Meson widths from string worldsheet instantons.

          @misc{ scivideos_PIRSA:08110033,
            doi = {10.48660/08110033},
            url = {https://pirsa.org/08110033},
            author = {Faulkner, Thomas},
            keywords = {Quantum Fields and Strings},
            language = {en},
            title = {Meson widths from string worldsheet instantons.},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2008},
            month = {nov},
            note = {PIRSA:08110033 see, \url{https://scivideos.org/pirsa/08110033}}
          }
          

Abstract

We discuss various properties of holographic mesons in a deconfined strongly coupled plasma. We show that such mesons obtain a width from a non-perturbative effect. On the string theory side this is due to open string modes on a D-brane tunneling into a black hole through worldsheet instantons. On the field theory side these instantons have the simple interpretation as heavy thermal quarks. We also comment on how this non-perturbative effect has important consequences for the phase structure of the Yang-Mills theory obtained in the classical gravity limit.