Rencontre de Physique des Particules 2015

Session

New Theoretical Developments

16 janv. 2015, 16:05

Amphi Hermite (Institut Henri Poincaré)

37. Recent developments in formal high energy physics

Dr Guillaume Bossard (CPhT)

16/01/2015 16:05

I will review several recent important developments in high energy physics, including: -Perturbative and non-perturbative results in supersymmetric non-abelian gauge theories (AdS / CFT, Localisation, non-Langrangian theories). -Superstring and supergravity amplitudes, 3-loop amplitude in string theory, color kinematic duality and double copy, BMS symmetry and infrared behaviour. -Black...

57. Renormalization Group Flows for Quantum Gravity

Prof. Vincent RIVASSEAU

16/01/2015 16:30

We shall review briefly some current approaches to quantum gravity, focusing in particular on the recent progress on tensor-based models which sum over all discretized space-time geometries and can be shown renormalizable and asymptotically free.

26. Renormalization Group Optimized Perturbation: some illustrations at zero and finite temperature.

Jean-Loic Kneur (LCC Montpellier)

16/01/2015 16:50

We discuss our recently developed variant of the so-called optimized perturbation (OPT), 'RGOPT', consistently resumming renormalization group dependence generically for zero or finite temperature theories. It is illustrated with a rather precise determination of 1) the QCD basic scale and coupling from the pion decay constant $F_\pi$: $\alpha_S(m_Z)[\overline{MS}] \simeq 0.1174 \pm 0.002$;...

29. From OPE to Soft-Wall

Dr David Greynat (Universita di Napoli and INFN)

16/01/2015 17:05

We will show how it is possible to implement a chiral symmetry breaking mechanism in soft-wall model of holographic QCD. By perturbing a dilaton potential, we show also that it is possible to reproduce the exact Operator Product Expansion and the spectrum of the vector-vector and axial-axial correlators in the Large-N$_c$ limit.

48. Nonrenormalizablity of nonequilibrium quantum field theory in the classical approximation

Dr Bin Wu (IPhT, CEA/Saclay)

16/01/2015 17:20

Nonequilibrium quantum field theory in the classical statistical approximation (CSA) has a broad range of applications to understanding thermalization of systems with a large occupation number both in cosmology and in ultra-relativistic heavy-ion collisions. In my talk, I would like first to give a brief introduction to the CSA in the $g^2\phi^4$ theory. Then, I will present our discovery of...