The characters of all unitary irreducible representations of the (d+1)-dimensional de Sitter spacetime isometry algebra so(1, d+1) are derived, leading to a dictionary between those representations and massive or (partially) massless fields on de Sitter spacetime of arbitrary dimension. We propose a way of taking the flat limit of representations in (anti-) de Sitter spaces in terms of these characters, and conjecture the spectrum resulting from taking the flat limit of mixed-symmetry fields in de Sitter spacetime. The equivalent of the scalar singleton for the de Sitter (dS) spacetime is presented.

Noncommutative Geometry and Applications to Quantum Physics (CIMPA Research School)

CIMPA School organized by T. Masson and R. Triay (CPT)

Noncommutative Geometry (NCG) is a vivid research subject in Mathematics and Physics. The main goal of this school is to train local researchers and students in these topics and to establish strong research collaborations with colleagues, students and researchers. Leading experts in NCG will give an overview of the main well-established results, the essential tools, and some of the present active research activities :

 Connes-Chern Character Theorem
 Noncommutative Integration Theory (Dixmier Traces, Singular Traces…)
 Unbounded $KK$-theory and Kasparov Product
 Dynamical Systems and KMS States
 Quantum Groups
 Fuzzy Spaces
 Noncommutative Standard Model of Particle Physics
 Application to the QHE…

Nanophysics, from fundamental to applications : reloaded

Ecole organisée par T. Martin, T. Jonckheere et J. Rech (CPT)

This biennial conference brings together specialists on recent insights in General Relativity and Gravitation. The aim is to stimulate debates on hot topics in views of providing us with innovating ideas on emerging problems. The conference organization is based on an optimal number of concise presentations, which provides us with enough space for discussions in order to favour interactions among participants.

See here for more details.