的形式受到动态暗能量的要求以及避免扰动理论的崩溃的限制。但是，研究FLRW背景周围的线性扰动，结果对导致修饰有效的重力常数或灰尘的不变音速的约束细节非常不敏感。
Minimally modified gravity is a class of models with only the two tensor degrees of freedom as in general relativity. Using the framework with auxiliary constraints these models can maintain a dynamical cosmological background. The form of the constraints is thereby restricted by the requirement of dynamical dark energy and the avoidance of a breakdown of perturbation theory. Studying the linear perturbations around the FLRW background the results are, however, quite insensitive to the details of the constraints leading to a modified effective gravitational constant or a non-vanishing sound speed for dust.
