Abstract
This paper is devoted to the theory of WDVV equations of associativity. This remarkable system of nonlinear differential equations was discovered by E. Witten [85]and R. Dijkgraaf, E. Verlinde, and H. Verlinde [24]in the beginning of the 1990s. It was first derived as equations for the so-called primary free energy of a family of two-dimensional topological field theories. Later it proved to be an efficient tool in the solution of problems of the theory of Gromov-Witten invariants, reflection groups and singularities, and integrable hierarchies.
Here we mainly consider the relationships of WDVV to the theory of Pain-levé equations. This is a two-way connection. First, any solution to WDVV satisfying certain semisimplicity conditions can be expressed via Painle-vé-type transcendents. Conversely, theory of WDVV works as a source of remarkable particular solutions of the Painlevé equations.
This chapter is an extended version of the lecture notes of a course given at the 1996 Cargèse summer school, “The Painlevé Property: One Century Later.” It is organized as follows.
In Section 1 we give a sketch of the ideas of two-dimensional topological field theory, we formulate WDVV, and give the main examples of solutions coming from quantum cohomology and from singularity theory. In Section 2 we give a coordinate-free reformulation of WDVV introducing the notion of a Frobenius manifold. We also construct the first main geometrical object, namely the deformed affine connection on a Frobenius manifold. The monodromy of the deformed connection at the origin gives us the first set of important invariants of Frobenius manifolds. In Section 3 we define the class of semisimple Frobenius manifolds. In physics these correspond to two-dimensional topological field theories with all relevant perturbations. We construct the so-called canonical coordinates on such manifolds. In Section 4 we complete the classification of semisimple Frobenius manifolds in terms of monodromy data of a certain universal linear differential operator with rational coefficients. We give a nontrivial example of computation of the monodromy data in quantum cohomology. In the last section we develop a “mirror construction” representing the principal geometrical objects on a semisimple Frobenius manifold by residues and oscillatory integrals of a family of analytic functions on Riemann surfaces.
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Dubrovin, B. (1999). Painlevé Transcendents in Two-Dimensional Topological Field Theory. In: Conte, R. (eds) The Painlevé Property. CRM Series in Mathematical Physics. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-1532-5_6
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