Axions in string theory

Peter Svrček, Edward Witten

Research output: Contribution to journalArticlepeer-review

1027 Scopus citations


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 Fa 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 Fa to be well below the GUT scale.

Original languageEnglish (US)
Article number051
JournalJournal of High Energy Physics
Issue number6
StatePublished - Jul 1 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


  • QCD
  • Superstring Vacua


Dive into the research topics of 'Axions in string theory'. Together they form a unique fingerprint.

Cite this