Kirillov's conjecture and $\CaD$-modules

Details Kirillov's conjecture and $\CaD$-modules Kirillov's conjecture and $\CaD$-modules

2009-10-15

arxiv.org/abs/0910.2900v1

Mathematics

Representation Theory

Scientific paper

In the theory of Lie groups, the irreducibility of a unitary representation is not preserved in general by restriction to a subgroup. Kirillov's conjecture says that it is preserved for the groups Gl(n,R) or Gl(n,C) when the subgroup is the subgroup of matrices leaving invariant a non zero vector. This conjecture was proved by Barush using a detailed study of nilpotent orbits. In fact, it is not difficult to see that the conjecture is equivalent to the fact that some system of partial differential equations has no singular distributions as solutions. This system of equations is a regular holonomic D-module and we give a proof of the result by an explicit calculation of the roots of the b-functions associated to this D-module.

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