[kgwgk]

> The article explores the idea that pure kinetic energy in form of photons indeed might have at least gravity-like properties.

Saying “explore”, “idea”, “might” makes it sound as if this was not a well-established 100-years-old theory.

> My presumption is that atoms are somehow made of really high energy EM fields so that they appear to be massive.

Somehow... The easiest way to proceed in that program of research may be to rename the standard model as ElectroMagnetism and try to get a unified theory of the strong, weak and the-force-previously-known-as-em forces. Then you unify that with GR and you’re done :-)

[JadeNB]

> The easiest way to proceed in that program of research may be to rename the standard model as ElectroMagnetism and try to get a unified theory of the strong, weak and the-force-previously-known-as-em forces.

Certainly the unification of electromagnetism + the weak force is understood, and there is a theory (or several theories) about electroweak + strong unification: https://en.wikipedia.org/wiki/Grand_Unified_Theory .

[kgwgk]

That links says: “Unsolved problem in physics: Are the three forces of the Standard Model unified at high energies?”

But we may be close, for some values of close :-)

[JadeNB]

> That links says: “Unsolved problem in physics: Are the three forces of the Standard Model unified at high energies?”

Indeed, that's why I said only that there were theories about it.

[kgwgk]

Sure, but the solutions to the solved problems in physics are also called "theories". I'm sure you knew the GUT is not yet done, it was just a clarification.

[JadeNB]

I always appreciate non-shouty clarifications of misunderstandings, combined with charitable interpretations of others' motives and knowledge. Thank you!