Abstract
A new approach to the construction of isomonodromy deformations of 2× 2 Fuchsian systems is presented. The method is based on a combination of the algebro-geometric scheme and Riemann–Hilbert approach of the theory of integrable systems. For a given number 2g+ 1, g≥ 1, of finite (regular) singularities, the method produces a 2g-parameter submanifold of the Fuchsian monodromy data for which the relevant Riemann–Hilbert problem can be solved in closed form via the Baker–Akhiezer function technique. This in turn leads to a 2g-parameter family of solutions of the corresponding Schlesinger equations, explicitly described in terms of Riemann theta functions of genus g. In the case g= 1 the solution found coincides with the general elliptic solution of the particular case of the Painleve VI equation first obtained by N. J. Hitchin [H1].
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