Theta Characteristics of Tropical K 4 -Curves

Theta Characteristics of Tropical K 4 -Curves
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热带 K 4 曲线的 Theta 特征

DOI:
10.1007/978-1-4939-7486-3_4
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发表时间:
2015
期刊:
arXiv: Algebraic Geometry
影响因子:
--
通讯作者:
Pakawut Jiradilok
Pakawut Jiradilok
中科院分区:
--
文献类型:
--
作者:
M. Chan;Pakawut Jiradilok

文献摘要

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K4 曲线是具有估值的域上的属 3 的平滑真曲线 X,其 Berkovich 骨架 Γ 是四个顶点上的完全图。曲线 X 具有 28 个有效 theta 特征(规范嵌入的 28 个双切线),而 Γ 恰好具有 7 个有效热带 theta 特征,如 Zharkov 所示。我们证明了 K4 曲线的 28 个有效 θ 特征专门针对其最小骨架的 θ 特征,分为七组,每组四个。
A K4-curve is a smooth proper curve X of genus 3 over a field with valuation whose Berkovich skeleton Γ is a complete graph on four vertices. The curve X has 28 effective theta characteristics—the 28 bitangents to a canonical embedding—while Γ has exactly seven effective tropical theta characteristics, as shown by Zharkov. We prove that the 28 effective theta characteristics of a K4-curve specialize to the theta characteristics of its minimal skeleton in seven groups of four.