Nonlinear Sciences – Exactly Solvable and Integrable Systems

Scientific paper

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2012-01-19

Nonlinear Sciences

Exactly Solvable and Integrable Systems

to be published in Physica D

Scientific paper

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 $\sigma_{\chi}(u)$ (for $u\in \C^g$) is defined as a product of the theta-function with odd half-integer characteristic $\beta^{\chi}$, associated with a spin line bundle $\chi$, 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.

**Korotkin Dmitry**

Nonlinear Sciences – Exactly Solvable and Integrable Systems

Scientist

**Shramchenko Vasilisa**

Physics – Mathematical Physics

Scientist

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