Abstract
We construct new exact solutions for the high-order discrete mKdV (dmKdV) equation. The exact solutions are obtained by using the nonlinearization of spectral problem, one-, and two-fold Darboux transformations. Two families of traveling periodic waves of the high-order dmKdV equation are expressed by the Jacobi dnoidal and cnoidal elliptic functions. Since the dnoidal traveling wave is modulationally stable and the traveling cnoidal wave is modulationally unstable, the rogue waves only generated on the cnoidal wave background while the algebraic solitons propagating on the dnoidal wave background.
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Appendix A.
Appendix A.
Using the formula for addition of Jacobi elliptic function
substituting (27) into (24), we reach
Then, we can obtain
Substituting (28) into the above equation and using \(cn^2(\alpha ,k)=1-sn^2(\alpha ,k),dn^2(\alpha ,k)=1-k^2sn^2(\alpha ,k)\), we have
Collecting the coefficients of \(dn(\xi ,k)\), \(sn^2(\xi ,k)dn(\xi ,k)\), \(sn^4(\xi ,k)dn(\xi ,k)\), \(sn(\xi ,k)cn(\xi ,k)\), \(sn^3(\xi ,k)cn(\xi ,k)\) and \(sn^5(\xi ,k)cn(\xi ,k)\) yield the system of equations
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Zhen, Y., Chen, J. Rogue waves on the periodic background in the high-order discrete mKdV equation. Nonlinear Dyn 111, 12511–12524 (2023). https://doi.org/10.1007/s11071-023-08481-z
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DOI: https://doi.org/10.1007/s11071-023-08481-z