Holographic like models as a five-dimensional rewriting of large-Nc QCD

Details Holographic like models as a five-dimensional rewriting of large-Nc QCD Holographic like models as a five-dimensional rewriting of large-Nc QCD

2010-01-18

arxiv.org/abs/1001.3105v2

Int.J.Mod.Phys.A25:5683-5710,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

33 pages, a considerably modified version, a part of conclusions are changed, to be published in Int. J. Mod. Phys. A

Scientific paper

10.1142/S0217751X10051049

The AdS/QCD models are known to be tightly related with the QCD sum rules in the large-Nc (called also planar) limit. Rewriting the theory of infinite tower of free stable mesons expected in the large-Nc QCD as a five-dimensional theory we scrutinize to what extend the bottom-up holographic models may be viewed as an alternative language expressing the phenomenology of planar QCD sum rules. It is found that many features of AdS/QCD models can be thereby obtained without invoking prescriptions from the original AdS/CFT correspondence. Under some assumptions, all possibilities leading to simple Regge trajectories are classified and it is argued that the most phenomenologically consistent model is the one called "soft wall model" in the holographic approach, with a preference to the positive-sign dilaton background.

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