According to my research on the Standard Model, gravitation is mediated by a massless graviton with spin 2.
Upon examining the unity of comparison between cosmic time and quantum unification listed in reference 1, the unification of two forces is scaled at the rest mass (energy) of their bosons respectively, except the photon which is massless and unifies at the photon rest energy.
However, upon examining the chart provided in reference 1, the boson for TOE unification is a 'Planck Boson' at the Planck singularity rest mass (energy). According to my limited understanding of the Standard Model, a Planck mass is not a member of the particle family. For example, colliding any two particles in the SM particle family at any energy scale will not result in the production of a Planck mass Boson and there is no known Feynman diagram for such a reaction.
According to my understanding of General Relativity, the Planck mass is the gravitational Boson, however, according to the Standard Model, the graviton is the gravitational Boson.
My question is, have physicists seriously considered the possibility that even though the fine structure interaction strengths are the same for General Relativity and the Standard Model at Planck scale energies, they do not unify at Planck scale energies with a massless graviton Boson, but continue to exist as different entities within their own equation of states?
If this statement is true, then gravitons do not exist.
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