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An MBM locus on a hyperkahler manifold is the union of all deformations of aminimal rational curve with negative self-intersection. MBM loci can beequivalently defined as centers of bimeromorphic contractions. It was shownthat the MBM loci on deformation equivalent hyperkahler manifolds arediffeomorphic. We determine the MBM loci on a hyperkahler manifold of K3-typeof low dimension using a deformation to a Hilbert scheme of a non-algebraic K3surface.

MBM classes and contraction loci on low-dimensional hyperkahler manifolds of K3 type