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arXiv 1006.0146hep-th
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框架BPS状态

Framed BPS States

Davide Gaiotto, Gregory W. Moore, Andrew Neitzke

摘要:

本文考虑d = 4,N = 2的超对称场论中的一类线算子,它们保持四个超对称性不破缺.这样的线算子支持一类新的BPS态,我们称之为“框架BPS态”。“这些包括类似于d = 4,N = 2超引力的晕束缚态,其中(普通)BPS粒子松散地束缚在线算子上。利用这一构造,我们给出了普通BPS粒子的Kontsevich-Soibelman过壁公式的一个新的证明,将其还原为半本原过壁公式。在S~1上约化后,线算符在IR中的维的展开为理论的模空间M上的"达布坐标"提供了一个新的物理解释。此外,我们引入了一个“保护自旋字符”,它保持跟踪的框架BPS状态的自旋自由度。我们证明了受保护的自旋特征的生成函数允许一个乘法,它定义了M上函数代数的变形。作为这些思想的一个例证,我们考虑在Riemann曲面C上紧化的六维(2,0)A1型场论。在这里,我们表明(扩展以前的结果),线运营商进行分类的某些叠层上适当的装饰版本的C,我们计算的频谱框架的BPS状态在几个明确的例子。最后,我们指出一些有趣的连接到集群代数理论。

英文摘要:

We consider a class of line operators in d=4, N=2 supersymmetric field theories which leave four supersymmetries unbroken. Such line operators support a new class of BPS states which we call "framed BPS states." These include halo bound states similar to those of d=4, N=2 supergravity, where (ordinary) BPS particles are loosely bound to the line operator. Using this construction, we give a new proof of the Kontsevich-Soibelman wall-crossing formula for the ordinary BPS particles, by reducing it to the semiprimitive wall-crossing formula. After reducing on S1, the expansion of the vevs of the line operators in the IR provides a new physical interpretation of the "Darboux coordinates" on the moduli space M of the theory. Moreover, we introduce a "protected spin character" which keeps track of the spin degrees of freedom of the framed BPS states. We show that the generating functions of protected spin characters admit a multiplication which defines a deformation of the algebra of functions on M. As an illustration of these ideas, we consider the six-dimensional (2,0) field theory of A1 type compactified on a Riemann surface C. Here we show (extending previous results) that line operators are classified by certain laminations on a suitably decorated version of C, and we compute the spectrum of framed BPS states in several explicit examples. Finally we indicate some interesting connections to the theory of cluster algebras.

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