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N-Wave Equations with Orthogonal Algebras: Z_2 and Z_2 imes Z_2 Reductions and Soliton Solutions | | Vladimir S. Gerdjikov
; Nikolay A. Kostov
; Tihomir I. Valchev
; | | Date: |
3 Mar 2007 | | Journal: | SIGMA 3 (2007), 039, 19 pages | | Subject: | Exactly Solvable and Integrable Systems | | Abstract: | We consider $N$-wave type equations related to the orthogonal algebras obtained from the generic ones via additional reductions. The first $mathbb{Z}_2$-reduction is the canonical one. We impose a second $mathbb{Z}_2$-reduction and consider also the combined action of both reductions. For all three types of $N$-wave equations we construct the soliton solutions by appropriately modifying the Zakharov-Shabat dressing method. We also briefly discuss the different types of one-soliton solutions. Especially rich are the types of one-soliton solutions in the case when both reductions are applied. This is due to the fact that we have two different configurations of eigenvalues for the Lax operator $L$: doublets, which consist of pairs of purely imaginary eigenvalues, and quadruplets. Such situation is analogous to the one encountered in the sine-Gordon case, which allows two types of solitons: kinks and breathers. A new physical system, describing Stokes-anti Stokes Raman scattering is obtained. It is represented by a 4-wave equation related to the ${f B}_2$ algebra with a canonical $mathbb{Z}_2$ reduction. | | Source: | arXiv, nlin/0703002 | | Services: | Forum | Review | PDF | Favorites | |
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