论文标题
关于时间依赖性的Orbifolds中差异的起源
On the Origin of Divergences in Time-Dependent Orbifolds
论文作者
论文摘要
我们考虑了弦理论中时间依赖性的Orbifolds，我们表明差异与引力反应无关，因为它们也出现在开放的字符串扇区中。它们与基本有效现场理论的不存在有关，因为在某些情况下，不存在第四和更高阶段的接触术语。由于可能是由巨大状态的交换引起的，因此我们调查并表明，在开放式弦扇区中具有一个巨大状态的大约三个点幅度在时间依赖性的Orbifolds上有所不同。为了检查差异与子空间的Laplacian的离散零特征值有关，我们构建了可以打开和关闭此现象的广义无效的Orbifold。
We consider time-dependent orbifolds in String Theory and we show that divergences are not associated with a gravitational backreaction since they appear in the open string sector too. They are related to the non existence of the underlying effective field theory as in several cases fourth and higher order contact terms do not exist. Since contact terms may arise from the exchange of string massive states, we investigate and show that some three points amplitudes with one massive state in the open string sector are divergent on the time-dependent orbifolds. To check that divergences are associated with the existence of a discrete zero eigenvalue of the Laplacian of the subspace with vanishing volume, we construct the Generalized Null Boost Orbifold where this phenomenon can be turned on and off.
