Boundness of b2 for hyperk\"ahler manifolds with vanishing odd-Betti numbers

Abstract

We prove that b2 is bounded for hyperk\"ahler manifolds with vanishing odd-Betti numbers. The explicit upper boundary is conjectured. Following the method described by Sawon we prove that b2 is bounded in dimension eight and ten in the case of vanishing odd-Betti numbers by 24 and 25 respectively.

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