Tryon then goes on to describe how our universe could have come from a quantum fluctuation of the vacuum. He does this by simply applying our current scientific laws such as quantum mechanics and quantum field theory which exist in our universe, to that era before our universe was here. Like many physicists he believes that a vacuum, or empty space, existed before our universe existed. According to physics, because of quantum mechanics and quantum field theory, every vacuum has something in it. At the quantum level, because of the uncertainty principle, the law of the conservation of energy can be broken for just a brief moment, causing virtual particles to pop in and out of existence. Tryon says virtual particles also existed in the vacuum that was here before our universe existed, and these quantum fluctuations from nothing (the vacuum) eventually led to one of these particles popping into existence and becoming our universe.