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arXiv 2002.11306hep-thgr-qc
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关于含时轨道褶皱中发散的起源

On the Origin of Divergences in Time-Dependent Orbifolds

Andrea Arduino, Riccardo Finotello, Igor Pesando

摘要:

我们考虑了弦论中依赖于时间的轨道折叠,我们证明了发散与引力反作用无关,因为它们也出现在开弦扇区中。它们与基本的有效场论的不存在有关,因为在某些情况下,四阶和高阶接触项不存在。由于接触项可能来自弦质量态的交换,我们研究并证明了在开弦扇区中,某些三点振幅与一个质量态在含时轨道上是发散的。为了检查发散与具有消失体积的子空间的Laplacian的离散零特征值的存在相关联,我们构造了广义的E-Boost Orbifold,其中可以打开和关闭这种现象。

英文摘要:

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.

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