Abstract
Abstract Many low-energy superstring models contain a pseudo-anomalous U (1) as a global symmetry. We investigate the possibility of having the ensuing axion solve the strong CP problem. We conclude that in heterotic strings with non-abelian hidden gauge groups, this axion cannot solve the strong CP problem. We also comment on alternative solutions to the strong CP puzzle in strings, based on approximate global symmetries of the low-energy lagrangian. We point out potential problems this mechanism would face when applied to realistic models. We find the massless up quark solution to the strong CP problem quite satisfactory. As an example, we work out all the details behind our general remarks for the flipped SU (5) × U (1) model. Previous studies of the hierarchical fermion mass spectrum in this model offer substantial support to our proposed solution to the puzzle.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
