An Extended Abel-Jacobi Map

Abstract

We solve the problem of inversion of an extended Abel-Jacobi map $$ \int_{P_{0}}^{P_{1}}ω+...+\int_{P_{0}}^{P_{g+n-1}}ω={\bf z}, \qquad \int_{P_{0}}^{P_{1}}Ω_{j1}+... +\int_{P_{0}}^{P_{g+n-1}}Ω_{j1} =Z_{j},\quad j=2,...,n, $$ where $Ω_{j1}$ are (normalised) abelian differentials of the third kind. In contrast to the extensions already studied, this one contains meromorphic differentials having a common pole $Q_1$. This inversion problem arises in algebraic geometric description of monopoles, as well as in the linearization of integrable systems on finite-dimensional unreduced coadjoint orbits on loop algebras.