196 of 203 people found the following review helpful:
4.0 out of 5 stars
A designer world?, February 28, 2005
Michio Kaku's discussion of PARALLEL WORLDS results from physicists' attempts to reconcile Einstein's Theory of Relativity with that of quantum mechanics to form a "theory of everything." M-Theory, the newest form of string theory, allows for the possibility of a parallel universe no more than a millimeter from ours. Kaku believes the newest super collider, which should be ready in 2007, may reveal evidence pointing to this alternate universe.
Another theory, Alan Guth's inflationary universe theory, argues that the universe expanded much faster than the speed of light (possible because this was empty space that was expanding) and that the antigravity force which caused this original Big Bang still exists, allowing for more explosions, more inflation, and multi-universes.
Also, if we apply the quantum theory to the universe, we are forced to admit that the universe, like an electron, may exist simultaneously in many states.
Kaku asks the question, "What might these alternate universes look like?" Kaku theorizes that each time a new universe sprouts off from the original the physical laws change, creating entirely new realities. All of this gets even stranger when Kaku projects that all possible quantum worlds might exist simultaneously.
The author does not shy away from controversial issues, such as the Designer Universe. At one point he compares the likelihood of our world occurring by accident to a "Boeing 747 aircraft being completely assembled as a result of a tornado striking a junkyard."
PARALLEL WORLDS really gets interesting when Kaku discusses Nikolai Kardashev's classification of civilizations according to energy output. Type I would have harnessed planetary forms of energy. Type II would be able to consume the energy output of its star and might even be able to ignite neutron stars. Type III has colonized large portions of its home galaxy and is able to use the energy from ten billion stars. Earth is a rather primitive civilization in contrast. Kaku states that if we reach Type I civilization it may launch a time of "unparalleled peace and prosperity." But that's a big if, considering the greenhouse effect, pollutin, nuclear war, fundamentalism and disease.
Kaku ends his book with a theological discussion of sorts. "If all possible universes exist, what's the point?" he asks. In a quantum universe, parallel selves would exist in parallel universes, with "different life histories and different destinies." Kaku believes that if string theory is eventually confirmed, providing a theory of everything, one must ask where the equation came from.
The author ends on a high note, seeing this as the most momentous time in human history, a time of transition to a type I civilization, a true paradise on Earth, if we can overcome our self-destructive natures.
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130 of 133 people found the following review helpful:
5.0 out of 5 stars
Current cosmology for a lay audience, August 27, 2005
I think it was Niels Bohr, the great Danish physicist, who told his fellow scientists many years ago that they had an obligation to try to enlighten laymen about the latest findings of science. This was not long after Einstein's theories of relativity and the development of quantum mechanics had demonstrated that the world in which we live and thrive was much stranger than previously thought. The comfortable and intuitive cosmos, as described by Newtonian mechanics, had been superceded by a world view that seemed not only bizarre, but even incomprehensible.
This new book by Michio Kaku is one of the latest efforts by leading-edge scientists to fulfill that felt need recognized by Bohr. Targeting the educated layman, Kaku addresses his audience in a manner that is both entertaining and non-intimidating. Instead of mathematical descriptions, he relies on everyday analogies to convey his meanings. He includes a good measure of the history behind the theories, spiced with anecdotes and humor. While tackling an inheritantly difficult subject matter, he has succeeded in making it about as accessible as it could possibly be for a lay audience.
I emphasize that this is an up-to-date account. Just a few years ago, some physicists were merely speculating about the possibilities of multiple universes, parallel worlds, time travel, worm holes...things that sounded then more like science fiction than fact. Data only recently acquired by the WMAP satellite and the rapid development of string theory (and its latest incarnation, M-theory) have caused many of the best minds to not only entertain the possibility of such phenomena but, in many cases, consider them necessary corollaries to any credible Grand Unified Theory ( i.e., a "theory of everything.") According to Kaku, we're getting very close to such a theory.
This is heady stuff, presented in a form that makes science fiction, the ramblings of mystics, and the wildest conjectures of amateur cosmologists seem dull by comparison. And it is offered to us by a man who is at the forefront of current physics, a leading theorist in string theory and, most notably, a man who is an expert in assuring that his speculations are not in conflict with known facts.
I recommend this book to anyone who is interested in what science knows today about the past history and nature of our cosmos and what the future may hold. It's an absolutely fascinating read!
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65 of 75 people found the following review helpful:
5.0 out of 5 stars
Very well written, Very intresting., February 16, 2005
I am physics student and found this book very interesting. Kaku assumes that you have some prior elementary knowledge of physics and mathematics. It is not like the recent book of Brian Green where he explains many times the details which makes the reading unpleasant and break the tempo e.g. Kaku on symmetry just assume that the reader must have heard of symmetry groups like SU2 and SU3 and on wave functions and probability amplitudes he assumes that reader have some kind of prior knowledge. He doesn't go technical though so you won't find any equation and unnecessary details. It is one of those books which is easy to follow and fun to read. It makes the reader to think about all that theory and equations in QM. I love the way he told about the Feynman path integration. No body told us that before. Lots of equations in physics and mathematics are just another equation but in this book Kaku put meaning to lot of them which not many people can do successfully.
I found this book much better than the Brian Green's Fabric of Cosmos. It is just like when you compare QM text by Shanker and Sakurai. This is much like Sakurai, concise and interesting and easy to read as Griffiths.
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