A Note on Enhanced Gauge Symmetries in M- and String Theory

Details A Note on Enhanced Gauge Symmetries in M- and String Theory A Note on Enhanced Gauge Symmetries in M- and String Theory

1997-07-13

arxiv.org/abs/hep-th/9707123v2

JHEP 9709:001,1997

Physics

High Energy Physics

High Energy Physics - Theory

LaTeX file, 12 pages, minor sign errors corrected

Scientific paper

10.1088/1126-6708/1997/09/001

Two different mechanisms exist in non-perturbative String / M- theory for enhanced SU(N) (SO(2N)) gauge symmetries. It can appear in type IIA string theory or M-theory near an $A_{N-1}$ (D_N) type singularity where membrnes wrapped around two cycles become massless, or it can appear due to coincident D-branes (and orientifold planes) where open strings stretched between D-branes become massless. In this paper we exhibit the relationship between these two mechanisms by displaying a configuration in M-theory, which, in one limit, can be regarded as membranes wrapped around two cycles with $A_{N-1}$ (D_N) type intersection matrix, and in another limit, can be regarded as open strings stretched between N Dirichlet 6-branes (in the presence of an orientifold plane).

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