English

Non-tautological cycles on moduli spaces of smooth pointed curves

Algebraic Geometry 2024-10-08 v1

Abstract

In recent work by Arena, Canning, Clader, Haburcak, Li, Mok, and Tamborini it was proven that for infinitely many values of gg and nn, there exist non-tautological algebraic cohomology classes on the moduli space Mg,n\mathcal{M}_{g,n} of smooth genus gg, nn-pointed curves. Here we show how a generalization of their technique allows to cover most of the remaining cases, proving the existence of non-tautological algebraic cohomology classes on the moduli space Mg,n\mathcal{M}_{g,n} for all but finitely many values of gg and nn.

Keywords

Cite

@article{arxiv.2410.04400,
  title  = {Non-tautological cycles on moduli spaces of smooth pointed curves},
  author = {Dario Faro and Carolina Tamborini},
  journal= {arXiv preprint arXiv:2410.04400},
  year   = {2024}
}