Mercredi 24 juin à 11h, salle 114
Heng-Tong Ding and Anthony Francis (Bielefeld University) : Chosen aspects of QCD on the lattice
Jeudi 11 juin à 11h, salle 114
Alexandre Giraud (APC) : Dynamics of fermions during preheating after inflation
Mercredi 3 juin à 11h, salle 114
Charles Bouchart (LPT) : Introduction to particle physics in Randall-Sundrum models
Vendredi 28 mai à 11h, salle 114
Sofiane Faci (APC, Université Paris 7) : Conformal quantization of the massless spin 1 on de Sitter space
We quantize the Maxwell (``massless spin one") de Sitter field in a conformally invariant gauge. This quantization is invariant under the SO$_0(2,4)$ group and consequently under the de Sitter group. We obtain a new de Sitter-invariant two-point function which is very simple. Our method relies on the one hand, on a geometrical point of view which uses the realization of Minkowski, de Sitter and anti- de Sitter spaces as intersections of the null cone in $\setR^6$ and a moving plane, and on the other hand, on a canonical quantization scheme of the Gupta-Bleuler type.
Mardi 26 mai à 14h, salle 114
Jean-Emile Bourgine (Ipht, CEA) : Matrix Models and 2D Gravity : The O(n)
model example
I will start with a brief review of conformal field theories (CFT)
that show up in the continuum description of lattice statistical
models. Then I will introduce the matrix model techniques on the
special case of the O(n) model. I will explain how the matrix model
can generate random lattices and how appears the coupling of the
CFT to 2D gravity in the continuum limit. This will lead us to the
famous KPZ relation between conformal dimension of the CFT
operators and gravitational dimensions.
Mercredi 22 mai à 11h, salle 114
Raphaël Benichou (LPTENS) : Sigma-models on supergroup manifolds
Mardi 12 mai à 11h, salle 114
Benoît Vicedo (Ipht, CEA) : Integrability in non-linear sigma-models
Mercredi 6 mai à 11h, salle 114
Charalampos Bogdanos (LPT) : Brane-Worlds : Pre-Randall-Sundrum scenarios
Mercredi 29 avril à 11h, salle 114
Claire Picq (APC) : Neutrinos III : Antares
Mercredi 22 avril à 11h, salle 114
Rachel Queval (CEA) & Memphino, Michela Marafini (APC) : Neutrinos II : Double-Chooz