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Complex hyperbolic orbifolds and hybrid lattices

机译:复双曲球体和混合晶格

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A class of complex hyperbolic lattices in PU(2, 1) called the Deligne-Mostow lattices has been reinterpreted by Hirzebruch (see Hirzebruch, in: Arithmetic and geometry, vol II, volume 36 of Progress in Mathematics, Birkhauuser, Boston, pp 113-140, 1983; Barthel et al., in: Aspects of mathematics, D4. Friedrich Vieweg Sohn, Braunschweig, 1987 and Tretkoff, in: Complex ball quotients and line arrangements in the projective plane, volume 51 of mathematical notes, Princeton University Press, Princeton, 2016) in terms of line arrangements. They use branched covers over a suitable blow up of the complete quadrilateral arrangement of lines in P-2 to construct the complex hyperbolic surfaces over the orbifolds associated to the lattices. In Pasquinelli (Conform Geom Dyn 20:235-281, 2016) and Pasquinelli (Pac J Math 302(1):201-247, 2019), fundamental domains for these lattices have been built. Here we show how the fundamental domains can be interpreted in terms of line arrangements as above. This parallel is then applied in the following context. Wells in (Geom Dedicata 208:1-11, 2020) shows that two of the Deligne-Mostow lattices in PU(2, 1) can be seen as hybrids of lattices in PU(1, 1). Here we show that he implicitly uses the line arrangement and we complete his analysis to all possible pairs of lines. In this way, we show that three more Deligne-Mostow lattices can be given as hybrids.
机译:PU(2, 1) 中的一类称为 Deligne-Mostow 晶格的复杂双曲晶格已被 Hirzebruch 重新解释(参见 Hirzebruch,载于:Arithmetic and geometry,第 II 卷,第 36 卷 Progress in Mathematics,Birkhauuser,Boston,第 113-140 页,1983 年;Barthel 等人,收录于:Aspects of mathematics, D4。Friedrich Vieweg & Sohn, Braunschweig, 1987 和 Tretkoff, in: Complex ball quotients and line arrangements in the projective plane, volume 51 of mathematical notes, Princeton University Press, Princeton, 2016) in terms of line arrangements.他们在 P-2 中完整四边形线的适当放大上使用分支覆盖物,以在与晶格相关的球体上构建复杂的双曲面。在 Pasquinelli (Conform Geom Dyn 20:235-281, 2016) 和 Pasquinelli (Pac J Math 302(1):201-247, 2019) 中,已经构建了这些晶格的基本域。在这里,我们展示了如何根据上述线排列来解释基本域。然后,在以下上下文中应用此并行。Wells in (Geom Dedicata 208:1-11, 2020) 表明,PU(2, 1) 中的两个 Deligne-Mostow 晶格可以看作是 PU(1, 1) 中晶格的混合体。在这里,我们表明他隐含地使用了线排列,并且我们完成了对所有可能的线对的分析。通过这种方式,我们证明了另外三个Deligne-Mostow晶格可以作为杂化体给出。

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