Hyperkähler bases for six rational bordism theories

Published 26 Jan 2026 in math.AT | (2601.18701v1)

Abstract: We use tori and Hilbert schemes of K3 surfaces to construct explicit bases for the real, complex, and quaternionic versions of rational symplectic and rational Spin bordism. The key input to our work is a theorem of Oberdieck, Song, and Voisin on the Milnor genus of Hilbert schemes of K3s.

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