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# Asymptotic stability of solitary waves for the Benjamin-Bona-Mahony equation

• We prove the asymptotic stability in $H^1(\mathbb R)$ of the family of solitary waves for the Benjamin-Bona-Mahony equation,

$(1-\partial^2_x)u_t+(u+u^2)_x=0.$

We prove that a solution initially close to a solitary wave, once conveniently translated, converges weakly in $H^1(\mathbb R)$, as time goes to infinity, to a possibly different solitary wave. The proof is based on a Liouville type theorem for the flow close to the solitary waves, and makes an extensive use of a monotonicity property.

Mathematics Subject Classification: 35B40, 35Q51, 35Q53.

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