一个G-暴涨模型的张标比

The tensor-to-scalar ratio in a G-inflation model

讨论了一个与BICEP观测值相符的G-暴涨模型.在该模型中,高阶与低阶拉氏量不会产生相互压低的效应,从而伽利略子的各阶拉氏量都对结果产生贡献.在适当地选取参数值后,该模型的张标比与单场暴涨的结果有一个很小的修正值.重要的是,这一修正使张标比与BICEP观测值一致.

We calculate the tensor-to-scalar ratio in a G-inflation in this paper. In our model, we can avoid the behavior that the contribution of higher order is too much to screen the lower order Lagrangian, or vice versa. Every order Lagrangian of Galileons contribute to the result. Choosing a proper parameter, the tensor-to-scalar ratio of our model is little smaller than the ratio of one field Slow-roll inflation. However, this result can fit much better with BICEP.