Reinventing Gravity: A Physicist Goes Beyond Einstein | 
| Author: John W. Moffat
Publisher: Collins
Category: Book
List Price: $27.95
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Avg. Customer Rating:  6 reviews
Sales Rank: 13823
Media: Hardcover
Number Of Items: 1
Pages: 288
Shipping Weight (lbs): 0.9
Dimensions (in): 9 x 5.9 x 0.9
ISBN: 0061170887
Dewey Decimal Number: 530.143
EAN: 9780061170881
ASIN: 0061170887
Publication Date: October 1, 2008
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Product Description
Einstein's gravity theory—his general theory of relativity—has served as the basis for a series of astonishing cosmological discoveries. But what if, nonetheless, Einstein got it wrong? Since the 1930s, physicists have noticed an alarming discrepancy between the universe as we see it and the universe that Einstein's theory of relativity predicts. There just doesn't seem to be enough stuff out there for everything to hang together. Galaxies spin so fast that, based on the amount of visible matter in them, they ought to be flung to pieces, the same way a spinning yo-yo can break its string. Cosmologists tried to solve the problem by positing dark matter—a mysterious, invisible substance that surrounds galaxies, holding the visible matter in place—and particle physicists, attempting to identify the nature of the stuff, have undertaken a slew of experiments to detect it. So far, none have. Now, John W. Moffat, a physicist at the Perimeter Institute for Theoretical Physics in Waterloo, Canada, offers a different solution to the problem. The capstone to a storybook career—one that began with a correspondence with Einstein and a conversation with Niels Bohr—Moffat's modified gravity theory, or MOG, can model the movements of the universe without recourse to dark matter, and his work challenging the constancy of the speed of light raises a stark challenge to the usual models of the first half-million years of the universe's existence. This bold new work, presenting the entirety of Moffat's hypothesis to a general readership for the first time, promises to overturn everything we thought we knew about the origins and evolution of the universe.
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| Customer Reviews: Read 1 more reviews...
 a very nice book November 17, 2008
This is a very well written book on some pressing issues in cosmology/astronomy
and gravity.
The author presents a complete historical view starting from Aristotle's physics
(including also the pioneering contributions of Aristarchos) and ending to his own contributions of asymmetric gravity theory. These are some major points:
(a) this book could easily be considered a layman's book on astronomy and cosmology,
since it has a nice introduction of structure formation, cosmic microwave background, as well quite lucid discussions of dark matter and energy
(b) the author is a down-to-earth scientist paying the due respect to data and
experience; his discussions on string theory and scientific method should be read by all young scientists, since they present the tradition that made science the central focus of our societies from the time of ancient greeks to present (as nicely depicted in the book)
(c) the various alternatives to general relativity are honestly presented with
nicely structured arguments and with a progressing degree of difficulty
(d) I did not like the complete absence of mathematics as well as the fact that
some of the discussions despite their honesty and insight did not treat some
important concepts with adequate detail and depth.
Overall, this is a book that everybody with interest in modern cosmology/gravity
could read with interest. I particularly recommend it for young people that
are thinking of following careers in science.
Alternative to Dark Matter November 15, 2008
Reinventing Gravity by Moffat is a "must read" for anyone who is thinking about modern physics and the role of gravity in it. To put it simply, Moffat gives a very compelling alternative to dark matter. At the time of this review dark matter is said to compose at least 23% of the universe. However; this substance has yet to be directly detected in any lab and its existence is inferred by the application of General Relativity. In a nutshell; Moffat's book presents what could very well be an answer to the "galactic rotation problem" and a myriad of other conundrums in astrophysics. Further; his revolutionary theory is quite sound and takes a much needed step into a review of the overall correctness of Einstein's General Theory of Relativity.
Other physicists such Milgrom (MOND) and Bekenstein (TeVeS) have proposed changes in the theory of gravity. Moffat's addition of modified gravity (MOG) is another important concept that should not be over looked.
Too many physicists are wedded to the concept of dark matter and refuse to contemplate that just as Newton's theory had to be modified by Einstein that Einstein's theory cannot be the last word. MOG by Moffat is a carefully crafted theory that just might make dark matter obsolete. Dark matter is beginning to appear more ad hoc as time passes and clearly the standard theory of gravity may be at fault. I for one encourage both physicists and non-physicists alike to read this book. MOG, as Moffat presents it in Reinventing Gravity, can be understood by the layman as well as the specialist. It is a theory that makes testable predictions and presents a sound alternative to our present understanding of gravity. Moffat also emphasizes that we must buck the trend" in modern theoretical physics of "indulging in speculations that can never be proved or falsified by reality" by once again developing theories that can be tested.
Reinventing the 'matter of LIFE' November 11, 2008
For the layperson, Reinventing Gravity may not be an easy read. However, the flow of the narrative reveals interesting facts about our universe, i.e., "the matter of life" as we have come to know it.
In a systematic approach, the author challenges the status quo by offering a new theory of gravity that is solidly backed by current data without resorting to any unexplained "dark or black matter".
This fascinating book takes the reader on a historic journey - i.e., from the discovery of gravity, to the on-going research of its many associated elements - and helps to unlock the mystery of the universe!!
John Moffat's new gravity theory is exciting and important to understand, let us not be bound by limited thought and imagination. Reinventing Gravity is on my Christmas gift list - I highly recommend it for your list too!
A Fabulous Review of Modern Cosmology November 11, 2008
1 out of 2 found this review helpful
For amateurs interested in modern cosmology, this book is a fabulous treat. It poses all the problems and offers solutions that are empirically testable. No more dark matter. No more big bang. Wow!
Moffat's solutions derive from "MOG," or Modified Gravity theory. MOG, as Moffat explains, is similar to MOND, a modification of Newton's theory to accommodate observational data, such as the rapid rotation of galaxies. However, where as MOG has background independence as required by Einstein's theory of relativity, MOND does not. String theory does not have background independence either. So in this respect MOG is superior to both of these theories.
MOG eliminates the singularity at the centre of black holes. Hence, there is no event horizon surrounding the final state of a collapsed start, and no singularity at its centre. This nicely solves the black hole information-loss problem treated extensively in a recent book by Leonard Susskind.
MOG neatly handles the miracle of creation problem. No need to posit a big bang that defies the second law of thermodynamics. At the beginning of the MOG universe, both negative and positive time evolve with increasing entropy and cancel out.
MOG does not have dark matter, but instead posits a stronger gravity at the beginning of time than the standard model. The CMB does not need to arise from a big bang at all. In addition, the flatness and uniformity problem is solved by suggesting that the speed of light is not constant, but rather the ratio of G to c is. Hence, if G is stronger, c is faster, allowing all parts of the early universe to communicate.
I found that Moffat's book was best read in conjunction with Lee Smolin's recent book, "The Trouble with Physics." In his book, Smolin praises Moffat as a friend whom he respects for his boldness and originality. Perhaps they will write their next book together.
A Must Read For All Who Think November 11, 2008
1 out of 2 found this review helpful
A book to impress a physicist, and yet any layman such as I will find it fascinating, informative, and enjoyable to read. John Moffat has not only challenged Newton and Einstein but has presented history from Plato, Galileo, Kepler, and Copernicus to the present day in such a way to even comprehend, t=0, the beginning of our universe.
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