James Barham, the general editor of TheBestSchools.org, has written an intelligent, but accessible, critique of Lawrence Krauss’s book A Universe from Nothing (Free Press, 2012). Barham earned a B.A. in Classics from the University of Texas at Austin, an M.A. in the history of science from Harvard University, and a Ph.D. in the history and philosophy of science from the University of Notre Dame. His professional training equips him to see through Krauss’s book-length bluff about the multiverse (alleged infinity of universes).  I have also written on the multiverse here.

After an introduction, Barham says this:

Lawrence Krauss's … [book] is basically a superior and accessible rehashing of the concept of the "landscape." Also known as the "multiverse," that is the idea that our universe is embedded within an ensemble of other universes. Though according to this hypothesis our universe is a "part" of the landscape in some sense, it has no spacetime connection with any of the other universes. This means that they can have no causal influence on us, or we on them. That makes it tough to gather evidence that these other universes actually exist -- but let that pass. I won't go into the details of the arguments for and against the landscape hypothesis here. There is no lack of popular books covering this material … read more.