Effective scalaron-photon coupling in f(R) gravity vanishes in the light-scalaron limit due to cancellation of anomaly-induced and diagrammatic contributions.
Kamada,On scalaron decay via the trace of energy-momentum tensor,JHEP07 (2019) 172 [1902.05209]
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Generalized no-scale models with R=2/(3α) for α≠1 or non-minimal gauge couplings allow unsuppressed inflaton decays, producing calculable reheating temperatures and (n_s,r) predictions.
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Effective scalaron--photon interaction in $f(R)$ gravity
Effective scalaron-photon coupling in f(R) gravity vanishes in the light-scalaron limit due to cancellation of anomaly-induced and diagrammatic contributions.