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On small data scattering for 2-dimensional semilinear wave equations. (English) Zbl 0768.35063
The authors consider the wave equation in two dimensions, with nonlinear zero-order term of the type $$| u|^{\rho-1}u$$ or $$| u|^ \rho$$, where $$\rho$$ is greater than some critical value. Comparing it with the free linear wave equation, they show the existence of the scattering operator acting on a dense set of a neighborhood of zero in the energy norm. More precisely, for sufficiently small and regular initial data, they construct a solution of the nonlinear equation behaving at $$-\infty$$ as the solution of the linear initial-value problem, and whose behaviour at $$+\infty$$ is the same as some other solution of the free wave equation.

##### MSC:
 35P25 Scattering theory for PDEs
##### Keywords:
nonlinear wave equation; nonlinear scattering
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