397 citations · 649 across the 4 of their papers we have counts for
4 papers · 1 filter
Retrofitting and the mu Problem
Daniel Green, Timo Weigand
One of the challenges of supersymmetry (SUSY) breaking and mediation is generating a mu term consistent with the requirements of electro-weak symmetry breaking. The most common app…
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…
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…
Spacetime Instanton Corrections in 4D String Vacua - The Seesaw Mechanism for D-Brane Models
Ralph Blumenhagen, Mirjam Cvetic, Timo Weigand
We systematically investigate instanton corrections from wrapped Euclidean D-branes to the matter field superpotential of various classes of N=1 supersymmetric D-brane models in fo…