Abstract
A previously discussed clockwork mechanism within heterotic M-theory is applied to its axion landscape. We identify a unique candidate for a QCD-axion with a decay constant in the preferred “axion window” around 1011 GeV. It is accompanied by at least one ultra-light axion that couples predominantly to hidden sector gauge groups.
Highlights
Observations of Planck and BICEP2, JCAP 03 (2015) 044 [arXiv:1403.5277] [INSPIRE]. [10] D.J.E
In the present paper we investigate the options for the QCD-axion as a solution to the strong CP-problem within a heterotic M-theory clockwork scheme, i.e. we explore the possibilities to obtain an axion decay constant within the allowed “axion window”, extending previous discussions of QCD-axions embedded in string theory [31]
The decay constant fa of the corresponding axion field should be inside the “axion window” around 1011 GeV
Summary
We will review the axion candidates under consideration. We shall identify and compare the candidates in the standard 10-dimensional heterotic string theory (weakly coupled case) with those in 11-dimensional heterotic M-theory (strongly coupled case).
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