Resonant primordial gravitational waves amplification
Resonant primordial gravitational waves amplification
复制标题
共振原初引力波放大
DOI：
10.1016/j.physletb.2015.11.021
复制
发表时间：
2016
影响因子：
4.4
通讯作者：
Misao Sasaki
中科院分区：
文献类型：
--
作者：
Chunshan Lin;Misao Sasaki
我们提出了一种机制，以规避膨胀模型中的Lyth约束。本文将广义相对论中传统的单场暴胀模型最小限度地推广到极早期宇宙中引力子质量不为零的理论。修改主要影响张量微扰，而标量和矢量微扰是相同的GR与一个单一的标量场至少在线性微扰理论的水平。在再加热阶段，引力子质量相干振荡，导致原初张量微扰的共振放大。再加热后，引力子质量消失，我们恢复了GR。
We propose a mechanism to evade the Lyth bound in models of inflation. We minimally extend the conventional single-field inflation model in general relativity (GR) to a theory with non-vanishing graviton mass in the very early universe. The modification primarily affects the tensor perturbation, while the scalar and vector perturbations are the same as the ones in GR with a single scalar field at least at the level of linear perturbation theory. During the reheating stage, the graviton mass oscillates coherently and leads to resonant amplification of the primordial tensor perturbation. After reheating the graviton mass vanishes and we recover GR.