Axions in String Theory

Technical Report · Fri Jun 09 00:00:00 EDT 2006

DOI:https://doi.org/10.2172/883239· OSTI ID:883239

Svrcek, Peter; Witten, Edward

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 Fa 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.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 883239
• Report Number(s): SLAC-PUB-11894; hep-th/0605206; TRN: US200615%%40
• Country of Publication: United States
• Language: English

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