Brian Greene: Back to blow your mind.
Having explained string theory to the masses in his bestseller The Elegant Universe and untangled the fabric of the cosmos in The Fabric of the Cosmos, the superstar physicist returns this month with The Hidden Reality, an ode to multiverse theory.
By now, the 11-dimension string theory models of his earlier books … are looking downright commonsensical. “The Hidden Reality” moves on to increasingly speculative and exotic discussions of a bubble multiverse (“Think of the universe as a gigantic block of Swiss cheese. …”) a holographic one, a brane-world scenario (courtesy of string theory), computer-driven simulations, questions of how probability relates to infinity, and the Many Worlds view of quantum mechanics. “A frequent criticism of the Many Worlds approach is that it’s just too baroque to be true,” Mr. Greene writes. [The New York Times]
Multiverse theory—the idea that our universe and its Big Bang were just one of many—is a favorite theme of science fiction (and “Family Guy”), as it allows us to have parallel selves in parallel universes. Greene explains the real science behind the idea with one of his litany of analogies: a simple deck of cards.
If you shuffle the deck infinitely many times, the card orderings must necessarily repeat. Similarly, in an infinite expanse of space, particle arrangements must repeat too—there just aren’t enough different particle configurations to go around. And if the particles in a given region of space the size of ours are arranged identically to how they are arranged here, then reality in that region will be identical to reality here. Except that maybe we’d be seeing the Jets and the Bears in the Super Bowl. [Wall Street Journal]
Physicist Sean Carroll, one of the people behind Cosmic Variance here at DISCOVER blogs, tweeted yesterday: “I think Stephen Hawking could say ‘ice cream is delicious’ and get massive media coverage.” He’s probably right.
Last month the renowned physicists made the news by warning of the great threat of human extinction over the next couple centuries, but kindly softened the blow by saying that we’ll be fine if we can get through our growing pains and get off this planet. Back in April, the wave of attention came from his warning that it might not be such a great idea to attempt to contact aliens, should they be more advanced than us and try to wipe us out.
Now, he’s taking on the almighty. Hawking’s new book, The Grand Design, co-authored by Leonard Mlodinow, snagged media attention this week because of an excerpt that appeared in the U.K.’s The Times (which we can’t link to, because it’s behind an online pay wall).
“Spontaneous creation is the reason why there is something rather than nothing, why the universe exists, why we exist,” he wrote. “It is not necessary to invoke God to light the blue touch paper [fuse] and set the universe going.” [CNN]
Or, to put it another way, here’s a bit from the book’s final chapter about the nature of the universe: