A conjectural bound on the second Betti number for hyper-Kähler manifolds

Yoon-Joo Kim, Radu Laza

Published 2019-09-16Version 1

In previous work, we noted that the known cases of hyper-K\"ahler manifolds satisfy a natural condition on the LLV decomposition of the cohomology; informally, the Verbitsky component is the dominant representation in the LLV decomposition. Assuming this condition holds for all hyper-K\"ahler manifolds, we obtain an upper bound for the second Betti number in terms of the dimension.