Multisoliton solutions to the lattice Boussinesq equation

Details Multisoliton solutions to the lattice Boussinesq equation Multisoliton solutions to the lattice Boussinesq equation

2009-06-22

arxiv.org/abs/0906.3955v1

J. Math. Phys. 51, 033505 (2010)

Nonlinear Sciences

Exactly Solvable and Integrable Systems

12 pages

Scientific paper

10.1063/1.3280362

The lattice Boussinesq equation (BSQ) is a three-component difference-difference equation defined on an elementary square of the 2D lattice, having 3D consistency. We write the equations in the Hirota bilinear form and construct their multisoliton solutions in terms of Casoratians, following the methodology in our previous papers. In the construction it turns out that instead of the usual discretization of the exponential as $[(a+k)/(a-k)]^n$ we need two different terms $[(a-\omega k)/(a-k)]^n$ and $[(a-\omega^2 k)/(a-k)]^n$, where $\omega$ is a cubic root of unity $\neq 1$.

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