利用双折射和本底通量提升D-瞬子零模
Lifting D-Instanton Zero Modes by Recombination and Background Fluxes
摘要：
我们研究的条件下，D-膜瞬子在II型orientifold紧化产生一个非微扰超势。如果瞬子在orientifold作用下是非不变的，那么它携带四个而不是两个戈德斯通费米子。除非它们被提升，否则瞬子最多只能产生比斯利-威滕型的更高费米子F项。我们分析了两种策略，以解除额外的零模式。首先我们讨论了IIA型定向褶皱中的瞬张膜重组过程。我们表明，在某些情况下，收费不变性的措施强制存在进一步的零模式，不像Goldstinos，不能被吸收。在其他情况下，瞬子表现出重组后的重新参数化零模式，如果这些模式被适当的闭合或开放弦耦合提升，则会产生超势。在本文的第二部分中，我们解决解除额外的Goldstinos的D3-膜瞬子的超对称三形式的背景通量在IIB型orientifolds。这需要瞬子上的非平凡规范通量。只有当在规范通量中线性的那部分费米子作用量在东方褶皱投影中幸存下来时，额外的戈尔茨坦才能被提升。
英文摘要：
We study the conditions under which D-brane instantons in Type II orientifold compactifications generate a non-perturbative superpotential. If the instanton is non-invariant under the orientifold action, it carries four instead of the two Goldstone fermions required for superpotential contributions. Unless these are lifted, the instanton can at best generate higher fermionic F-terms of Beasley-Witten type. We analyse two strategies to lift the additional zero modes. First we discuss the process of instantonic brane recombination in Type IIA orientifolds. We show that in some cases charge invariance of the measure enforces the presence of further zero modes which, unlike the Goldstinos, cannot be absorbed. In other cases, the instanton exhibits reparameterisation zero modes after recombination and a superpotential is generated if these are lifted by suitable closed or open string couplings. In the second part of the paper we address lifting the extra Goldstinos of D3-brane instantons by supersymmetric three-form background fluxes in Type IIB orientifolds. This requires non-trivial gauge flux on the instanton. Only if the part of the fermionic action linear in the gauge flux survives the orientifold projection can the extra Goldstinos be lifted.
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