Abstract
We obtain a simple sufficient condition for the solvability of the Riemann factorization problem for matrix-valued functions on a circle. This condition is based on the symmetry principle. As an application, we consider nonlinear evolution equations that can be obtained by a unitary reduction from the zero-curvature equations connecting a linear function of the spectral parameter z and a polynomial of z. We consider solutions obtained by dressing the zero solution with a function holomorphic at infinity. We show that all such solutions are meromorphic functions on ℂ 2xt without singularities on ℝ 2xt . This class of solutions contains all generic finite-gap solutions and many rapidly decreasing solutions but is not exhausted by them. Any solution of this class, regarded as a function of x for almost every fixed t ∈ ℂ, is a potential with a convergent Baker-Akhiezer function for the corresponding matrix-valued differential operator of the first order.
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Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 144, No. 3, pp. 453–471, September, 2005.
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Domrin, A.V. The Riemann Problem and Matrix-Valued Potentials with a Convergent Baker-Akhiezer Function. Theor Math Phys 144, 1264–1278 (2005). https://doi.org/10.1007/s11232-005-0158-y
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DOI: https://doi.org/10.1007/s11232-005-0158-y