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Enhanced Gauge Symmetry in M(atrix) Theory
Michael R. Douglas
We discuss the origin of enhanced gauge symmetry in ALE (and K3) compactification of M theory, either defined as the strong coupling limit of the type IIa superstring, or as define…
Probing F-theory With Multiple Branes
Michael R. Douglas, David A. Lowe, John H. Schwarz
We study multiple 3-branes on an F theory orientifold. The world-volume theory of the 3-branes is d=4, N=2 Sp(2k) gauge theory with an antisymmetric tensor and four flavors of matt…
Five-branes in M(atrix) Theory
Micha Berkooz, Michael R. Douglas
We propose a construction of five-branes which fill both light-cone dimensions in Banks, Fischler, Shenker and Susskind's matrix model of M theory. We argue that they have the corr…
Superstring Dualities, Dirichlet Branes and the Small Scale Structure of Space
Michael R. Douglas
We give a broad overview of superstring duality, Dirichlet branes, and some implications of both for questions about the structure of space-time at short distances.
Small Instantons, del Pezzo Surfaces and Type I' theory
M. R. Douglas, S. Katz, C. Vafa
Small instantons of exceptional groups arise geometrically by a collapsing del Pezzo surface in a CY. We use this to explain the physics of a 4-brane probe in Type I' compactificat…
D-branes and Short Distances in String Theory
Michael R. Douglas, Daniel Kabat, Philippe Pouliot +1
We study the behavior of D-branes at distances far shorter than the string length scale~. We argue that short-distance phenomena are described by the IR behavior of the D-bran…