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 Ω × (0,T) Ω × ( 0 , T ) , $$T>0$$ T > 0 . Here, Ω ⊂ RN Ω ⊂ R N ( N ≥ 2 N ≥ 2 ) is a bounded open set, featuring a lower order term that is singular in the solution variable s .