Exceptional groups from open strings

Abstract

We consider type IIB theory compactified on a two-sphere in the presence of mutually nonlocal 7-branes. The BPS states associated with the gauge vectors of exceptional groups are seen to arise from open strings connecting the 7-branes, and multi-pronged open strings capable of ending on more than two 7-branes. These multi-pronged strings are built from open string junctions that arise naturally when strings cross 7-branes. The different string configurations can be multiplied as traditional open strings, and are shown to generate the structure of exceptional groups.

25 pages, LATEX, 9 figures; minor changes, two references added

References in corpus (2)

• Type IIB Superstrings, BPS Monopoles, And Three-Dimensional Gauge Dynamics
• A Non-Supersymmetric Open String Theory and S-Duality

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