English

A hyperbolicity conjecture for adjoint bundles

Algebraic Geometry 2025-05-05 v2

Abstract

Let XX be a nn-dimensional smooth projective variety and LL be an ample Cartier divisor on XX. We conjecture that a very general element of the linear system KX+(3n+1)L|K_X+(3n+1)L| is a hyperbolic algebraic variety. This conjecture holds for some classical varieties: surfaces, products of projective spaces, and Grassmannians. In this article, we investigate the conjecture for XX a toric variety. We confirm the conjecture in the case of smooth projective toric varieties. When XX is a Gorenstein toric variety, we show that KX+(3n+1)L|K_X+(3n+1)L| is pseudo hyperbolic. For a Gorenstein toric threefold XX, we show that KX+9L|K_X+9L| is hyperbolic.

Keywords

Cite

@article{arxiv.2412.01811,
  title  = {A hyperbolicity conjecture for adjoint bundles},
  author = {Joaquín Moraga and Wern Yeong},
  journal= {arXiv preprint arXiv:2412.01811},
  year   = {2025}
}

Comments

15 pages, comments welcome. v2: Corrected a gap in proof of main theorems from previous draft (statements unchanged), added results about pseudo hyperbolicity on Gorenstein toric varieties

R2 v1 2026-06-28T20:20:15.577Z