论文标题
潜在驱动的通货膨胀与重力偶联
Potential-driven Inflation with Disformal Coupling to Gravity
论文作者
论文摘要
在本文中，我们研究了具有与爱因斯坦重力偶联的潜在驱动通货膨胀模型，以找出这种耦合对这些模型的影响。我们考虑了一种简单的耦合形式，该形式仅引入一个参数，三个通胀模型，即混乱的通货膨胀，希格斯通货膨胀和单片膨胀。我们发现，异形耦合可能会对这些模型的观察变量进行一些修改，例如功率谱，频谱索引以及张量/标量比，尽管由于对偶数偶联参数的约束，但不太大。通过这些修改，人们有机会改善位于普朗克观察数据（例如单片通货膨胀）的有利区域边缘的模型。此外，由于引力和动力学术语的耦合，可能会出现张量扰动的非平凡声速（引力波）。
In this paper, we investigate the potential-driven inflation models with a disformal coupling to Einstein Gravity, to find out the effects of such a coupling on these models. We consider a simple coupling form which introduces only one parameter, and three inflation models, namely the chaotic inflation, the Higgs inflation, and the monodromy inflation. We find that the disformal coupling can have some modifications to the observational variables of these models such as the power spectrum, the spectral index as well as the tensor/scalar ratio, although not too large due to the constraints on the disformal coupling parameter. With these modifications, one has the opportunity of improving models that lie on the edge of the favorable regions of Planck observational data, such as monodromy inflation. Moreover, the non-trivial sound speed of tensor perturbations (gravitational waves) may come out, due to the coupling of gravity and kinetic terms of the field.
