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arXiv math-ph/0202034math-phmath.MP
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Hurwitz空间上的Tau函数

Tau-function on Hurwitz spaces

A. Kokotov, D. Korotkin

摘要:

本文在黎曼球面的分支覆盖的Hurwitz空间的连通分支上构造了一个平坦的全纯线丛。定义丛的平坦全纯联络用黎曼曲面上亚纯函数对应的分支覆盖上的不变Wirtinger射影联络来描述。在亏格0和亏格1中,我们构造了这个丛的一个无处为零的全纯水平截面(“Wirtinger τ-函数”)。在较高的亏格中,我们计算Wirtinger τ-函数的模平方。

英文摘要:

We construct a flat holomorphic line bundle over a connected component of the Hurwitz space of branched coverings of the Riemann sphere. A flat holomorphic connection defining the bundle is described in terms of the invariant Wirtinger projective connection on the branched covering corresponding to a given meromorphic function on a Riemann surface. In genera 0 and 1 we construct a nowhere vanishing holomorphic horizontal section of this bundle (the ``Wirtinger tau-function''). In higher genus we compute the modulus square of the Wirtinger tau-function.

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