We examine the T-duality relation between 1+ 1 NCOS and the DLCQ limit of type-IIA string
theory. We show that, as long as there is a compact dimension, one can meaningfully define …

A bstract We investigate how SL (2, ℤ) duality is realized in nonrelativistic type IIB
superstring theory, which is a self-contained corner of relativistic string theory. Within this …

We review the general theory of duality rotations which, in four dimensions, exchange
electric with magnetic fields. Necessary and sufficient conditions in order for a theory to have …

We examine noncommutative Yang-Mills and open string theories using magnetically and
electrically deformed supergravity duals. The duals are near horizon regions of Dp-brane …

We study noncommutative open string (NCOS) theories realized in string theory with time-
dependent backgrounds. Starting from a noncommutative Yang–Mills theory (NCYM) with a …

We construct dual supergravity descriptions of field theories and little string theories with
light-like non-commutativity. The field theories are realized on the world-volume of Dp …

We show that combining the spatial noncommutative SYM limit and Lorentz transformation,
one can obtain a well-behaved light-like noncommutative SYM limit. The light-like …

After reviewing the supertubes and super brane-antibrane systems in the context of matrix
model, we look for more general higher-dimensional configurations. For D3-, we find a non …

Recently we studied 'vanishing'horizon limits of 'boosted'black D3-brane geometry [1]. The
type IIB solutions obtained by taking these special double limits were found to describe …

We show that noncommutative electromagnetism and Dirac–Born–Infeld (DBI) theory with
scalar fields are SL (2, R) self-dual when noncommutativity is light-like and we are in the …