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Bound States of D(2p)-D0 Systems and Supersymmetric p-Cycles
Ralph Blumenhagen, Volker Braun, Robert Helling
We discuss some issues related to D(2p)-D0 branes with background magnetic fluxes respectively, in a T-dual picture, Dp-Dp branes at angles. In particular, we describe the nature o…
Type I Strings with F- and B-Flux
Ralph Blumenhagen, Boris Kors, Dieter Lust
We present non-supersymmetric toroidal compactifications of type I string theory with both constant background NSNS two-form flux and non-trivial magnetic flux on the various D9-br…
Dilaton Tadpoles, Warped Geometries and Large Extra Dimensions for Non-Supersymmetric Strings
Ralph Blumenhagen, Anamaria Font
We analyze the backreaction of dilaton tadpoles on the geometry of non-supersymmetric strings. After finding explicit warped solutions for a T-dual version of the Sugimoto model, w…
Magnetic Flux in Toroidal Type I Compactification
Ralph Blumenhagen, Lars Goerlich, Boris Kors +1
We discuss the compactification of type I strings on a torus with additional background gauge flux on the D9-branes. The solutions to the cancellation of the RR tadpoles display va…
Asymmetric Orientifolds, Brane Supersymmetry Breaking and Non-BPS Branes
Carlo Angelantonj, Ralph Blumenhagen, Matthias R. Gaberdiel
A new class of six-dimensional asymmetric orientifolds is considered where the orientifold operation is combined with T-duality. The models are supersymmetric in the bulk, but the…
Noncommutative Compactifications of Type I Strings on Tori with Magnetic Background Flux
Ralph Blumenhagen, Lars Goerlich, Boris Kors +1
We construct six- and four-dimensional toroidal compactifications of the Type I string with magnetic flux on the D-branes. The open strings in this background probe a noncommutativ…