Centre de Physique Théorique


Juillet 2017

Mercredi 5 juillet 14:00-15:00, Amphi 5 du CPT

On the adiabatic theorem when eigenvalues dive into the continuum

Horia Cornean, (Aalborg University, Danemark)


For a Wigner-Weisskopf model of an atom consisting of a
quantum dot coupled to an energy reservoir described by a
three-dimensional Laplacian we study the survival probability of a bound
state when the dot energy varies smoothly and adiabatically in time. The
initial state corresponds to a discrete eigenvalue which dives into the
continuous spectrum and re-emerges from it as the dot energy is varied
in time and finally returns to its initial value. Our main result is
that for a large class of couplings, the survival probability of this
bound state vanishes in the adiabatic limit. This is joint work with
H.K. Knörr, A. Jensen and G. Nenciu. Available online here :

Vendredi 7 juillet 14:00-15:00, Amphi 5 du CPT

Mixed-symmetry fields in de Sitter : a group-theoretical glance

Nicolas Boulanger (Univ. de Mons Belgique)

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.

Du 12 au 22 juillet, Quy Nhon, Vietnam

Noncommutative Geometry and Applications to Quantum Physics

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…

Du 30 juillet au 5 août, Quy Nhon, Vietnam

Nanophysics, from fundamental to applications : reloaded

Nanophysics, from fundamental to applications : reloaded

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

Du 30 juillet au 5 août, Quy Nhon, Vietnam

Hot Topics in General Relativity and Gravitation (HTGRG-3)

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.