Comparison results for the fractional heat equation with a singular lower order term

We provide symmetrization results in the form of mass concentration comparisons for fractional singular parabolic equations in infinite cylinders of the type Omega x(0,T), where Omega subset of R-N (N >= 2) is a bounded, open set with Lipschitz boundary, and T>0. The fundamental ingredients of the proof are an implicit time discretization procedure and a max/min argument, previously applied to nonlocal elliptic problems in the recent paper Brandolini et al. (2023).