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arXiv 0709.1805hep-th
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多重包裹D-膜配分函数的新扭场耦合

New twist field couplings from the partition function for multiply wrapped D-branes

Dario Duo, Rodolfo Russo, Stefano Sciuto

摘要:

我们考虑玻色弦论的环面紧化,特别是考虑到顶点算子、边界态和T-对偶规则的一致定义所必需的相位(上循环)。我们使用这些成分来计算的平面多回路配分函数描述磁化或相交的D-膜之间的相互作用,也在开弦模的存在。事实证明,开弦通道中的么正性关键取决于上循环的存在。然后,我们专注于2-loop的情况下,并研究退化极限,这个配分函数是直接相关的扭曲字段之间的树级3-点算子。这些分解子是计算汤川耦合和D-膜唯象模型有效作用量中其他项的主要成分。通过对2-圈配分函数进行因式分解,我们可以计算一般非因式分解环面上阿贝尔扭场的3点耦合,从而推广了以前对2-环面有效的表达式。

英文摘要:

We consider toroidal compactifications of bosonic string theory with particular regard to the phases (cocycles) necessary for a consistent definition of the vertex operators, the boundary states and the T-duality rules. We use these ingredients to compute the planar multi-loop partition function describing the interaction among magnetized or intersecting D-branes, also in presence of open string moduli. It turns out that unitarity in the open string channel crucially depends on the presence of the cocycles. We then focus on the 2-loop case and study the degeneration limit where this partition function is directly related to the tree-level 3-point correlators between twist fields. These correlators represent the main ingredient in the computation of Yukawa couplings and other terms in the effective action for D-brane phenomenological models. By factorizing the 2-loop partition function we are able to compute the 3-point couplings for abelian twist fields on generic non-factorized tori, thus generalizing previous expressions valid for the 2-torus.

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