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arXiv 1302.1045hep-th
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计数字符串,伤口和束缚

Counting Strings, Wound and Bound

Sujay K. Ashok, Suresh Nampuri, Jan Troost

摘要:

我们分析了狄拉克算子的零模计数问题,发现他们的起源在弦论的背景。第一类量子力学模型,我们计算的基态的数量产生于一个字符串缠绕的等距方向的几何形状,考虑到其能量由于张力。或者,模型产生的变形边缘束缚状态的字符串缠绕一个圆圈,并在正交几何运动。变形后,束缚态的数量再次由狄拉克算符的零模计数。我们数这些束缚态在偶数维渐近线性的双光子背景,以及在欧几里德陶伯NUT。我们在逸度中显示了多重极点行为,保持跟踪U(1)电荷。我们还讨论了第二类计数问题,当这些背景变形时,通过应用的异质对偶变换。我们讨论了我们的结果的应用Appell-Lerch和畴壁束缚态的计数。

英文摘要:

We analyze zero mode counting problems for Dirac operators that find their origin in string theory backgrounds. A first class of quantum mechanical models for which we compute the number of ground states arises from a string winding an isometric direction in a geometry, taking into account its energy due to tension. Alternatively, the models arise from deforming marginal bound states of a string winding a circle, and moving in an orthogonal geometry. After deformation, the number of bound states is again counted by the zero modes of a Dirac operator. We count these bound states in even dimensional asymptotically linear dilaton backgrounds as well as in Euclidean Taub-NUT. We show multiple pole behavior in the fugacities keeping track of a U(1) charge. We also discuss a second class of counting problems that arises when these backgrounds are deformed via the application of a heterotic duality transformation. We discuss applications of our results to Appell-Lerch sums and the counting of domain wall bound states.

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