通过SPT相位的GSO投影
GSO projections via SPT phases
摘要：
我们指出，GSO预测中的相位选择可以通过选择弦的世界面上的费米子SPT相位来解释。这一观点不仅很容易解释为什么本质上存在两个II型理论，而且还预言存在由n mod 8标记的无定向的0型理论，并且存在I型世界面理论的本质上唯一的选择。我们还讨论了这个观点与D-膜的K-理论分类之间的关系。
英文摘要：
We point out that the choice of phases in GSO projections can be accounted for by a choice of fermionic SPT phases on the worldsheet of the string. This point of view not only easily explains why there are essentially two type II theories, but also predicts that there are unoriented type 0 theories labeled by n mod 8, and that there is an essentially unique choice of the type I worldsheet theory. We also discuss the relationship between this point of view and the K-theoretic classification of D-branes.
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