English

Effective bounds on ampleness of cotangent bundles

Algebraic Geometry 2020-02-05 v2

Abstract

We prove that a general complete intersection of dimension nn, codimension cc and type d1,,dcd_1, \dots, d_c in PN\mathbb{P}^N has ample cotangent bundle if c2n2c \geq 2n-2 and the did_i's are all greater than a bound that is O(1)O(1) in NN and quadratic in nn. This degree bound substantially improves the currently best-known super-exponential bound in NN by Deng, although our result does not address the case nc<2n2n \leq c < 2n-2.

Keywords

Cite

@article{arxiv.1810.07666,
  title  = {Effective bounds on ampleness of cotangent bundles},
  author = {Izzet Coskun and Eric Riedl},
  journal= {arXiv preprint arXiv:1810.07666},
  year   = {2020}
}

Comments

Uses a result of Darondeau to improve the bounds