论文标题
Horndeski标量场重力模型的稳定性条件
Stability Conditions for the Horndeski Scalar Field Gravity Model
论文作者
论文摘要
我们通过诉诸于Witten的正能定理，限制了用等效的广义Galileon版本写的Horndeski Gravity的可行模型。我们发现，拉格朗日中的免费函数$ g_3（ϕ，x）$被限制为仅是标量字段的函数，$ g_3（ϕ）$，并且找到了免费功能之间的关系。还分析了其他稳定标准，例如重力的吸引力，Dolgov-Kawasacki不稳定性和能量条件。讨论了一些宇宙学应用程序
We constrain the viable models of Horndeski gravity, written in its equivalent Generalised Galileon version, by resorting to the Witten positive energy theorem. We find that the free function $G_3(ϕ, X)$ in the Lagrangian is constrained to be a function solely of the scalar field, $G_3(ϕ)$, and relations among the free functions are found. Other criterion for stability are also analysed, such as the attractiveness of gravity, the Dolgov-Kawasacki instability and the energy conditions. Some applications for Cosmology are discussed
