Soit un espace préhomogène (en abrégé ) régulier, où est un groupe algébrique réductif, défini sur . Si est une décomposition de en représentations irréductibles, alors, en général, les espaces préhomogènes ne sont pas réguliers. Dans cet article nous introduisons la notion de quasi-irréductible (en abrégé -irréducible), et nous montrons d’abord que pour les complètement -réductibles, les composantes -isotypiques sont définies de manière intrinsèque, comme en théorie ordinaire des représentations. Nous montrons également que, dans un sens approprié, tout régulier est une somme directe de quasi-irréductibles. Finalement nous classifions les de type parabolique qui sont -irréductibles.
Let be a regular prehomogeneous vector space (abbreviated to ), where is a reductive algebraic group over . If is a decomposition of into irreducible representations, then, in general, the PV’s are no longer regular. In this paper we introduce the notion of quasi-irreducible (abbreviated to -irreducible), and show first that for completely -reducible ’s, the -isotypic components are intrinsically defined, as in ordinary representation theory. We also show that, in an appropriate sense, any regular PV is a direct sum of -irreducible ’s. Finally we classify the -irreducible PV’s of parabolic type.
Keywords: reductive groups, prehomogeneous vector spaces, relative invariants, prehomogeneous vector spaces of parabolic type
Mot clés : Groupes réductifs, espaces préhomogènes, invariants relatifs, espaces préhomogènes de type parabolique
Rubenthaler, Hubert 1
@article{AIF_2011__61_5_2183_0, author = {Rubenthaler, Hubert}, title = {Decomposition of reductive regular {Prehomogeneous} {Vector} {Spaces}}, journal = {Annales de l'Institut Fourier}, pages = {2183--2218}, publisher = {Association des Annales de l{\textquoteright}institut Fourier}, volume = {61}, number = {5}, year = {2011}, doi = {10.5802/aif.2670}, mrnumber = {2961852}, zbl = {1250.11100}, language = {en}, url = {https://aif.centre-mersenne.org/articles/10.5802/aif.2670/} }
TY - JOUR AU - Rubenthaler, Hubert TI - Decomposition of reductive regular Prehomogeneous Vector Spaces JO - Annales de l'Institut Fourier PY - 2011 SP - 2183 EP - 2218 VL - 61 IS - 5 PB - Association des Annales de l’institut Fourier UR - https://aif.centre-mersenne.org/articles/10.5802/aif.2670/ DO - 10.5802/aif.2670 LA - en ID - AIF_2011__61_5_2183_0 ER -
%0 Journal Article %A Rubenthaler, Hubert %T Decomposition of reductive regular Prehomogeneous Vector Spaces %J Annales de l'Institut Fourier %D 2011 %P 2183-2218 %V 61 %N 5 %I Association des Annales de l’institut Fourier %U https://aif.centre-mersenne.org/articles/10.5802/aif.2670/ %R 10.5802/aif.2670 %G en %F AIF_2011__61_5_2183_0
Rubenthaler, Hubert. Decomposition of reductive regular Prehomogeneous Vector Spaces. Annales de l'Institut Fourier, Tome 61 (2011) no. 5, pp. 2183-2218. doi : 10.5802/aif.2670. https://aif.centre-mersenne.org/articles/10.5802/aif.2670/
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