论文标题
大撕裂中的对称动力学重力编织理论
Big rip in shift-symmetric Kinetic Gravity Braiding theories
论文作者
论文摘要
我们修改了一组名为动力学重力编织模型的标量调整理论的未来命运。众所周知，如果相应的Lagrangian在标量领域不断变化下，这些理论可以安全地将宇宙扩展到未来的Sitter状态。但是，这并不是我们在这封信中显示的这些换档对称模型的唯一可能的状态。实际上，以能量密度发散为特征的未来宇宙奇异性也可以在此框架中出现。我们提供了一个明确的例子，其中巨大的RIP奇点是宇宙的唯一可能的命运。
We revise the future fate of a group of scalar-tensor theories known as kinetic gravity braiding models. As it is well-known, these theories can safely drive the expansion of the universe towards a future de Sitter state if the corresponding Lagrangian is invariant under constant shifts in the scalar field. However, this is not the only possible future state of these shift-symmetric models as we show in this letter. In fact, future cosmic singularities characterized by a divergence of the energy density can also appear in this framework. We present an explicit example where a big rip singularity is the only possible future fate of the cosmos.
