Convergence to the travelling wave solution for a nonlinear reaction-diffusion equation

Kamin, Shoshana ; Rosenau, Philip

Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni, Série 9, Tome 15 (2004) no. 3-4, pp. 271-280

Résumé

We study the behaviour of the solutions of the Cauchy problem $$u_{t} = (u^{m})_{xx}+u(1-u^{m-1}), \quad x \in \mathbb{R}, \quad t > 0 \quad u(0,x)=u_{0}(x), \quad u_{0}(x) \ge 0,$$ and prove that if initial data $u_{0}(x)$ decay fast enough at infinity then the solution of the Cauchy problem approaches the travelling wave solution spreading either to the right or to the left, or two travelling waves moving in opposite directions. Certain generalizations are also mentioned.