摘要 : We define a class of supersymmetric defect loop operators in \( \mathcal{N} \) = 2 gauge theories in 2 + 1 dimensions. We give a prescription for computing the expectation value of such operators in a generic \( \mathcal{N} \) = 2... 展开 We define a class of supersymmetric defect loop operators in \( \mathcal{N} \) = 2 gauge theories in 2 + 1 dimensions. We give a prescription for computing the expectation value of such operators in a generic \( \mathcal{N} \) = 2 theory on the three-sphere using localization. We elucidate the role of defect loop operators in IR dualities of supersymmetric gauge theories, and write down their transformation properties under the SL(2, \( \mathbb{Z} \)) action on conformal theories with abelian global symmetries. 收起