Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1996-05-29
Nucl.Phys. B489 (1997) 95-121
Physics
High Energy Physics
High Energy Physics - Theory
34 pages, LaTeX, 5 figures added
Scientific paper
10.1016/S0550-3213(96)00702-X
When $N$ five-branes of M-theory coincide the world-volume theory contains tensionless strings, according to Strominger's construction. This suggests a large $N$ limit of tensionless string theories. For the small $E_8$ instanton theories, the definition would be a large instanton number. An adiabatic argument suggests that in the large $N$ limit an effective extra uncompactified dimension might be observed. We also propose ``surface-equations'', which are an analog of Makeenko-Migdal loop-equations, and might describe correlators in the tensionless string theories. In these equations, the anti-self-dual two forms of 6D and the tensionless strings enter on an equal footing. Addition of strings with CFTs on their world-sheet is analogous to addition of matter in 4D QCD.
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