Abstract:
We study algebro-geometric (finite-gap) and elliptic solutions of fully discretized KP or 2D Toda equations. In bilinear form they are Hirota's difference equation for τ-functions. Starting from a given algebraic curve, we express the τ-function and the Baker–Akhiezer function in terms of the Riemann theta function. We show that the elliptic solutions, when the τ-function is an elliptic polynomial, form a subclass of the general algebro-geometric solutions. We construct the algebraic curves of the elliptic solutions. The evolution of zeros of the elliptic solutions is governed by the discrete time generalization of the Ruijsenaars-Schneider many body system. The zeros obey equations which have the form of nested Bethe-ansatz equations, known from integrable quantum field theories. We discuss the Lax representation and the action-angle-type variables for the many body system. We also discuss elliptic solutions to discrete analogues of KdV, sine-Gordon and 1D Toda equations and describe the loci of the zeros.
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Received: 15 May 1997 / Accepted: 7 September 1997
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Krichever, I., Wiegmann, P. & Zabrodin, A. Elliptic Solutions to Difference Non-Linear Equations and Related Many-Body Problems . Comm Math Phys 193, 373–396 (1998). https://doi.org/10.1007/s002200050333
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DOI: https://doi.org/10.1007/s002200050333