Higher torsion in p-groups, Casimir operators and the classifying spectral sequence of a Lie algebra

Details Higher torsion in p-groups, Casimir operators and the classifying spectral sequence of a Lie algebra Higher torsion in p-groups, Casimir operators and the classifying spectral sequence of a Lie algebra

2010-07-15

arxiv.org/abs/1007.2683v1

Mathematics

Algebraic Topology

57 pages, 2 figures

Scientific paper

We study exceptional torsion in the integral cohomology of a family of p-groups associated to p-adic Lie algebras. A spectral sequence E_r^{*,*}[g] is defined for any Lie algebra g which models the Bockstein spectral sequence of the corresponding group in characteristic p. This spectral sequence is then studied for complex semisimple Lie algebras like sl_n(C), and the results there are transferred to the corresponding p-group via the intermediary arithmetic Lie algebra defined over Z. Over C, it is shown that E_1^{*,*}[g]=H^*(g,U(g)^*)=H^*(\Lambda BG) where U(g)^* is the dual of the universal enveloping algebra of g and \Lambda BG is the free loop space of the classifying space of a Lie group G associated to g. In characteristic p, a phase transition is observed. For example, it is shown that the algebra E_1^{*,*}[sl_2[F_p]] requires at least 17 generators unlike its characteristic zero counterpart which only requires two.

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