Asymptotic dynamics of short-waves in nonlinear dispersive models

Details Asymptotic dynamics of short-waves in nonlinear dispersive models Asymptotic dynamics of short-waves in nonlinear dispersive models

1997-10-20

arxiv.org/abs/solv-int/9710013v1

Nonlinear Sciences

Exactly Solvable and Integrable Systems

to appears in Physical Review E. 4 pages, revtex files

Scientific paper

10.1103/PhysRevE.57.6206

The multiple-scale perturbation theory, well known for long-waves, is extended to the study of the far-field behaviour of short-waves, commonly called ripples. It is proved that the Benjamin-Bona-Mahony- Peregrine equation can propagates short-waves. This result contradict the Benjamin hypothesis that short-waves tends not to propagate in this model and close a part of the old controversy between Korteweg-de Vries and Benjamin-Bona-Mahony-Peregrine equations. We shown that a nonlinear (quadratic) Klein-Gordon type equation substitutes in a short-wave analysis the ubiquitous Korteweg-de Vries equation of long-wave approach. Moreover the kink solutions of phi-4 and sine-Gordon equations are understood as an all orders asymptotic behaviour of short-waves. It is proved that the antikink solution of phi-4 model which was never obtained perturbatively can be obtained by perturbation expansion in the wave-number k in the short-wave limit.

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