the actual paper https://www.nature.com/articles/s41467-026-69070-3
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Photons do have energy (in the stress-energy tensor), so they curve spacetime too, but all particles follow geodesics regardless of mass...so...I guess it is all the same from gravity's PoV...it is QM that makes a difference...but entanglement doesn't either (like gravity)...wink wink, nudge nudge...
PS: ok, ok, radiation's energy density is 1/a⁴ and baryons is 1/a³, so there is a distinction there to having inertia towards gravity.