$\overline{\mathcal{R}}_{g,2}$的双有理几何与Pryn-典型分界层
The birational geometry of $\overline{\mathcal{R}}_{g,2}$ and Prym-canonical divisorial strata
摘要：
证明了在两点分歧的双覆盖的模空间$\mathcal{R}_{g,2}$对$3\leq g\leq 6$是正则的，对$g\geq 16$是一般型的.此外，我们考虑了模空间$\overline{\mathcal{C}^n\mathcal{R}}_g$中参数化$n$ -pointed Prym曲线的Prym-标准划分层，并在$\mathrm{Pic}_\mathbb{Q}(\overline{\mathcal{C}^n\mathcal{R}}_g)$中计算了它们的类。
英文摘要：
We prove that the moduli space of double covers ramified at two points $\mathcal{R}_{g,2}$ is uniruled for $3\leq g\leq 6$ and of general type for $g\geq 16$. Furthermore, we consider Prym-canonical divisorial strata in the moduli space $\overline{\mathcal{C}^n\mathcal{R}}_g$ parametrizing $n$-pointed Prym curves, and we compute their classes in $\mathrm{Pic}_\mathbb{Q}(\overline{\mathcal{C}^n\mathcal{R}}_g)$.
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