Towards a modular construction of OG10

Abstract

We construct the first example of a stable hyperholomorphic vector bundle of rank five on every hyper-Kähler manifold of ${K3}^{[2]}$-type whose deformation space is smooth of dimension ten. Its moduli space is birational to a hyper-Kähler manifold of type OG10. This provides evidence for the expectation that moduli spaces of sheaves on a hyper-Kähler could lead to new examples of hyper-Kähler manifolds.

36 pages. Final version, to appear in Compositio Mathematica