Abstract
In this work we will study semilinear evolution problems of the form$$u_t +\Lambda u = F(t,u), t>\tau; u(\tau) = u_0,$$subjected to perturbations in the power of the linear operator, that is, perturbations given by$$(u_{\gamma})_t +\Lambda^{\gamma} u_{\gamma} = F(t,u_{\gamma}), t>\tau; u_{\gamma}(\tau) = u_0,$$with $\gamma$ in some interval containing $1$. We refer to these perturbations …