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    Tuesday, August 29, 2006

     

    Symmetries and Superstrings

    The Elegant Universe: Superstrings, Hidden Dimensions, and the Quest for the Ultimate Theory
    by Brian Greene

    My belief is based on the fact that string theory is the first science in hundreds of years to be pursued in pre-Baconian fashion, without any adequate experimental guidance.
    --Philip Warren Anderson


    Since the middle of the 20th century, the fundamental problem of physics has been finding the Theory of Everything: A theory that would reconcile Relativity, Einstein's theory of the very large; to live alongside of Quantum Mechanics, the paradoxical theory of probabilities on the subatomic level. Both worldviews have been proved, insofar as any scientific theory is ever proved. And neither will allow for the other to be completely correct.

    Professor Greene (who disdains the title of "Professor" or "Doctor", by omission) explains the two theories very well, even to someone who has read about them innumerable times. (In particular, his explanations of Relativity are extraordinary well done.)

    This incredible clarity of purpose and prose continues when he continues into string theory, quantum gravity, and M-theory, although it is dimmed a bit. The book is not math-heavy by any means, relegating such diversions to the endnotes.

    (Unfortunately, there are also many fascinating historical explanations relegated to these same notes. Turning to an endnote, the reader never knows if they'll find an historical illumination, or a block of equations.)

    Apparently, the world is composed of scores of vibrating, undulating loops of string, looped through dimensions beyond our perception. These explanations are are deftly written, and hold the readers attention well. When the narrative moves along to the five competing string theories, and to M-theory, the One Ring of that will unite modern physics, the story becomes a little difficult to follow. But this is a minor quibble.

    When the author details his own small contribution to the field, it is downplayed, giving much credit to his collaborators. A sense of barely contained pride is present in the text simultaneously, giving a wonderful tension to this chapter.

    Since string theory is unproven, the book can't help but end on a tenuous note. The author is hopeful that technology will advance to the point where it is possible to prove that superstring theory is more than a blue-sky physicist's dream.

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