Weyl groups and Elliptic Solutions of the WDVV equations

TL;DR

This paper develops an elliptic ansatz for solutions to the WDVV equations using elliptic trilogarithms, explores algebraic conditions for solutions, and studies associated Frobenius manifold structures and transformation properties.

Contribution

It introduces an elliptic version of V-systems based on Weyl groups and connects elliptic solutions of the WDVV equations with Frobenius manifold structures and Jacobi group actions.

Findings

Constructed elliptic solutions using elliptic trilogarithms.

Identified algebraic conditions for elliptic V-systems.

Linked elliptic solutions to Frobenius manifold structures.

Abstract

A functional ansatz is developed which gives certain elliptic solutions of the Witten-Dijkgraaf-Verlinde-Verlinde (or WDVV) equation. This is based on the elliptic trilogarithm function introduced by Beilinson and Levin. For this to be a solution results in a number of purely algebraic conditions on the set of vectors that appear in the ansatz, this providing an elliptic version of the idea, introduced by Veselov, of a V-system. Rational and trigonometric limits are studied together with examples of elliptic V-systems based on various Weyl groups. Jacobi group orbit spaces are studied: these carry the structure of a Frobenius manifold. The corresponding almost dual structure is shown, in the A_N and B_N and conjecturally for an arbitrary Weyl group, to correspond to the elliptic solutions of the WDVV equations. Transformation properties, under the Jacobi group, of the elliptic trilogarithm are derived together with various functional identities which generalize the classical Frobenius-Stickelburger relations.