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- Oleg Lebedev, Hans Peter Nilles, Stuart Raby, Saúl Ramos-Sánchez, Michael Ratz, Patrick K. S. Vaudrevange +1 other
- 2008

In a previous paper, referred to as a " Mini-Landscape " search, we explored a " fertile patch " of the heterotic landscape based on a 6-II orbifold with SO(10) and E 6 local GUT structures. In the present paper we extend this analysis. We find many models with the minimal supersymmetric standard model spectra and an exact R parity. In all of these models,… (More)

- Oleg Lebedev, Hans Peter Nilles, Stuart Raby, Saúl Ramos-Sánchez, Michael Ratz, Patrick K. S. Vaudrevange +1 other
- 2006

We explore a " fertile patch " of the heterotic landscape based on a 6-II orb-ifold with SO(10) and E 6 local GUT structures. We search for models allowing for the exact MSSM spectrum. Our result is that of order 100 out of a total 3 × 10 4 inequivalent models satisfy this requirement.

- Felix Plöger, Saúl Ramos-Sánchez, Michael Ratz, Patrick K. S. Vaudrevange
- 2007

N × M orbifold models admit the introduction of a discrete torsion phase. We find that models with discrete torsion have an alternative description in terms of torsionless models. More specifically, discrete torsion can be 'gauged away' by changing the shifts by lattice vectors. Similarly, a large class of the so-called generalized discrete torsion phases… (More)

We give a complete classification of Z N orbifold compactification of the heterotic SO(32) string theory and show its potential for realistic model building. The appearance of spinor representations of SO(2n) groups is analyzed in detail. We conclude that the heterotic SO(32) string constitutes an interesting part of the string landscape both in view of… (More)

- Takeshi Araki, Tatsuo Kobayashi, Jisuke Kubo, Saúl Ramos-Sánchez, Michael Ratz, Patrick K.S. Vaudrevange
- 2008

We derive anomaly constraints for Abelian and non-Abelian discrete symmetries using the path integral approach. We survey anomalies of discrete symmetries in heterotic orbifolds and find a new relation between such anomalies and the so-called 'anomalous' U(1).

The orbifolder is a program developed in C++ that computes and analyzes the low-energy effective theory of heterotic orbifold compactifications. The program includes routines to compute the massless spectrum, to identify the allowed couplings in the superpotential, to automatically generate large sets of orbifold models, to identify phenomenologically… (More)

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