Symmetrization results for parabolic equations with a singular lower order term

We provide symmetrization results as mass concentration comparisons for solutions to singular parabolic equations in the cylinder \(\Omega \times (0,T)\) $\mathrm{\Omega }\times (0,T)$ , \(T>0\) $T>0$ . Here, \(\Omega \subset {\mathbb {R}}^N\) $\mathrm{\Omega }\subset {\mathbb{R}}^N$ ( \(N \ge 2\) $N\ge 2$ ) is a bounded open set, featuring a lower order term that is singular in the solution variable s.