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Article overview
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Refined asymptotics around solitons for gKdV equations | | Yvan Martel
; Frank Merle
; | | Date: |
8 Jun 2007 | | Abstract: | We consider the generalized Korteweg-de Vries equation $$ partial_t u +
partial_x (partial_x^2 u + f(u))=0, quad (t,x)in [0,T) imes mathbb{R}$$
with general $C^2$ nonlinearity $f$. Under an explicit condition on $f$ and
$c>0$, there exists a solution in the energy space $H^1$ of the type
$u(t,x)=Q_c(x-x_0-ct)$, called soliton. Stability theory for $Q_c$ is
well-known.
In previous works, we have proved that for $f(u)=u^p$, $p=2,3,4$, the family
of solitons is asymptotically stable in some local sense in $H^1$, i.e. if
$u(t)$ is close to $Q_{c}$ (for all $tgeq 0$), then $u(t,.+
ho(t))$ locally
converges in the energy space to some $Q_{c_+}$ as $t o +infty$, for some
$c^+sim c$.
Then, the asymptotic stability result could be extended to the case of
general assumptions on $f$ and $Q_c$.
The objective of this paper is twofold.
The main objective is to prove that in the case $f(u)=u^p$, $p=2,3,4$,
$
ho(t)-c_+ t$ has limit as $t o +infty$ under the additional assumption
$x_+ uin L^2$.
The second objective of this paper is to provide large time stability and
asymptotic stability results for two soliton solutions for the case of general
nonlinearity $f(u)$, when the ratio of the speeds of the solitons is small. The
motivation is to accompany forthcoming works devoted to the collision of two
solitons in the nonintegrable case. The arguments are refinements of previous
works specialized to the case $u(t)sim Q_{c_1}+Q_{c_2}$, for $0< c_2 ll c_1$. | | Source: | arXiv, arxiv.0706.1178 | | Services: | Forum | Review | PDF | Favorites | |
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