Une classe d'espaces préhomogènes de type parabolique faiblement sphériques

Details Une classe d'espaces préhomogènes de type parabolique faiblement sphériques Une classe d'espaces préhomogènes de type parabolique faiblement sphériques

2008-10-17

arxiv.org/abs/0810.3148v1

Mathematics

Representation Theory

Scientific paper

For absolutely simple, finite-dimensional Lie algebras g of rank at least 2, defined over a local field of characteristic 0 and admitting a graduation: g=g(-2)+g(-1)+g(0)+g(1)+g(2) given by an element H such that 2H is simple, we construct parabolic subgroups P of the automorphism group of g which centralize H, having geometric prehomogeneous action on g(1) and g(-1). We study the structure of these prehomogeneous vector spaces. We prove that the Zeta functions associated to the fundamental invariants for the P action on g(1) and g(-1) have meromorphic extensions which satisfy functional equations. We give the explicit calculus of the coefficients of these functional equations and the Bernstein polynomials associated to these fundamental invariants in the archimedian case, by reducing the problem to a similar problem for centralizers of pair of commuting sl(2) Lie algebras. This work is a generalization of well-known results when g(2)=0.

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