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Exploring improved holographic theories for QCD: part I
Gürsoy U., Kiritsis E.
Journal of High Energy Physics 02 (2008) 032 - http://hal.archives-ouvertes.fr/hal-00739296
Physique/Physique des Hautes Energies - Réseau
Physique/Physique des Hautes Energies - Phénoménologie
Physique/Physique des Hautes Energies - Théorie
Exploring improved holographic theories for QCD: part I
U. Gürsoy1, 2, E. Kiritsis1, 3, 4
1 :  CPHT - Centre de Physique Théorique [Palaiseau]
CNRS : UMR7644 – Polytechnique - X
Ecole Polytechnique 91128 Palaiseau cedex
2 :  LPTENS - Laboratoire de Physique Théorique de l'ENS
CNRS : UMR8549 – Université Pierre et Marie Curie (UPMC) - Paris VI – École normale supérieure [ENS] - Paris
24 rue Lhomond, 75231 Paris CEDEX 05
3 :  APC - UMR 7164 - AstroParticule et Cosmologie
CNRS : UMR7164 – IN2P3 – Observatoire de Paris – Université Paris VII - Paris Diderot – CEA : DSM/IRFU
APC - UMR 7164, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, case postale 7020, F-75205 Paris Cedex 13
4 :  Physics Department
University of Crete
University of Crete Department of Physics P.O Box 2208 GR-71003 Heraklion, Greece
Various holographic approaches to QCD in five dimensions are explored using input both from the putative five-dimensional non-critical string theory as well as QCD. It is argued that a gravity theory in five dimensions coupled to a dilaton and an axion may capture the important qualitative features of pure YM theory. A part of the effects of higher α'-corrections is resummed into a dilaton potential. The potential is shown to be in one-to-one correspondence with the exact β-function of QCD, and its knowledge determines the full structure of the vacuum solution. The geometry near the UV boundary is that of AdS5 with logarithmic corrections reflecting the asymptotic freedom of QCD. We find that all relevant confining backgrounds have an IR singularity of the ''good" kind that allows unambiguous spectrum computations. Near the singularity the 't Hooft coupling is driven to infinity. Asymptotically linear glueball masses can also be achieved. The classification of all confining asymptotics, the associated glueball spectra and meson dynamics are addressed in a companion paper arXiv:0707.1349

Journal of High Energy Physics
Publisher Institute of Physics (IOP)
ISSN 1126-6708 (eISSN : 1029-8479)
Articles dans des revues avec comité de lecture

37+23 pages, 11 figures. (v3) Some clarifications and typo corrections. Journal version

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