New String Theories in Six Dimensions via Branes at Orbifold Singularities

Abstract

We present several classes of new 6d string theories which arise via branes at orbifold singularities. They have compact moduli spaces, associated with tensor multiplets, given by Weyl alcoves of non-Abelian groups. We discuss T-duality and Matrix model applications upon compactification.

arXiv comment11 pages, harvmac. Added footnote on E_8 5-branes at D_n singularities

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