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arXiv 1302.6993hep-th
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精化拓扑弦的Worldsheet实现

Worldsheet Realization of the Refined Topological String

I. Antoniadis, I. Florakis, S. Hohenegger, K. S. Narain, A. Zein Assi

摘要:

在有效超引力作用量下,用物理弦振幅计算形式为F_{g,n} W^{2g}Y^{2n}的广义N=2 F项,提出了精细拓扑弦的世界表实现.这些术语涉及手征外尔超场W和超场Y,其被定义为特定反手征T-杆矢量多重态的N=2手征投影。在杂合理论和I型理论中,在六维流形K3 xT 2上紧化后得到,T是T2环面的通常凯勒模。这些振幅是在弦论中的单圈水平上精确计算的。当在弦模空间的SU(2)增强点周围展开时,它们在场论极限中再现了Nekrasov配分函数的正确微扰部分。然后,分别用T-bar矢量多重态的反自对偶引力光子和自对偶规范场的常场强背景,确定了Ω超引力背景的两个形变参数φ_-和φ_+。

英文摘要:

A worldsheet realization of the refined topological string is proposed in terms of physical string amplitudes that compute generalized N=2 F-terms of the form F_{g,n} W^{2g}Y^{2n} in the effective supergravity action. These terms involve the chiral Weyl superfield W and a superfield Y defined as an N=2 chiral projection of a particular anti-chiral T-bar vector multiplet. In Heterotic and Type I theories, obtained upon compactification on the six-dimensional manifold K3xT2, T is the usual Kähler modulus of the T2 torus. These amplitudes are computed exactly at the one-loop level in string theory. They are shown to reproduce the correct perturbative part of the Nekrasov partition function in the field theory limit when expanded around an SU(2) enhancement point of the string moduli space. The two deformation parameters epsilon_- and epsilon_+ of the Omega-supergravity background are then identified with the constant field-strength backgrounds for the anti-self-dual graviphoton and self-dual gauge field of the T-bar vector multiplet, respectively.

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