Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-02-24
JHEP0604:024,2006
Physics
High Energy Physics
High Energy Physics - Theory
22 pages, 4 figures; v2: clarifications in section 5, 1 reference added; v3: the final version (minor changes, 1 more referenc
Scientific paper
10.1088/1126-6708/2006/04/024
The gluonic field created by a static quark anti-quark pair is described via the AdS/CFT correspondence by a string connecting the pair which is located on the boundary of AdS. Thus the gluonic field in a strongly coupled large N CFT has a stringy spectrum of excitations. We trace the stability of these excitations to a combination of large N suppressions and energy conservation. Comparison of the physics of the N=infinity flux tube in the {\cal N}=4 SYM theory at weak and strong coupling shows that the excitations are present only above a certain critical coupling. The density of states of a highly excited string with a fold reaching towards the horizon of AdS is in exact agreement at strong coupling with that of the near-threshold states found in a ladder diagram model of the weak-strong coupling transition. We also study large distance correlations of local operators with a Wilson loop, and show that the fall off at weak coupling and N=infinity (i.e. strictly planar diagrams) matches the strong coupling predictions given by the AdS/CFT correspondence, rather than those of a weakly coupled U(1) gauge theory.
Klebanov Igor R.
Maldacena Juan
Thorn Charles B.
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