A local conjecture on Brauer character degrees of finite groups

Details A local conjecture on Brauer character degrees of finite groups A local conjecture on Brauer character degrees of finite groups

2004-04-27

arxiv.org/abs/math/0404483v2

Mathematics

Group Theory

12 pages; minor changes; final version, to appear in Trans. Am. Math. Soc

Scientific paper

Recently, a new conjecture on the degrees of the irreducible Brauer characters of a finite group was presented by the second author. In this paper we propose a 'local' version of this conjecture for blocks B of finite groups, giving a lower bound for the maximal degree of an irreducible Brauer character belonging to B in terms of the dimension of B and well-known invariants like the defect and the number of irreducible Brauer characters. We also propose a weaker version of this conjecture for which a slight reformulation leads to interesting open questions about traces of Cartan matrices of blocks. We then show that the strong conjecture is true for blocks with one simple module, blocks of p-solvable groups and blocks with cyclic defect groups. It also holds for many further examples of blocks of sporadic groups, symmetric groups or groups of Lie type. We also show that the weak conjecture is true for blocks of tame representation type.

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