Project

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Quasi realistic string models with stabilized moduli and applications to cosmology

Applicant Timirgaziu Maria-Cristina
Number 134157
Funding scheme Marie Heim-Voegtlin grants
Research institution Institut für Theoretische Physik Universität Bern
Institution of higher education University of Berne - BE
Main discipline Theoretical Physics
Start/End 01.02.2011 - 30.09.2014
Approved amount 244'121.00
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Keywords (3)

string phenomenology; moduli stabilization; asymmetric orbifolds

Lay Summary (English)

Lead
Lay summary

Moduli stabilization is an important challenge in string phenomenology. We are searching for heterotic string models with few or no moduli in the context of asymmetric Z2 x Z2 orbifolds. The goal is to obtain semi-realistic models with as few as possible moduli. The models are built using free fermions and we took inspiration from the semi-realistic class of NAHE models. Mathematica programs are used to scan large numbers of models, in parallel with building models by hand to gain intuition and identify criteria for distinguishing in-equivalent cases. The models are progressively improved by adding technically more involved features, such as complex twists and shifts. Flat directions will be systematically investigated in the interesting models obtained from the scan. A parallel can be drawn in some cases to type II string models, via the so called Gepner map.

Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Heterotic T-folds with a small number of neutral moduli
Bianchi Massimo, Pradisi Gianfranco, Timirgaziu Cristina, Tripodi Luca (2012), Heterotic T-folds with a small number of neutral moduli, in Journal of High Energy Physics, 2012(10), 1-36.

Collaboration

Group / person Country
Types of collaboration
INFN, Rome Tor Vergata Italy (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication

Abstract

Moduli stabilization is an important challenge in string phenomenology. We are going to search for heterotic models with few or no moduli in the context of asymmetric Z2 x Z2 orbifolds. The models are built using free fermions. A Mathematica scan will be performed and flat directions will be systematically investigated in the interesting models obtained from the scan. In the context of Type I orientifolds a first step towards moduli stabilization is to consider rigid branes intersecting models. It is of great interest to address cosmological questions in the framework of quasi-realistic models obtained in this way.
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