Equivalences between blocks of p-local Mackey algebras

preprint2014arXivOpen access

Abstract

Let GG be a finite group and (K,O,k)(K,\mathcal{O},k) be a pp-modular system. Let R=OR=\mathcal{O} or kk. There is a bijection between the blocks of the group algebra and the blocks of the so-called pp-local Mackey algebra μR1(G)μ_{R}^{1}(G). Let bb be a block of RGRG with abelian defect group DD. Let b′b' be its Brauer correspondant in NG(D)N_{G}(D). It is conjectured by Broué that the blocks RGbRGb and RNG(D)b′RN_{G}(D)b' are derived equivalent. Here we look at equivalences between the corresponding blocks of pp-local Mackey algebras. We prove that an analogue of the Broué's conjecture is true for the pp-local Mackey algebras in the following cases: for the principal blocks of pp-nilpotent groups and for blocks with defect 11. We also point out the probable importance of \emph{splendid} equivalences for the Mackey algebras.

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