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A Non-perturbative Description of the Gimon-Polchinski Orientifold
Ashoke Sen
A T-dual version of the Gimon-Polchinski orientifold can be described by a configuration of intersecting Dirichlet seven branes and orientifold seven planes in the classical limit.…
Unification of String Dualities
Ashoke Sen
We argue that all conjectured dualities involving various string, M- and F- theory compactifications can be `derived' from the conjectured duality between type I and SO(32) heterot…
BPS States on a Three Brane Probe
Ashoke Sen
Recently Banks, Douglas and Seiberg have shown that the world volume theory of a three brane of the type IIB theory in the presence of a configuration of four Dirichlet seven brane…
F-theory and Orientifolds
Ashoke Sen
By analyzing -theory on near the orbifold limit of we establish the equivalence between -theory on and an orientifold of type IIB on , which in turn, is r…
Duality and Orbifolds
Ashoke Sen
We construct several examples where duality transformation commutes with the orbifolding procedure even when the orbifolding group does not act freely, and there are massless state…
Orbifolds of M-Theory and String Theory
Ashoke Sen
It is shown that many of the conjectured dualities involving orbifold compactification of M-theory follow from the known dualities involving M-theory and string theory in ten dimen…