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Axion clockworks from heterotic M-theory: the QCD-axion and its ultra-light companion

Published 27 Jun 2019 in hep-th and hep-ph | (1906.11851v2)

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 $10{11}\,$GeV. It is accompanied by at least one ultra-light axion that couples predominantly to hidden sector gauge groups.

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