A nonlinear parabolic problem with singular terms and nonregular data

Abstract

We study existence of nonnegative solutions to a nonlinear parabolic boundary value problem with a general singular lower order term and a nonnegative measure as nonhomogeneous datum, of the form \begin{cases} \dys u_t - \Delta_p u = h(u)f+\mu & \text{in}\ \Omega \times (0,T),\\ u=0 &\text{on}\ \partial\Omega \times (0,T),\\ u=u_0 &\text{in}\ \Omega \times \{0\}, \end{cases} where $\Omega$ is an open bounded subset of $\mathbb{R}^N$ ($N\ge2$), $u_0$ is a nonnegative integrable function, $\Delta_p$ is the $p$-Laplace operator, $\mu$ is a nonnegative bounded Radon measure on $\Omega \times (0,T)$ and $f$ is a nonnegative function of $L^1(\Omega \times (0,T))$. The term $h$ is a positive continuous function possibly blowing up at the origin. Furthermore, we show uniqueness of finite energy solutions in presence of a nonincreasing $h$