标题： 非奇异高曲率宇宙学中的结构形成 显示英文标题

标题： Structure Formation in Non-singular Higher Curvature Cosmology

摘要： 我们提出基于非奇异高曲率宇宙学模型的新结构形成情景。 该模型受弦理论中出现的$R^2$标量场耦合的启发，在我们的场景中，宇宙没有开始也没有结束。 我们给出了两个例子，其中参数值与当前宇宙结构观测一致。 在第一个例子中，结构的起源是由于混沌暴胀期间的绝热扰动，而在第二个例子中，超暴胀时期的等曲率非高斯扰动导致了结构的形成。 在第二种情况下，有可能生成尺度与星系核预期相当的原初超大质量黑洞。 显示英文摘要

摘要： We propose novel structure formation scenarios based on a non-singular higher curvature cosmological model. The model is motivated by the $R^2$ coupling of a scalar field appearing in the string theory, and in our scenarios the universe has no beginning and no end. We give two examples with explicit parameter values which are consistent with present observations of the cosmological structure. In the first example, the origin of structures are generated as the adiabatic perturbation during the chaotic inflation, while in the second the isocurvature non-Gaussian perturbation from the superinflating era is responsible for the structure. In the second case it is possible to generate primordial supermassive blackholes whose scale is comparable to what is expected in the galactic nuclei.