G. Todorova, CAUCHY-PROBLEM FOR A NONLINEAR-WAVE EQUATION WITH NONLINEAR DAMPING AND SOURCE TERMS, Comptes rendus de l'Academie des sciences. Serie 1, Mathematique, 326(2), 1998, pp. 191-196
We study the Cauchy problem for the nonlinear wave equation with nonli
near damping au(t)\u(t)\(m-1) and a nonlinear source term of type bu\u
\(p-1). When 1 < p less than or equal to m, a global existence result
is established for any initial data. When 1 < m < p, a finite time blo
w-up result is proved for compactly supported data with negative initi
al energy.