Integrable Structure of the Dirichlet Boundary Problem in Multiply-Connected Domains
Igor Moiseevich Krichever, Andrei Vladimirovich Marshakov, Anton Vladimirovich Zabrodin, O Zabornosky · CERN Document Server (European Organization for Nuclear Research) · 2003
We study the integrable structure of the Dirichlet boundary problem in two dimensions and extend the approach to the case of planar multiply-connected domains. The solution to the Dirichlet boundary problem in multiply-connected case is given through a quasiclassical tau-function, which generalizes the tau-function of the dispersionless Toda hierarchy. It is shown to obey an infinite hierarchy of Hirota-like equations which directly follow from properties of the Dirichlet Green function and from the Fay identities. The relation to multi-support solutions of matrix models is briefly discussed.