What would be the cause of the initial state of non-existence?
Leon Lederman explains:
"In the very beginning, there was a void, a curious form of vacuum, a nothingness containing no space, no time, no matter, no light, no sound. Yet the laws of nature were in place and this curious vacuum held potential. A story logically begins at the beginning, but this story is about the universe and unfortunately there are no data for the very beginnings--none, zero. We don't know anything about the universe until it reaches the mature age of a billion of a trillionth of a second. That is, some very short time after creation in the big bang. When you read or hear anything about the birth of the universe, someone is making it up--we are in the realm of philosophy. Only God knows what happened at the very beginning."
Leon Lederman, American experimental physicist and Nobel Laureate