Question: Theoretical physicists often assert that at the extremely high energies thought to have existed in the first moments of the universe, the W particle (which

Theoretical physicists often assert that at the extremely high energies thought to have existed in the first moments of the universe, the W particle (which is known to have a mass several hundred times that of the proton) would behave, mass-wise, similarly to the (massless) photon. Explain this apparently contradictory statement.

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