On Correspondences of a K3 Surface with itself I

Details On Correspondences of a K3 Surface with itself I On Correspondences of a K3 Surface with itself I

2003-07-27

arxiv.org/abs/math/0307355v5

On the correspondences of a K3 surface with itself. I. Tr. Mat. Inst. Steklova 246 (2004), Algebr. Geom. Metody, Svyazi i Pril

Mathematics

Algebraic Geometry

Var5: Important Sect. 5 added

Scientific paper

Let X be a K3 surface with a polarization H with H^2=2rs. Assume that H.N(X)=Z for the Picard lattice N(X). The moduli space Y of sheaves over X with the Mukai vector (r,H,s) is again a K3 surface. We prove that Y\cong X, if there exists h_1\in N(X) with (h_1)^2=f(r,s), H.h_1\equiv 0\mod g(r,s), and h_1 satisfies some condition of primitivity. Existence of such type a criterion is surprising, and also gives some geometric interpretation of elements in N(X) with negative square. We describe all 18-dimensional irreducible components of moduli of the (X,H) with Y\cong X and prove that their number is infinite. These generalizes results of math.AG/0206158, math.AG/0304415 for r=s.

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