Kalam

[LinuxGal]

Penrose's problem is that he requires the far-future universe to consist solely of photons to make the conformal scaling work, but any particles with mass, such as protons, have an innate Compton wavelength based on their rest mass that doesn't scale.  And as far as we know protons do not decay.

Well, please don't tell the Nobel committee this.

Uh, Penrose got his Nobel Prize for his theorem that singularities are a prediction of General Relativity.  Cyclic cosmology is a side hobby.