Twisted 6d $(2,0)$ SCFTs on a Circle

Abstract

We study twisted circle compactification of 6d $(2,0)$ SCFTs to 5d $\mathcal{N}=2$ supersymmetric gauge theories with non-simply-laced gauge groups. We provide two complementary approaches towards the BPS partition functions, reflecting the 5d and 6d point of view respectively. The first is based on the blowup equations for the instanton partition function, from which in particular we determine explicitly the one-instanton contribution for all simple Lie groups. The second is based on the modular bootstrap program, and we propose a novel modular ansatz for the twisted elliptic genera that transform under the congruence subgroups ${\Gamma }_0(N)$ of $\text{SL}(2,\mathbb{Z})$. We conjecture a vanishing bound for the refined Gopakumar-Vafa invariants of the genus one fibered Calabi-Yau threefolds, upon which one can determine the twisted elliptic genera recursively. We use our results to obtain the 6d Cardy formulas and find universal behaviour for all simple Lie groups. In addition, the Cardy formulas remain invariant under the twist once the normalization of the compact circle is taken into account.

arXiv comment42+20 pages, 15 tables, v2: minor corrections, published version

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Cited by in corpus (4)

• Black Hole Entropy from Quantum Mechanics
• Modular curves, the Tate-Shafarevich group and Gopakumar-Vafa invariants with discrete charges
• Topological strings and Wilson loops
• Affine characters at negative level and elliptic genera of non-critical strings