Thu·Nov 29, 2007Thursday·November 29, 2007

1. 01*

   Mesons in Gauge/Gravity Duals - A Review

   Johanna Erdmenger🇩🇪 · Nick Evans🇬🇧 · Ingo Kirsch🇨🇭 · Ed Threlfall🇬🇧

   We review recent progress in studying mesons within gauge/gravity duality, in the context of adding flavour degrees of freedom to generalizations of the AdS/CFT correspondence. Our main focus is on the `top-down approach' of considering models constructed within string theory. We explain the string-theoretical constructions in detail, aiming at non-specialists. These give rise to a new way of describing strongly coupled confining large N gauge gauge theories similar to large N QCD. In particular, we consider gravity dual descriptions of spontaneous chiral symmetry breaking, and compare with lattice results. A further topic covered is the behaviour of flavour bound states in finite temperature field theories dual to a gravity background involving a black hole. We also describe the `bottom up' phenomenological approach to mesons within AdS/QCD. -- Some previously unpublished results are also included.

   ↳ hep-thhep-lathep-phEPJA(2008)·555 citations
2. 02*

   New features of the gluon and ghost propagator in the infrared region from the Gribov-Zwanziger approach

   D.Dudal🇧🇪 · S.P.Sorella🇧🇷 · N.Vandersickel🇧🇪 · H.Verschelde🇧🇪

   So far, the infrared behavior of the gluon and ghost propagator based on the Gribov-Zwanziger approach predicted a positivity violating gluon propagator vanishing at zero momentum, and an infrared enhanced ghost propagator. However, recent data based on huge lattices have revealed a positivity violating gluon propagator which turns out to attain a finite nonvanishing value very close to zero momentum. At the same time the ghost propagator does not seem to be infrared enhanced anymore. We point out that these new features can be accounted for by yet unexploited dynamical effects within the Gribov-Zwanziger approach, leading to an infrared behavior in qualitatively good agreement with the new data.

   ↳ hep-thhep-lathep-phPRD(2008)·257 citations
3. 03*

   Universality of large N phase transitions in Wilson loop operators in two and three dimensions

   R. Narayanan🇺🇸 · H. Neuberger🇺🇸

   The eigenvalue distribution of a Wilson loop operator of fixed shape undergoes a transition under scaling at infinite N. We derive a large N scaling function in a double scaling limit of the average characteristic polynomial associated with the Wilson loop operator in two dimensional QCD. We hypothesize that the transition in three and four dimensional large N QCD are also in the same universality class and provide a numerical test for our hypothesis in three dimensions.

   ↳ hep-thhep-latJHEP(2007)·49 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.