论文标题
仅具有标量模式
Stable, non-singular bouncing universe with only a scalar mode
论文作者
论文摘要
在本文中，我们研究了一类较高衍生的，非本地重力，该重力在没有物质的情况下接受了同质和各向同性的非潜在的，弹跳的宇宙。在线性化的层面上，该理论仅传播标量的自由度，而没有向量或张量模式。标量可以摆脱扰动的幽灵不稳定性，并在整个弹跳中具有振荡和有限的进化。
In this paper, we study a class of higher derivative, non-local gravity which admits homogeneous and isotropic non-singular, bouncing universes in the absence of matter. At the linearized level, the theory propagates only a scalar degree of freedom, and no vector or tensor modes. The scalar can be made free from perturbative ghost instabilities, and has oscillatory and bounded evolution across the bounce.
