Matthijs Hogervorst
(LPTENS)
20/07/2013, 09:00
Non-perturbative QFT and String Theory
Talk presentation
The bootstrap program in conformal field theory aims at understanding higher-dimensional CFTs by imposing consistency conditions. These constraints rely on the knowledge of conformal blocks, which are special functions that sum up to conformal four point functions. Although they are notoriously difficult to compute, recent work has lead to a better understanding of these conformal blocks. In...
Guido Festuccia
(University of California Santa Cruz),
guido festuccia
(I)
20/07/2013, 09:23
Non-perturbative QFT and String Theory
Talk presentation
I will present some properties of R-symmetric N=1 theories on Euclidean four manifolds M which allow to preserve at least one supersymmetry. This is shown to be possible on any complex manifold. I consider in particular the dependence of supersymmetric observables on the geometric structure of M.
Anton Nedelin
(Uppsala University)
20/07/2013, 09:46
Non-perturbative QFT and String Theory
Talk presentation
In this talk I will present our recent results on 5D super Yang-Mills theory and it`s relation with 6D (2,0) superconformal theory. In particular I will discuss how N^3 behaviour of 5D super Yang-Mills free energy can be derived with the use of localization technique. And then I will show, that results obtained from localization technique in 5D super Yang-Mills are consistent with the...
Marcus Berg
(K),
Marcus Berg
20/07/2013, 10:09
Non-perturbative QFT and String Theory
Talk presentation
I will briefly review string effective actions of orientifolds with D-branes, and their relevance to string models in cosmology and phenomenology. I discuss recent work on the evaluation of string one-loop contributions to the moduli space metric of closed string moduli in toroidal minimally supersymmetric (Calabi-Yau) orientifolds with D-branes. The focus is on poorly understood (twisted)...
Prof.
Dimitri Polyakov
(CQUEST, Sogang University)
20/07/2013, 11:00
Non-perturbative QFT and String Theory
Talk presentation
We calculate the graviton's $\beta$-function in $AdS$ string-theoretic sigma-mod
el,
perturbed by vertex operators for Vasiliev's higher spin gauge fields
in $AdS_5$. The result is given by $\beta_{mn}=R_{mn}-8T_{mn}(g,u)$
(with AdS radius set to 1 and the graviton polarized
along the $AdS_5$ boundary), with the matter stress-energy
tensor $T_{mn}$ given by that of conformal holographic...
Marco Panero
(University of Helsinki)
20/07/2013, 11:23
Non-perturbative QFT and String Theory
Talk presentation
The phenomenon of jet quenching, related to the momentum broadening of a high-energy parton, provides important experimental evidence for the production of a strongly coupled, deconfined medium in heavy-ion collisions. Its theoretical description has been addressed in a number of works, both perturbatively and non-perturbatively (using the gauge-gravity duality). In this contribution,...
Michal P. Heller
(Universiteit van Amsterdam)
20/07/2013, 11:46
Non-perturbative QFT and String Theory
Talk presentation
We numerically simulate planar shock wave collisions in anti-de Sitter space as a model for heavy ion collisions of large nuclei. We uncover a cross-over between two different dynamical regimes as a function of the collision energy. At low energies the shocks first stop and then explode in a manner approximately described by hydrodynamics, in close similarity with the Landau model. At high...
Stefan Stricker
(TU Wien)
20/07/2013, 12:09
Non-perturbative QFT and String Theory
Talk presentation
Understanding the process driving the complicated field dynamics during a relativistic heavy ion collision presents and exceptionally difficult problem, where
the early onset of hydrodynamical behaviour of the produced matter points towards the system being strongly coupled.
An important aspect concerns the thermalization pattern with which the plasma constituents of different energies...
Bastian Brandt
(U)
20/07/2013, 12:32
Non-perturbative QFT and String Theory
Talk presentation
Simulations in lattice gauge theory suggest that the formation
of a flux tube between a quark and antiquark leads to quark
confinement. It is conjectured that the infrared behaviour
of the flux tube is governed by an effective string theory
and simulations show good agreement between lattice data and
its predictions. To next-to leading order (R^{-3}) in the inverse
\bar{q}q separation...
