From Physicist George Ellis who co-wrote a book with Stephen Hawking answering the question can Lawrence Krauss answer why there is something instead of nothing
Certainly not. He is presenting untested speculative theories of how things came into existence out of a pre-existing complex of entities, including variational principles, quantum field theory, specific symmetry groups, a bubbling vacuum, all the components of the standard model of particle physics, and so on. He does not explain in what way these entities could have pre-existed the coming into being of the universe, why they should have existed at all, or why they should have had the form they did. And he gives no experimental or observational process whereby we could test these vivid speculations of the supposed universe-generation mechanism. How indeed can you test what existed before the universe existed? You can’t.
Thus what he is presenting is not tested science. It’s a philosophical speculation, which he apparently believes is so compelling he does not have to give any specification of evidence that would confirm it is true. Well, you can’t get any evidence about what existed before space and time came into being. Above all he believes that these mathematically based speculations solve thousand year old philosophical conundrums, without seriously engaging those philosophical issues. The belief that all of reality can be fully comprehended in terms of physics and the equations of physics is a fantasy. As pointed out so well by Eddington in his Gifford lectures, they are partial and incomplete representations of physical, biological, psychological, and social reality.
And above all Krauss does not address why the laws of physics exist, why they have the form they have, or in what kind of manifestation they existed before the universe existed (which he must believe if he believes they brought the universe into existence). Who or what dreamt up symmetry principles, Lagrangians, specific symmetry groups, gauge theories, and so on? He does not begin to answer these questions. It’s very ironic when he says philosophy is bunk and then himself engages in this kind of attempt at philosophy.
From Scientific American
"...When I mentioned Ellis’s critique to Krauss, he claimed that Ellis, although once a physicist, is now a “theologian.” Ellis, a Quaker, has indeed written about religion, among other topics, but he is renowned for his work as a physicist. He co-wrote with Stephen Hawking the classic work The Large-Scale Structure of Spacetime, published in 1973. Just in the past five years, Ellis, now 76, has edited one book on quantum gravity and co-written another on cosmology and has co-written more than a dozen papers on physics, according to his website..."
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