For the first time, scientists have observed quantum entanglement in the momentum of massive particles. The result, decades in the making, could help physicists probe the relationship between quantum mechanics and gravity.
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.
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.