25 of 29 people found the following review helpful
Lucid and enjoyable,
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This review is from: The Grand Design: New Answers to the Ultimate Questions of Life (Hardcover)
"Philosophy is dead", Hawking and Mlodinow proclaim on the first page, ending the book by stating that, if M-theory is confirmed by observation, "We will have found the grand design."
M-theory turns out to say that we actually live in a ten-dimensional universe (plus time), but we don't notice the extra seven dimensions of space because they are curled up into an infintesimally small size. They precise way they are curled up defines the laws of nature, or at least the laws the govern sub-atomic particles out of which everything else is constructed. There are, it seems, 10 to the power of 500 ways that this could have happened - in other words, a nearly infinite number of possible universes with different laws of nature to ours.
The authors point out that the laws of nature seem to be tuned incredibly precisely to allow life to exist. Tweak them every so slightly, and there might not even be suns and planets, let alone living things. So the vast majority of those different universes would be uninhabitable.
There are two ways you can react to this. One is to declare it as open and shut evidence of God. That is not Hawking and Mlodinow's view. Instead, they follow the idea that in some absolute sense all these possible universes "exist". Quantum theory suggests that what we think of as reality is the result of observation. Without observation, all possibilities exist equally. By being here, by observing, we selected one of the very few universes that could have given rise to us.
This is a lucidly written book, not over long, nicely illustrated with some witty cartoons and sprinkled with impish humour. Books about cosmology and quantum theory are never going to be easy for the general reader, but Hawking and Leonard Mlodinow do a creditable job.
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Initial post: 20 Sep 2010 17:27:39 BDT
thanks for this super review. You have given a really good overview
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