标题： 暴胀后隧穿中的超调问题 显示英文标题

标题： The Overshoot Problem in Inflation after Tunneling

摘要： 我们展示了在小尺度膨胀相比隧穿尺度较小时，如果由早期真空的Coleman-De Luccia (CDL) 隧穿转变启动，通常的参数大过冲问题将不存在。 对于低幂单项退出势$V(\phi)\sim\phi^n, n<4$，我们推导出过冲量的表达式。 这被在隧穿后穿越陡峭势垒的宽度所限制，并在达到势能的慢滚区域之前。 对于$n\geq 4$，我们证明过冲完全不存在。 我们将这一结果扩展到二项式，适用于作为级数展开的一般势能，以及暴胀子初始速度为任意有限值的情况。 这使得在通过CDL隧穿填充的弦理论真空景观中，小场和大场暴胀的初始条件相空间处于同等地位。 显示英文摘要

摘要： We show the absence of the usual parametrically large overshoot problem of small-field inflation if initiated by a Coleman-De Luccia (CDL) tunneling transition from an earlier vacuum in the limit of small inflationary scale compared to the tunneling scale. For low-power monomial exit potentials $V(\phi)\sim\phi^n, n<4$, we derive an expression for the amount of overshoot. This is bounded from above by the width of the steep barrier traversed after emerging from tunneling and before reaching a slow-roll region of the potential. For $n\geq 4$ we show that overshooting is entirely absent. We extend this result through binomials to a general potential written as a series expansion, and to the case of arbitrary finite initial speed of the inflaton. This places the phase space of initial conditions for small-field and large-field inflation on the same footing in a landscape of string theory vacua populated via CDL tunneling.