Curvature and characteristic numbers of hyper-Kähler manifolds

Abstract

Characteristic numbers of compact hyper-Kahler manifolds are expressed in graph-theoretical form, considering them as a special case of the curvature invariants introduced by L. Rozansky and E. Witten. The appropriate graphs are generated by wheels, and the recently proved Wheeling theorem is used to give a formula for the $\mathscr{L}$2-norm of the curvature of an irreducible hyper-Kahler manifold in terms of the volume and Pontryagin numbers. The formula involves the multiplicative sequence that is the square root of the Â-polynomial.