Gamma matrices, Majorana fermions, and discrete symmetries in Minkowski and Euclidean signature

Abstract

I describe the interplay between Minkowski and Euclidean signature gamma matrices, Majorana fermions, and discrete and continuous symmetries in all spacetime dimensions. In particular I argue that the space-time dimensions in which various classes of Majorana fermions exists are the same in both Minkowski and Euclidean signature.