标题： 在具有负运行的温暖暴胀中对抗永恒暴胀 显示英文标题

标题： Defying eternal inflation in warm inflation with a negative running

摘要： 之前指出~\cite{Kinney:2014jya}，从（普通即冷）暴胀中曲率扰动的谱指数足够负的运行能够防止永恒暴胀的发生。 在这里，我们在温暖暴胀的背景下重新评估了这些原始结果，在温暖暴胀中，整个暴胀期间都存在由暴胀场产生的显著辐射成分。 我们证明了在普通（冷）暴胀背景下发现的相同一般条件在温暖暴胀中也成立；事实上，甚至更小的负运行就足以防止永恒暴胀。 这尤其相关，因为具有负运行的模型在温暖暴胀情景中更为普遍。 最后，在冷暴胀中永恒暴胀存在的条件——曲率扰动幅度在超视界尺度上超过单位值——在温暖暴胀的情况下变得更加严格。 曲率扰动必须更大，即在势能上更远离可观测量（例如宇宙微波背景）产生的势能部分。 显示英文摘要

摘要： It was pointed out previously~\cite{Kinney:2014jya} that a sufficiently negative running of the spectral index of curvature perturbations from (ordinary i.e. cold) inflation is able to prevent eternal inflation from ever occurring. Here, we reevaluate those original results, but in the context of warm inflation, in which a substantial radiation component (produced by the inflaton) exists throughout the inflationary period. We demonstrate that the same general requirements found in the context of ordinary (cold) inflation also hold true in warm inflation; indeed an even tinier amount of negative running is sufficient to prevent eternal inflation. This is particularly pertinent, as models featuring negative running are more generic in warm inflation scenarios. Finally, the condition for the existence of eternal inflation in cold inflation -- that the curvature perturbation amplitude exceed unity on superhorizon scales -- becomes more restrictive in the case of warm inflation. The curvature perturbations must be even larger, i.e. even farther out on the potential, away from the part of the potential where observables, e.g. in the Cosmic Microwave Background, are produced.