AdS/QCD : Towards a holographic description of QCD. The particular case of the glueballs

por Frederic Jugeau (INFN Bari)

miércoles 21 mar. 2007 12:00 → 13:00 Europe/Madrid

Sala Seminarios IFIC (Edf. Institutos de Investigación)

A breakthrough in the attempt to understand non-perturbative Yang-Mills theories came with the AdS/CFT conjecture, proposed by Maldacena, that a connection could be established between the large N limit of a superconformal SU(N) gauge theory defined in d dimensions and a supergravity theory living on a d+1 anti-de Sitter space (AdS). In this talk, I will attempt to expose how it is possible to extend AdS/CFT correspondence to QCD (being neither SUSY nor conformal so that its gravity dual theory is unknown). I will pursue by describing a holographic model of QCD for glueballs. Especially, I will show that it is necessary to modify the AdS geometry in order to recover the spectrum hierarchy between the scalar and pseudoscalar glueballs.