论文标题
非最小耦合曲面
Non-minimally coupled curvaton
论文作者
论文摘要
我们研究了两场通货膨胀模型，其中通过非微小耦合与重力耦合的观众场产生标量宇宙学的存在，并特别强调了库尔瓦顿场景。这些模型的主要优点是可以通过非最小耦合来调整观众光谱指数。我们的模型自然产生了观测值所需的绝热扰动的红色光谱。我们研究非最小耦合如何影响曲面场景中产生的曲率扰动的光谱。特别是，我们发现，对于小的，负的非微小耦合，光谱指数的贡献在非微小耦合中是负和线性的。由于以这种方式，曲率光谱变为红色，因此可以保存一些库尔瓦顿场景，否则将排除。在电力定律通货膨胀中，我们发现排除了大型的非最小耦合，因为它给出了统一顺序的主慢滚参数。最后，我们指出，非微小耦合会影响观众扰动的促进后生长，并以这种方式影响曲caton机制的有效性。
We investigate two-field inflationary models in which scalar cosmological pertubations are generated via a spectator field nonminimally coupled to gravity, with the particular emphasis on curvaton scenarios. The principal advantage of these models is in the possibility to tune the spectator spectral index via the nonminimal coupling. Our models naturally yield red spectrum of the adiabatic perturbation demanded by observations. We study how the nonminimal coupling affects the spectrum of the curvature perturbation generated in the curvaton scenarios. In particular we find that for small, negative nonminimal couplings the spectral index gets a contribution that is negative and linear in the nonminimal coupling. Since in this way the curvature spectrum becomes redder, some of curvaton scenarios can be saved, which would otherwise be ruled out. In the power law inflation we find that a large nonminimal coupling is excluded since it gives the principal slow roll parameter that is of the order of unity. Finally, we point out that nonminimal coupling can affect the postinflationary growth of the spectator perturbation, and in this way the effectiveness of the curvaton mechanism.
