A Theoretical Review of Axion
arXiv:astro-ph/0002193 · doi:10.1142/9789812792129_0007
Abstract
It is emphasized that the existence of a very light axion is consistent with the strong CP invariance and cosmological and astrophysical constraints. The attempt to embed the very light axion in superstring models is discussed.
arXiv comment11 pages including 3 eps figures