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arXiv 1202.0782math.DG
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Riemann surface的雅可比矩阵和简单闭测地线割迹的几何形状

The Jacobian of a Riemann surface and the geometry of the cut locus of simple closed geodesics

Bjoern Muetzel

摘要:

对于亏格为g的任何紧致黎曼曲面,人们可以指定一个维数为g的主极化阿贝尔簇,即黎曼曲面的雅可比矩阵。雅可比矩阵是一个复环面,雅可比矩阵的格的格矩阵称为周期格矩阵。本文给出了周期Gram矩阵关于适当的同调基的所有元素的上界和下界。这些界限依赖于非分离简单闭测地线的割迹的几何形状。假设切割轨迹可以计算,提出了一种理论方法,然后给出了一个例子,其中的上界是尖锐的。最后,我们给出了实际的估计的基础上的Fenchel-Nielsen坐标的表面的签名(1,1),或Q-片。这里开发的方法已被应用到表面,包含小的非分离简单的闭测地线在[BMMS]。

英文摘要:

To any compact Riemann surface of genus g one may assign a principally polarized abelian variety of dimension g, the Jacobian of the Riemann surface. The Jacobian is a complex torus, and a Gram matrix of the lattice of a Jacobian is called a period Gram matrix. This paper provides upper and lower bounds for all the entries of the period Gram matrix with respect to a suitable homology basis. These bounds depend on the geometry of the cut locus of non-separating simple closed geodesics. Assuming that the cut loci can be calculated, a theoretical approach is presented followed by an example where the upper bound is sharp. Finally we give practical estimates based on the Fenchel-Nielsen coordinates of surfaces of signature (1,1), or Q-pieces. The methods developed here have been applied to surfaces that contain small non-separating simple closed geodesics in [BMMS].

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