Mesons in gauge/gravity duals

Springer Science and Business Media LLC - Tập 35 - Trang 81-133 - 2008
J. Erdmenger1, N. Evans2,3, I. Kirsch4, E. J. Threlfall2
1Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), München, Germany
2School of Physics and Astronomy, Southampton University, Southampton, UK
3Isaac Newton Institute for Mathematical Sciences, Cambridge, UK
4Institut für Theoretische Physik, ETH Zürich, Zürich, Switzerland

Tóm tắt

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 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 Some previously unpublished results are also included.

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