Some items from around the multiverse:
It is no surprise that information about us is required to make predictions for our observations. Our data suggest that we are located some 13.7Gyr from a Big Bang. To make a reliable prediction from that information, we have to assume that it describes our physical situation. If the universe is rife with delusion, we must assume that we are atypical in order to have predictive and testable scientific theories. Indeed, it is only by making such assumptions that we are able to do science in a very large universe. We imagine that even Copernicus would have agreed that it was necessary to assume that Ptolemy was not deluded in his observations of the planets.
The authors thank about a dozen or so other theorists for their help with this.
Update: For a more skeptical and philosophical take on the multiverse, there’s The Unique Universe, a piece by Lee Smolin that just came out in the latest Physics World.
Update: The proceedings of the Wheaton College conference on string theory, the Multiverse and theology are available here. They include audio recordings of the discussions, and inform us that string theory
implies that physical reality is far vaster and possesses greater grandeur than ever imagined.