Abstract
The \(U_q(\widehat{sl}_2)\) vertex model at q = 0 with periodic boundary condition is an integrable cellular automaton in one-dimension. By the combinatorial Bethe ansatz, the initial value problem is solved for arbitrary states in terms of an ultradiscrete analogue of the Riemann theta function with rational characteristics.
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Kuniba, A., Sakamoto, R. Combinatorial Bethe Ansatz and Ultradiscrete Riemann Theta Function with Rational Characteristics. Lett Math Phys 80, 199–209 (2007). https://doi.org/10.1007/s11005-007-0162-2
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DOI: https://doi.org/10.1007/s11005-007-0162-2