A cancellation between two gravity-induced couplings lets the scalaron act as cold dark matter with a mass between about 1.4 keV and 0.7 MeV.
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In the Jordan-frame treatment of f(R) gravity the scalaron-photon effective coupling vanishes for m much less than loop-particle masses because the classical-trace diagrams cancel the Fujikawa anomaly term.
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Scalaron dark matter dynamics: effects of Higgs non-minimal coupling to gravity
A cancellation between two gravity-induced couplings lets the scalaron act as cold dark matter with a mass between about 1.4 keV and 0.7 MeV.
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Effective scalaron--photon interaction in $f(R)$ gravity
In the Jordan-frame treatment of f(R) gravity the scalaron-photon effective coupling vanishes for m much less than loop-particle masses because the classical-trace diagrams cancel the Fujikawa anomaly term.