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May 14, 2021 at 8:16 comment added anna v I think the difference at the quantum frame is that massless particles cannot form QM bound states, to be liable to the Pauli exclusion.
May 14, 2021 at 6:24 comment added Señor O Came here to say this same thing. What is "physical presence" exactly? Is it just the quality of existing in such a way that something else can't take up the same space as you? If so that's circular reasoning to then suggest it means mass = exclusion principle.
May 14, 2021 at 6:01 history answered rob CC BY-SA 4.0