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7 papers · 2 filters
Open Descendents of U(2N) Orbifolds at Rational Radii
A. N. Schellekens, N. Sousa
We construct explicitly the open descendants of some exceptional automorphism invariants of U(2N) orbifolds. We focus on the case N=pq, p and q prime, and on the automorphisms of t…
Dynamical Topology Change in M Theory
Brian R. Greene, Koenraad Schalm, Gary Shiu
We study topology change in M theory compactifications on Calabi-Yau three-folds in the presence of G flux (the four form field strength). In particular, we discuss vacuum solution…
Construction and analysis of anomaly-free supersymmetric SO(2N)/U(N) sigma-models
S. Groot Nibbelink, T. S. Nyawelo, J. W. van Holten
This paper discusses a procedure for the consistent coupling of gauge- and matter superfields to supersymmetric sigma-models on symmetric coset spaces of Kaehler type. We exhibit t…
Boundaries, crosscaps and simple currents
J. Fuchs, L. R. Huiszoon, A. N. Schellekens +2
Universal formulas for the boundary and crosscap coefficients are presented, which are valid for all symmetric simple current modifications of the charge conjugation invariant of a…
Warped Compactifications in M and F Theory
Brian R. Greene, Koenraad Schalm, Gary Shiu
We study M and F theory compactifications on Calabi-Yau four-folds in the presence of non-trivial background flux. The geometry is warped and belongs to the class of p-brane metric…
Crosscaps, Boundaries and T-Duality
L. R. Huiszoon, A. N. Schellekens
Open descendants with boundaries and crosscaps of non-trivial automorphism type are studied. We focus on the case where the bulk symmetry is broken to a Z_2 orbifold subalgebra. By…