Speaker: Ryuichiro Kitano
Title: Hadron Physics and 3d dualities
Host: John Terning
Room: 432
Abstract: When one of the space-time dimension is compactified on S1, the QCD exhibits the chiral phase transition at some critical radius. When we further turn on a background θ term which depends on the S1 compactified coordintate, a topological ordered phase appears at low energy via the winding of θ. We discuss what kind of theories can describe the physics near the critical point by requiring the matching of topological field theories in the infrared. As one of the possibilities, we propose a scenario where the ρ and ω mesons form a U(Nf) gauge theory near the critical point. In the phase where the chiral symmetry is restored, they become the dual gauge boson of the gluon related by the level-rank duality between the three dimensional gauge theories.
User:
High-Energy Seminars
Time:
1:30pm - 2:30pm
Location:
Room 432
Send Reminder:
Yes - 0 days 4 hour 0 minutes before start
Description:
Speaker: Wen Yin
Title: Baryogenesis via active neutrino oscillation
Host: John Terning
Room: 432
Abstract: Just after the inflation, leptons can be produced from direct decay of the inflaton or scattering. These leptons undergo flavor oscillation which can induce CP-violation, until they are thermalized. By using the Lagrangian of the Standard Model with the Majorana neutrino mass terms, llHH, we follow the time evolution of the density matrices of the leptons in this very first stage of the Universe. It turns out that the CP violation can explain the baryon asymmetry of the Universe. In the case that the leptons are produced by the scattering between the Higgs boson and the thermal plasma, the CP-violation originates from the CP phases in the Pontecorvo-Maki-Nakagawa-Sakata matrix and thus the scenario can be tested by terrestrial experiments. We also discuss an application of the mechanism.
