A mixed F- and D-term uplift in supergravity evades the Planckian lower bound on the R-axion decay constant, allowing it to be the QCD axion and dark matter.
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An Intermediate Scale R-axion \& the QCD Axion
A mixed F- and D-term uplift in supergravity evades the Planckian lower bound on the R-axion decay constant, allowing it to be the QCD axion and dark matter.