397 citations · 5.9k across the 82 of their papers we have counts for
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GUTs in Type IIB Orientifold Compactifications
Ralph Blumenhagen, Volker Braun, Thomas W. Grimm +1
We systematically analyse globally consistent SU(5) GUT models on intersecting D7-branes in genuine Calabi-Yau orientifolds with O3- and O7-planes. Beyond the well-known tadpole an…
A string theoretic model of gauge mediated supersymmetry beaking
Mirjam Cvetic, Timo Weigand
We propose a robust supergravity model of dynamical supersymmetry breaking and gauge mediation, and a natural embedding in non-perturbative string theory with D-branes. A chiral fi…
Comments on Orientifolds without Vector Structure
Constantin Bachas, Massimo Bianchi, Ralph Blumenhagen +2
We revisit type I compactifications with a Spin(32)/Z2 gauge bundle that admits no vector structure. We elucidate the relation of this Z2 obstruction to discrete B-field flux and t…
(Non-)BPS bound states and D-brane instantons
Mirjam Cvetic, Robert Richter, Timo Weigand
We study non-perturbative effects in four-dimensional N=1 supersymmetric orientifold compactifications due to D-brane instantons which are generically not invariant under the orien…