English

Components of moduli spaces of spin curves with the expected codimension II

Algebraic Geometry 2018-07-17 v3

Abstract

We prove that for all integers r2r \geq 2 and gr2+10r+14g \geq \lfloor \frac{r^2+10r+1}{4} \rfloor there exists a component of the locus Sgr\mathcal{S}^r_g of spin curves with a theta characteristic LL such that h0(L)r+1h^0(L) \geq r+1 and h0(L)r+1(mod2)h^0(L)\equiv r+1 (\text{mod} 2) which has expected codimension (r+12)\binom{r+1}{2} inside the moduli space Sg\mathcal{S}_g of spin curves of genus gg.

Keywords

Cite

@article{arxiv.1502.05262,
  title  = {Components of moduli spaces of spin curves with the expected codimension II},
  author = {Luca Benzo},
  journal= {arXiv preprint arXiv:1502.05262},
  year   = {2018}
}

Comments

Completely revised version. Lemma 2.10 has been corrected. The flow of the main argument has been remarkably simplified, Proposition 2.16 and Lemma 3.5 have been strengthened accordingly. The final part of the previous version concerning Gaussian maps on general curves has been split off and will be the object of a forthcoming paper