
Thus, this mass–energy relation states that the universal proportionality factor between equivalent amounts of energy and mass is equal to the speed of light squared.
With this in mind given that we know that the constant of the speed of light is governed by two celestials bodies, a sun in which a light photon is created in of which the initial speed of light develops and then the black hole of which is the only known celestial body capable of trapping the light photon and not allowing it to escape.
Since both of these celestial bodies would not be present prior to the Big Bang how would the governance of mass-energy relation be formulated?
Since light photons existed only after the Big Bang occurred E=MC^2 would not have been present until afterwards.