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Existence of traveling-wave solutions to Boussinesq systems. (English) Zbl 1249.35286
Summary: In this manuscript the existence of traveling-wave solutions to Boussinesq systems $$\eta _t+u_x+(\eta u)_x+au_{xxx}-b\eta _{xxt}=0$$, $$u_t+\eta _x+uu_x+c\eta _{xxx}-du_{xxt}=0$$ is established. We prove that all the systems with $$a<0$$, $$c<0$$ and $$b=d$$ exhibit traveling-wave solutions with small propagation speeds. The result complements our earlier work [Discrete Contin. Dyn. Syst. 26, No. 4, 1153–1184 (2010; Zbl 1198.35191)] on a restricted family of the systems where both existence and stability of traveling-wave solutions were established in the presence of large surface tension, namely when $$a+b+c+d<0$$.

##### MSC:
 35Q53 KdV equations (Korteweg-de Vries equations) 35C07 Traveling wave solutions 35G50 Systems of nonlinear higher-order PDEs
##### Keywords:
Boussinesq system; traveling wave; existence