Single graviton loop contribution to the self-mass of a massless, conformally coupled scalar on a de Sitter background

We use a simplified formalism to recompute the single graviton loop contribution to the self-mass of a massless, conformally coupled scalar on de Sitter background which was originally made by Boran et al., [Phys. Rev. D 90, 124054 (2014); 96, 025001 (2017); 96, 105003 (2017)]. Our result resolves the problem with the flat space correspondence limit that was pointed out by Frob [Classical Quantum Gravity 35, 035005 (2018)]. We discuss how this computation will be used in a long-term project to purge the linearized effective field equation of gauge dependence.