Universality of Low Energy Absorption Cross Sections for Black Holes

This is the authors' abstract. We don't add key points for this paper.

In this paper we compute the low energy absorption cross section for minimally coupled massles scalars and spin- $1/2$ particles into a general spherically symmetric black hole in arbitrary dimensions. The scalars have a cross section equal to the area of the black hole, while the spin- $1/2$ particles give the area measured in a flat spatial metric conformally related to the true metric.