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arXiv 0811.2155hep-th
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磁单极子的超对称量子力学:一个实例研究

Supersymmetric Quantum Mechanics of Magnetic Monopoles: A Case Study

Erik Jan de Vries, Bernd J. Schroers

摘要:

详细研究了规范群SU(3)自发破缺为U(1)× U(1)的N=2超对称Yang-Mills-Higgs理论中荷(1,1)磁单极子的超对称量子力学.我们使用量子化动力学的模空间近似,它可以用两种等价的形式表示:一种是在模空间上用狄拉克旋量描述量子态,在这种情况下,哈密顿量是狄拉克算子的平方;另一种是在模空间上用反全纯形式描述量子态,在这种情况下,哈密顿量是作用于形式的拉普拉斯算子。我们回顾这两种形式主义的推导,明确展示其等价性,并推导出一般表达式的超荷微分算子在这两种形式主义。我们提出了总角动量算符作为微分算符的一般表达式,并检验了它与超荷的对易关系。利用已知的荷(1,1)磁单极子的模空间的度规结构,我们证明了在模空间近似下,这种磁单极子不存在量子束缚态。我们展示了散射态,并计算了相应的微分截面。

英文摘要:

We study, in detail, the supersymmetric quantum mechanics of charge-(1,1) monopoles in N=2 supersymmetric Yang-Mills-Higgs theory with gauge group SU(3) spontaneously broken to U(1) x U(1). We use the moduli space approximation of the quantised dynamics, which can be expressed in two equivalent formalisms: either one describes quantum states by Dirac spinors on the moduli space, in which case the Hamiltonian is the square of the Dirac operator, or one works with anti-holomorphic forms on the moduli space, in which case the Hamiltonian is the Laplacian acting on forms. We review the derivation of both formalisms, explicitly exhibit their equivalence and derive general expressions for the supercharges as differential operators in both formalisms. We propose a general expression for the total angular momentum operator as a differential operator, and check its commutation relations with the supercharges. Using the known metric structure of the moduli space of charge-(1,1) monopoles we show that there are no quantum bound states of such monopoles in the moduli space approximation. We exhibit scattering states and compute corresponding differential cross sections.

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