标题： inflation场的超级普朗克 excursion 和量子修正 显示英文标题

标题： Super-Planckian excursions of the inflaton and quantum corrections

摘要： 具有超Planck尺度游走的膨胀模型似乎与BICEP2数据观测到的宇宙微波背景（CMB）辐射中的B模式极化近期观测结果非常一致。 在这篇短文中，我们将强调这些模型从紫外（UV）完备性角度面临的挑战。 特别是，我们将讨论膨胀子拉格朗日和引力部门的辐射修正。 我们将强调为什么我们需要一个UV完备的引力理论来解决一些关于超Planck尺度游走的问题。 特别是，我们将突出展示如果逐阶考虑，膨胀子和引力部门中的高阶导数项如何因非定域性和鬼场问题而引起麻烦，并因此促使我们考虑无限系列这样的项。 我们还将强调，在Planck尺度以下存在新的物理标度将使一些与UV相关的难题更加紧迫，并且会使得文献中提出的一些补救措施失效。 最后，我们将简要推测可能解决这些挑战的方法。 显示英文摘要

摘要： Models of inflation with super-Planckian excursion seem well in agreement with the recent observations of B- mode polarization in the cosmic microwave background (CMB) radiation by the BICEP2 data. In this note, we highlight the challenges faced by such models from ultraviolet (UV) completion. In particular, we will discus radiative corrections to the inflaton Lagrangian and to the gravitational sector. We will emphasize why we would require an UV complete theory of gravity to tackle some of the issues for the super-Planckian excursion. In particular, we will highlight how higher derivative terms in the inflaton and gravity sectors cause problems from non-locality and ghosts, if considered order by order, and thus prompt us to take into account infinite series of such terms. We will also stress how the presence of a scale of new physics below the Planck scale would make some of the UV related problems more compelling and invalidate some of the remedies that have been proposed in the literature. Finally, we will briefly speculate on possible ways of curing some of the challenges.