On higher genus Weierstrass sigma-function

Dmitry Korotkin; Vasilisa Shramchenko

doi:10.1016/j.physd.2012.01.002

paper

On higher genus Weierstrass sigma-function

arXiv:1201.3961 · doi:10.1016/j.physd.2012.01.002

Abstract

The goal of this paper is to propose a new way to generalize the Weierstrass sigma-function to higher genus Riemann surfaces. Our definition of the odd higher genus sigma-function is based on a generalization of the classical representation of the elliptic sigma-function via Jacobi theta-function. Namely, the odd higher genus sigma-function $σ_{χ} (u)$ (for $u\in \C^g$) is defined as a product of the theta-function with odd half-integer characteristic $β^{χ}$ , associated with a spin line bundle $χ$ , an exponent of a certain bilinear form, the determinant of a period matrix and a power of the product of all even theta-constants which are non-vanishing on a given Riemann surface. We also define an even sigma-function corresponding to an arbitrary even spin structure. Even sigma-functions are constructed as a straightforward analog of a classical formula relating even and odd sigma-functions. In higher genus the even sigma-functions are well-defined on the moduli space of Riemann surfaces outside of a subspace defined by vanishing of the corresponding even theta-constant.

to be published in Physica D

On higher genus Weierstrass sigma-function

Abstract

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