| Description | This book is non-technical -- it has almost no equations, but is well-illustrated. Just having finished it, I feel it gave a good sense of the major issues involved in this still highly speculative and uncertain field. Readable summary of the state-of-the-art in 1988. Author condescends nicely to the reader: he takes pains to repeat over and over, in slightly varying words, the technical points; this made book wordy; but it was a good strategy since, w/o equations, these esoteric ideas come across vaguely at best. Repetition allows at least "ear knowledge" of the jargon. Please don't expect much more at this level.
Like another reviewer, I was not happy with one-third of the book being devoted to twistors, since these strike this outsider as higher on mathematical elegance than on physical content. I will not fault Peat, however, for doing this since: A) due to his friendship with the Penrose Twistor group he is specially qualified to popularise this subject, and B) the Twistor program, a child of Penrose's brain, is rich in guiding principles, and provides therefore a healthy antidote to the superstrings, which grew up higgeldy-piggeldy by a sequence of "accidental" discoveries -- "It seems to work, but, heck, we don't really know why." Twistors have been less a matter of trial and error. At least they work well for massless particles. (Sidelight: In a blackboard discussion w/ Penrose at Cal Tech that I chanced to overhear about 25 yrs. ago, Feynman told Penrose that no one had succeeded in making massless fields cohere together so as to act like massive fields.) |
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