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arXiv 1501.02499hep-thmath-phmath.AGmath.MP
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具有Ramond穿刺的超周期矩阵

The Super Period Matrix With Ramond Punctures

Edward Witten

摘要:

我们将超黎曼曲面的超周期矩阵推广到存在Ramond穿刺的情形。对于亏格为g且具有2 r个Ramond穿孔的超Riemann曲面,我们定义了一个g| r x g|在Z_2-分次意义下对称的r周期矩阵。作为应用,我们分析了树水平上超对称四维弦论紧化中亏格2真空振幅。我们找到了一个解释的结果,已经发现在orbifold的例子中明确的计算D 'Hoker和Phong:与他们的集成程序,属2真空振幅总是消失“逐点”求和后的自旋结构,因此是完全由边界的贡献。

英文摘要:

We generalize the super period matrix of a super Riemann surface to the case that Ramond punctures are present. For a super Riemann surface of genus g with 2r Ramond punctures, we define, modulo certain choices that generalize those in the classical theory (and assuming a certain generic condition is satisfied), a g|r x g|r period matrix that is symmetric in the Z_2-graded sense. As an application, we analyze the genus 2 vacuum amplitude in string theory compactifications to four dimensions that are supersymmetric at tree level. We find an explanation for a result that has been found in orbifold examples in explicit computations by D'Hoker and Phong: with their integration procedure, the genus 2 vacuum amplitude always vanishes "pointwise" after summing over spin structures, and hence is given entirely by a boundary contribution.

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