Strong Donagi–Morrison conjecture for Lazarsfeld–Mukai bundles

Let (S,H)(S,H) be a polarized K3 surface of genus gg, let CHC\in|H| be a smooth irreducible curve, and let AA be a complete basepoint-free gdrg^r_d on CC with r2r\geq 2 and ρ(g,r,d)<0\rho(g,r,d)<0. Let EC,AE_{C,A} denote the associated Lazarsfeld–Mukai bundle.

Strong Donagi–Morrison conjecture. There is a nontrivial line bundle NEC,AN\hookrightarrow E_{C,A} with h0(S,N)2h^0(S,N)\geq 2 such that EC,A/NE_{C,A}/N is stable.

This stronger formulation would produce the line bundles used in known lifting arguments by requiring a stable quotient of the Lazarsfeld–Mukai bundle. The source states that the conjecture is false, with counterexamples cited in the literature.

Sources & referencesView supporting material

Primary source

Richard Haburcak, “Curves on Brill-Noether special K3 surfaces”, arXiv:2306.11664 (2023).

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