Axions in String Theory

Svrcek, Peter ; /Stanford U., Phys. Dept. /SLAC ; Witten, Edward ; /Princeton, Inst. Advanced Study

Stanford Linear Accelerator Center

关键词: Stanford Linear Accelerator Center Theory-Hep,Hepth;    Standard Model;    Theory-Hep,Hepth;    72 Physics Of Elementary Particles And Fields;    Axions;   

DOI  :  10.2172/883239
RP-ID  :  SLAC-PUB-11894
RP-ID  :  AC02-76SF00515
RP-ID  :  883239

美国|英语

来源: UNT Digital Library

【 摘 要 】

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.