Freiburg 2008 – scientific programme

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T: Fachverband Teilchenphysik

T 21: Quantenfeldtheorie I

T 21.4: Talk

Thursday, March 6, 2008, 17:35–17:50, KGI-HS 1016

Thermal spectral functions and diffusion from AdS/CFT — •Matthias Kaminski, Johanna Erdmenger, and Felix Rust — Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Föhringer Ring 6, 80805 München, Germany

We utilize the AdS/CFT duality to examine thermal spectral functions of vector mesons at strong coupling in the deconfined phase having survived the deconfinement transition. We work at finite baryon or isospin density. The gauge/gravity duality relates strongly coupled super-Yang-Mills theory (CFT) at finite temperature to supergravity at weak coupling in a space with Anti-de Sitter (AdS) black hole metric. After reviewing the holographic methods developed in this context, we show results on the spectra and diffusion properties comparing to lattice data and effective theories of QCD. Spectra show meson-mass-peaks at distinct resonance frequencies corresponding to the meson masses. The location of the resonances has a minimum as a function of temperature. Furthermore, the diffusion coefficient exhibits a first order phase transition. Features of the spectra and diffusion are related to the phase diagram of this theory.