English

Fourier-Mukai partners for very general special cubic fourfolds

Algebraic Geometry 2019-08-06 v3

Abstract

We exhibit explicit examples of very general special cubic fourfolds with discriminant dd admitting an associated (twisted) K3 surface, which have non-isomorphic Fourier-Mukai partners. In particular, in the untwisted setting, we show that the number of Fourier-Mukai partners for a very general special cubic fourfold with discriminant dd and having an associated K3 surface, is equal to the number mm of Fourier-Mukai partners of its associated K3 surface, if d2(mod6)d \equiv 2 (\text{mod}\,6); else, if d0(mod6)d \equiv 0 (\text{mod}\,6), the cubic fourfold has m/2\lceil m/2 \rceil Fourier-Mukai partners.

Keywords

Cite

@article{arxiv.1611.06687,
  title  = {Fourier-Mukai partners for very general special cubic fourfolds},
  author = {Laura Pertusi},
  journal= {arXiv preprint arXiv:1611.06687},
  year   = {2019}
}

Comments

20 pages, Final version to appear in Math. Research Letters