Continuing from yesterday’s post, I said that some religious people think that since there is matter in the universe that did not exist before the universe came into being, this must constitute a violation of scientific laws and thus requires some agency to create it. But they do not understand that energy comes in many different forms and that they all have to be included in the calculation. The fact is that despite all the matter that exists in the universe, the net energy of the universe is zero because the positive energy in the matter is canceled by the negative gravitational potential energy. So the appearance of an entire universe out of nothing need not violate the law of conservation of energy or any other law. Hence unless expressly forbidden by an as yet unknown law, there is nothing to prevent a vast, even possibly infinite, number of universes to have been created and exist simultaneously with ours, each with its own space-time and laws and matter distinct from ours.
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