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arXiv 1202.6566hep-thmath-phmath.MP
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再论三维超对称YM-CS理论的Witten指标

Once more on the Witten index of 3d supersymmetric YM-CS theory

A. V. Smilga

摘要:

重新考虑了超对称3dYang-Mills-Chern-Simons理论中真空态的计数问题。我们解决了Witten在大体积下的原始计算和基于小体积极限下有效拉格朗日量的计算之间的争议。我们发现,后者的计算遭受的不确定性与经典真空的模空间中的奇点玻恩-奥本海默近似打破。我们还表明,这些奇异性可以准确地处理在哈密顿玻恩-奥本海默方法,其中必须仔细匹配的有效波函数的阿贝尔谷和波函数约化非阿贝尔QM理论附近的奇点。这给出了与原始Witten计算相同的结果。

英文摘要:

The problem of counting the vacuum states in the supersymmetric 3d Yang-Mills-Chern-Simons theory is reconsidered. We resolve the controversy between its original calculation by Witten at large volumes and the calculation based on the evaluation of the effective Lagrangian in the small volume limit. We show that the latter calculation suffers from uncertainties associated with the singularities in the moduli space of classical vacua where the Born-Oppenheimer approximation breaks down. We also show that these singularities can be accurately treated in the Hamiltonian Born-Oppenheimer method, where one has to match carefully the effective wave functions on the Abelian valley and the wave functions of reduced non-Abelian QM theory near the singularities. This gives the same result as original Witten's calculation.

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