Axions In String Theory
High Energy Physics - Theory
2010-04-07 v2 Astrophysics
High Energy Physics - Phenomenology
Abstract
In the context of string theory, axions appear to provide the most plausible solution of the strong CP problem. However, as has been known for a long time, in many string-based models, the axion coupling parameter F_a is several orders of magnitude higher than the standard cosmological bounds. We re-examine this problem in a variety of models, showing that F_a is close to the GUT scale or above in many models that have GUT-like phenomenology, as well as some that do not. On the other hand, in some models with Standard Model gauge fields supported on vanishing cycles, it is possible for F_a to be well below the GUT scale.
Keywords
Cite
@article{arxiv.hep-th/0605206,
title = {Axions In String Theory},
author = {Peter Svrcek and Edward Witten},
journal= {arXiv preprint arXiv:hep-th/0605206},
year = {2010}
}
Comments
62 pages, v2; references, acknowledgements and minor corrections added