We study the theory of representations of a 2-group G in Baez-Crans 2-vector spaces over a field k of arbitrary characteristic, and the corresponding 2-vector spaces of intertwiners. We also characterize the irreducible and indecomposable representations. Finally, it is shown that when the 2-group is finite and the base field k is of characteristic zero or coprime to the orders of the homotopy groups of G, the theory essentially reduces to the theory of k-linear representations of the first homotopy group of G, the remaining homotopy invariants of G playing no role.
Keywords: 2-groups (categorical groups); 2-vector spaces; Representations; 2-categories
2010 MSC: 18D05, 18D10, 20L05
Theory and Applications of Categories, Vol. 31, 2016, No. 32, pp 907-927.