标题： 可观测的暴胀衰变特征 显示英文标题

标题： Observable Signatures of Inflaton Decays

摘要： 我们数值计算了源自暴胀期间场衰减的功率谱特征。使用一个简单的、现象学的多场设定，我们将场的数量从几个增加到数千个。每当一个场衰减时，其相关的势能会被转移到辐射中，导致状态方程参数和扰动水平上的模式混合出现跃变。如果场的数量较少，我们在功率谱中观察到离散的台阶，这与文献中的解析论证一致。一旦在给定的哈勃时间内有大量场衰减，这些特征会变得越来越模糊。在这个范围内，我们验证了基于粗粒化程序的交错暴胀解析方法的有效性。我们的数值方法弥合了上述提到的解析处理，并可用于更复杂的情况。 显示英文摘要

摘要： We numerically compute features in the power-spectrum that originate from the decay of fields during inflation. Using a simple, phenomenological, multi-field setup, we increase the number of fields from a few to thousands. Whenever a field decays, its associated potential energy is transferred into radiation, causing a jump in the equation of state parameter and mode mixing at the perturbed level. We observe discrete steps in the power-spectrum if the number of fields is low, in agreement with analytic arguments in the literature. These features become increasingly smeared out once many fields decay within a given Hubble time. In this regime we confirm the validity of the analytic approach to staggered inflation, which is based on a coarse-graining procedure. Our numerical approach bridges the aforementioned analytic treatments, and can be used in more complicated scenarios.