The mass of an object increases as a function of its velocity, I forget the exact equation, but it's elementary physics. Therefore, once even an elementary particle, such as an electron or baryon, nears the speed of light, there must a point where it falls inside its own event horizon, and it should become a tiny Black Hole. Those conditions surely existed at the time of the Big Bang. Why doesn't / didn't that happen? I presume that this is not a problem for massless particles such a photons.