AdS/QCD: The Relevance of the Geometry

Details AdS/QCD: The Relevance of the Geometry AdS/QCD: The Relevance of the Geometry

2009-06-25

arxiv.org/abs/0906.4562v2

JHEP 1001:074,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages + appendix. v2 minor changes and Refs. added

Scientific paper

10.1007/JHEP01(2010)074

We investigate the relevance of the metric and of the geometry in five-dimensional models of hadrons. Generically, the metric does not affect strongly the results and even flat space agrees reasonably well with the data. Nevertheless, we observe a preference for a decreasing warp factor, for example AdS space. The Sakai-Sugimoto model reduces to one of these models and the level of agreement is similar to the one of flat space. We also consider the discrete version of the five-dimensional models, obtained by dimensional deconstruction. We find that essentially all the relevant features of "holographic" models of QCD can be reproduced with a simple 3-site model describing only the states below the cut-off of the theory.

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