Axion-like Particles from String Compactifications
High Energy Physics - Theory
2013-09-27 v1 High Energy Physics - Phenomenology
Abstract
We review how axion-like particles (ALPs) naturally emerge in the low-energy effective field theory of string compactifications. We focus on the study of their mass spectrum and couplings, stressing that they depend on the mechanism used to fix the moduli. We present concrete examples where either open or closed string modes behave as QCD axions which do not overproduce cold dark matter. Relativistic ALPs can also be produced by the decay of the lightest modulus which drives reheating. These ALPs contribute to dark radiation and could be detected via axion-photon conversion in astrophysical magnetic fields.
Keywords
Cite
@article{arxiv.1309.6988,
title = {Axion-like Particles from String Compactifications},
author = {Michele Cicoli},
journal= {arXiv preprint arXiv:1309.6988},
year = {2013}
}
Comments
8 pages; Contributed to the 9th Patras Workshop on Axions, WIMPs and WISPs, Mainz, June 24-28, 2013