The authors rigorously build local hyper-Kähler model geometries, generalizing Ooguri-Vafa and multi-Ooguri-Vafa examples, from the Gaiotto-Moore-Neitzke Riemann-Hilbert formalism.
A plethora of K3 metrics
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abstract
We extend our recent study of K3 metrics near the $T^4/Z_2$ orbifold locus to the other torus orbifold loci. In particular, we provide several new constructions of K3 surfaces as hyper-K\"ahler quotients, which yield new formulae for K3 metrics. We then relate these to the construction of arXiv:1810.10540. As a corollary, we derive infinitely many constraints on the (as yet unknown) BPS spectra of the Minahan-Nemeschansky SCFTs with $E_n$ global symmetry. Specifically, we find linear combinations of $E_n$ characters (evaluated at different points) hiding within K3 metrics and we compute their second order Taylor expansions. We also find novel strong relationships between the BPS spectra of these SCFTs, as well as with that of the $SU(2)$ $N_f = 4$ SCFT. Finally, we provide a new derivation of the class S constructions of these SCFTs and state some experimental observations regarding their BPS spectra.
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math.DG 1years
2025 1verdicts
CONDITIONAL 1representative citing papers
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Hyper-K\"ahler manifolds from Riemann-Hilbert problems I: Ooguri-Vafa-like model geometries
The authors rigorously build local hyper-Kähler model geometries, generalizing Ooguri-Vafa and multi-Ooguri-Vafa examples, from the Gaiotto-Moore-Neitzke Riemann-Hilbert formalism.