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arXiv 0811.3322hep-th
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R-R 3-形式背景下的瞬子计算与变形N=2超杨-米尔斯理论

Instanton Calculus in R-R 3-form Background and Deformed N=2 Super Yang-Mills Theory

Katsushi Ito, Hiroaki Nakajima, Shin Sasaki

摘要:

研究了IIB型超弦中N=2超对称Yang-Mills理论在常数Ramond-Ramond(R-R)3-形式场强背景下形变瞬子的ADHM结构.在相同的R-R背景下,我们比较了变形瞬子的有效作用量与分数阶D3/D(-1)膜在C^2/Z_2的轨道奇点处的有效作用量。我们发现它们之间在二阶形变参数上的差异,这是由于D(-1)-膜的平移零模与R-R背景的耦合。我们通过增加一个时空相关的规范耦合项来改进变形作用量。虽然时空作用量与Ω背景中的作用量不同,但在规范耦合中,这两种作用量在最低阶导致相同的瞬子运动方程。

英文摘要:

We study the ADHM construction of instantons in N=2 supersymmetric Yang-Mills theory deformed in constant Ramond-Ramond (R-R) 3-form field strength background in type IIB superstrings. We compare the deformed instanton effective action with the effective action of fractional D3/D(-1) branes at the orbifold singularity of C^2/Z_2 in the same R-R background. We find discrepancy between them at the second order in deformation parameters, which comes from the coupling of the translational zero modes of the D(-1)-branes to the R-R background. We improve the deformed action by adding a term with space-time dependent gauge coupling. Although the space-time action differs from the action in the omega-background, both actions lead to the same instanton equations of motion at the lowest order in gauge coupling.

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