2025 - T1 - Representation theory and noncommutative geometry

Collection 2025 - T1 - Representation theory and noncommutative geometry

Organisateur(s) Afgoustidis, Alexandre ; Aubert, Anne-Marie ; Clare, Pierre ; Frahm, Jan ; Pasquale, Angela ; Şengün, Haluk
Date(s) 06/01/2025 - 04/04/2025
URL associée https://indico.math.cnrs.fr/event/10843/
77 112

The Baum-Connes conjecture for real reductive groups - Part 3/10

De Nigel Higson

The imaginary part of the infinitesimal character

Definition of the infinitesimal character. The infinitesimal character of a parabolically induced representation. Continuity of the infinitesimal character. The imaginary part of the infinitesimal character. A filtration of the reduced C-algebra of a real reductive group by ideals. Some low-real-rank examples. A theorem of Bruhat and Harish-Chandra about irreducible parabolic induction. Characterization of the fibers of the imaginary part of the infinitesimal character using tempiric representations. Discrete series representations versus tempiric representations. Characterization of the subquotients for the filtration of the reduced group C-algebra by ideals. The Mackey bijection.

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Watch parts 9 and 10

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