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arXiv 1902.08586hep-thmath-phmath.MP
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量子线缺陷与精细BPS谱

Quantum Line Defects and Refined BPS Spectra

Michele Cirafici

摘要:

本文研究了$\mathcal{S}$类量子场论中与某些量子线缺陷相关的精化BPS不变量。通过在特定曲线上指定路径,可以在UV中通过几何工程指定此类缺陷。在IR中,它们被描述为框架BPS颤动。我们研究了相关的BPS谱问题,包括自旋内容。相关的BPS不变量产生于K理论的计数几何的模空间的代数表示,适应建设由Nekrasov和Okounkov。特别是细化帧BPS状态描述通过欧拉特性的某些复杂的层。

英文摘要:

In this note we study refined BPS invariants associated with certain quantum line defects in quantum field theories of class $\mathcal{S}$. Such defects can be specified via geometric engineering in the UV by assigning a path on a certain curve. In the IR they are described by framed BPS quivers. We study the associated BPS spectral problem, including the spin content. The relevant BPS invariants arise from the K-theoretic enumerative geometry of the moduli spaces of quiver representations, adapting a construction by Nekrasov and Okounkov. In particular refined framed BPS states are described via Euler characteristics of certain complexes of sheaves.

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