S-duality for zero-degree Vafa–Witten invariants

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Let VW^d,0m,a\hat{\mathsf{VW}}^{\mathsf m,\mathsf a}_{{\mathsf d},0} denote the zero-degree Vafa–Witten invariants and set ω=e2πi/r\omega=e^{2\pi i/{\mathsf r}}. S-duality without μ\mu-insertions. For r≥2{\mathsf r}\geq2,

VW^d,0m,a=r−2g−1∑(d′,m′,a′)ω(d,m,a)⋅(d′,m′,a′)VW^d′,0m′,a′.\hat{\mathsf{VW}}^{\mathsf m,\mathsf a}_{{\mathsf d},0}={\mathsf r}^{-2g-1}\sum_{({\mathsf d'},{\mathsf m'},{\mathsf a'})}\omega^{({\mathsf d},{\mathsf m},{\mathsf a})\cdot({\mathsf d'},{\mathsf m'},{\mathsf a'})}\hat{\mathsf{VW}}^{{\mathsf m'},{\mathsf a'}}_{{\mathsf d'},0}.

This is the zero-degree Fourier-transform form of the proposed SS-duality, stated for all ranks at least two.

References

Primary source

Denis Nesterov, “Enumerative mirror symmetry for moduli spaces of Higgs bundles and S-duality”, arXiv:2302.08379 (2023).

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