Spaces of boundary values related to a multipoint version of the KP-hierarchy

G.F. Helminck

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    In this paper one considers a finite number of points in the complex plane and various spaces of boundary values on circles surrounding these points. To this geometric configuration one associates a Grassmann manifolds that is shown to yield solutions of a multipoint version of the linearization of the $KP$-hierarchy. These Grassmann manifolds are built in such a way that the determinant line bundle and its dual over them still make sense. The same holds for the so-called $\tau$-functions, determinants of certain Fredholm operators that measure the failure of equivariance at lifting the commuting flows of ths hierarchy to these bundles. Solutions of the linearization are described by wave functions of a certain type. They are perturbations of the trivial solution with the leading term of the perturbation determining the type. One concludes with showing that, if a plane in the Grassmann manifold yields wave functions of different types, they are connected by a differential operator in the coordinates of the flows.
    Original languageUndefined
    Place of PublicationEnschede
    PublisherUniversity of Twente
    Number of pages16
    Publication statusPublished - 2004

    Publication series

    PublisherUniversity of Twente, Department of Applied Mathematics
    ISSN (Print)0169-2690


    • MSC-22E70
    • MSC-58B25
    • IR-65928
    • MSC-35Q58
    • MSC-22E65
    • METIS-227110
    • EWI-3564

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