Stenger says:-
"The “nothing” that Krauss mainly talks about throughout the book is, in fact, precisely definable. It should perhaps be better termed as a “void,” which is what you get when you apply quantum theory to space-time itself. It’s about as nothing as nothing can be. This void can be described mathematically. It has an explicit wave function. This void is the quantum gravity equivalent of the quantum vacuum in quantum field theory."
"Krauss also describes how cosmology now strongly suggests that a “multiverse” exists in which our universe is just one member. So, the real issue is not where our particular universe came from but where the multiverse came from. This question has an easy answer: the multiverse is eternal. So, since it always was, it didn’t have to come from anything."
"Albert is not satisfied that Krauss has answered the fundamental question: Why there is something rather than nothing, that is, being rather than nonbeing? Again, there is a simple retort: Why should nothing, no matter how defined, be the default state of existence rather than something? And, to bring religion into the picture, one could ask: Why is there God rather than nothing? Once theologians assert that there is a God (as opposed to nothing), they can’t turn around and ask a cosmologist why there is a universe (as opposed to nothing). They claim God is a necessary entity. But then, why can’t a godless multiverse be a necessary entity?"
Now, one might still ask why there is something rather than nothing, where nothing means nonbeing including the absence of God. Here at least we can provide a suggestion based on our knowledge of the quantum void. As Nobel laureate Frank Wilczek put it in a Scientific American article back in 1980, which Krauss quotes, “Nothing is unstable.”[7]
The issues Albert raises are legitimate, but they can be addressed within existing physics and philosophical knowledge."
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