W2-4 Fields and Strings (DTP) | Champs et cordes (DPT)
- Svetlana Barkanova (Acadia University)
I review applications of holographic framework to out of equilibrium dynamics in strong coupled gauge theories. Potential applications range from physics of heavy-ion collisions to properties of primordial quark-gluon plasma in early Universe.
Non-perturbative techniques are needed to study strongly coupled systems.
One popular method is the 2 particle irreducible (2pi) effective theory.
For scalar theories, calculations at the 3 loop level show improved convergence, relative to perturbative results.
We present results in $\phi^4$ theory at the 4 loop level which show that convergence breaks down at large coupling.
For phases like quark-gluon plasmas, the strong-coupling nature of the system means that perturbative approximations are invalid, and therefore conventional solution methods break down. However, using a duality first established by string theory, we are able to relate strongly coupled quantum field theories to weakly coupled gravitational systems (in one higher dimension). The most common use...