Large time behavior for a quasilinear diffusion equation with critical gradient absorption
Résumé
We study the large time behavior of non-negative solutions to the
nonlinear diffusion equation with critical gradient absorption
$$
\partial_t u-\Delta_{p}u+|\nabla u|^{q_*}=0 \quad \hbox{in} \
(0,\infty)\times\mathbb{R}^N\ ,
$$
for $p\in(2,\infty)$ and $q_*:=p-N/(N+1)$. We show that the
asymptotic profile of compactly supported solutions is given by a
source-type self-similar solution of the $p$-Laplacian equation with suitable logarithmic time and space scales. In the process, we also get optimal decay rates for compactly supported solutions and optimal expansion rates for their supports that strongly improve previous results.
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