256 citations · 2.4k across the 48 of their papers we have counts for
48 papers
Type II String Theory on Calabi-Yau Manifolds with Torsion and Non-Abelian Discrete Gauge Symmetries
Volker Braun, Mirjam Cvetic, Ron Donagi +1
We provide the first explicit example of Type IIB string theory compactification on a globally defined Calabi-Yau threefold with torsion which results in a four-dimensional effecti…
Two One-Parameter Special Geometries
Volker Braun, Philip Candelas, Xenia de la Ossa
The special geometries of two recently discovered Calabi-Yau threefolds with are analyzed in detail. These correspond to the 'minimal three-generation' manifolds with $h…
Complete Intersection Fibers in F-Theory
Volker Braun, Thomas W. Grimm, Jan Keitel
Global F-theory compactifications whose fibers are realized as complete intersections form a richer set of models than just hypersurfaces. The detailed study of the physics associa…
F-theory on Genus-One Fibrations
Volker Braun, David R. Morrison
We argue that M-theory compactified on an arbitrary genus-one fibration, that is, an elliptic fibration which need not have a section, always has an F-theory limit when the area of…
Geometric Engineering in Toric F-Theory and GUTs with U(1) Gauge Factors
Volker Braun, Thomas W. Grimm, Jan Keitel
An algorithm to systematically construct all Calabi-Yau elliptic fibrations realized as hypersurfaces in a toric ambient space for a given base and gauge group is described. This g…
New Global F-theory GUTs with U(1) symmetries
Volker Braun, Thomas W. Grimm, Jan Keitel
We construct global F-theory GUTs with SU(5) x U(1) gauge group defined by specifying a fully resolved Calabi-Yau fourfold and consistent four-form G-flux. Its specific U(1) charge…