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6 papers · 2 filters
Stringy Instantons and Yukawa Couplings in MSSM-like Orientifold Models
L. E. Ibanez, R. Richter
Type IIA orientifold constructions with intersecting D6-branes and their IIB duals in terms of magnetized D9/D7-branes constitute one of the most promising avenues for the construc…
D-brane instantons and matrix models
Iñaki García-Etxebarria
We point out that in some situations it is possible to use matrix model techniques a la Dijkgraaf-Vafa to perturbatively compute D-brane instanton effects. This provides an explana…
Two Higgs Pair Heterotic Vacua and Flavor-Changing Neutral Currents
Michael Ambroso, Volker Braun, Burt A. Ovrut
We present a vacuum of heterotic M-theory whose observable sector has the MSSM spectrum with the addition of one extra pair of Higgs-Higgs conjugate superfields. The quarks/leptons…
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…
D-Instanton Generated Dirac Neutrino Masses
Mirjam Cvetic, Paul Langacker
We present a stringy mechanism to generate Dirac neutrino masses by D-instantons in an experimentally relevant mass scale without fine-tuning. Within Type IIA string theory with in…
(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…