标题： 温暖多重自然暴胀 显示英文标题

标题： Warm multi natural inflation

摘要： 在温暖暴胀的背景下研究了多自然暴胀。 我们研究了具有线性和三次温度依赖耗散系数的温暖多自然暴胀情景。 该模型受到通过五维耦合与非阿贝尔规范场耦合的类轴子暴胀模型的启发，并且耗散来源于热浴中的瞬子衰变。 两种耗散系数的情况都可以与当前观测相容。 在三次耗散系数的情况下，我们发现当弱耗散到强耗散区域发生转变时，在暴胀后期阶段曲率扰动突然开始增长。 我们还表明，小尺度上曲率扰动的快速增长会导致大量由标量引起的引力波，这些引力波可能被未来的引力波探测器如DECIGO和ET检测到。 另一方面，该模型还有其他参数区域，在从弱到强耗散的温暖暴胀区域内，并且轴子衰变常数小于普朗克尺度，可能导致小尺度上原初黑洞的过量产生，这受到核合成限制，因此排除了该参数区域的模型。 显示英文摘要

摘要： Multi-natural inflation is studied in the context of warm inflation. We study the warm multi-natural inflation scenario with both linear and cubic temperature-dependent dissipation coefficients. The model is motivated by axion-like inflation models with coupling to non-Abelian gauge fields through a dimension-five coupling and dissipation originating from sphaleron decay in a thermal bath. Both cases of dissipation coefficients can be compatible with current observations. In the case of the cubic dissipation coefficient, we find that the curvature perturbation starts to grow suddenly when a transition from a weak dissipation to a strong dissipation regime occurs at the later stage of the inflation. We also show that such rapid growth of the curvature perturbation on small scales gives rise to abundant scalar induced gravitational waves, which may be detectable with future gravitational wave detectors such as DECIGO and ET. On the other hand, there are also other parameter regions of the model, in the warm inflation regime of weak to strong dissipation and with sub-Planckian axion decay constant, that can lead to overproduction of primordial black holes on small scales, which are constrained by nucleosynthesis bounds, thus ruling out the model in this region of parameters.