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For David Deutsch, a young physicist of unusual originality, quantum theory contains our most fundamental knowledge of the physical world. Taken literally, it implies that there are many universes “parallel” to the one we see around us. This multiplicity of universes, according to Deutsch, turns out to be the key to achieving a new worldview, one which synthesizes the theories of evolution, computation, and knowledge with quantum physics. Considered jointly, these four strands of explanation reveal a unified fabric of reality that is both objective and comprehensible, the subject of this daring, challenging book. The Fabric of Reality explains and connects many topics at the leading edge of current research and thinking, such as quantum computers (which work by effectively collaborating with their counterparts in other universes), the physics of time travel, the comprehensibility of nature and the physical limits of virtual reality, the significance of human life, and the ultimate fate of the universe. Here, for scientist and layperson alike, for philosopher, science-fiction reader, biologist, and computer expert, is a startlingly complete and rational synthesis of disciplines, and a new, optimistic message about existence.
- Sales Rank: #52686 in Books
- Published on: 1998-08-01
- Released on: 1998-08-01
- Original language: English
- Number of items: 1
- Dimensions: 8.00" h x .90" w x 5.40" l, .72 pounds
- Binding: Paperback
- 390 pages
Amazon.com Review
"Our best theories are not only truer than common sense, they make more sense than common sense," writes physicist David Deutsch. In The Fabric of Reality, Deutsch traces what he considers the four main strands of scientific explanation: quantum theory, evolution, computation, and the theory of knowledge. "The four of them taken together form a coherent explanatory structure that is so far-reaching, and has come to encompass so much of our understanding of the world, that in my view it may already properly be called the first Theory of Everything." Deutsch covers some difficult material with unusual clarity. Each chapter ends with a summary and definitions of important terms, which makes the work an invaluable sourcebook.
From Library Journal
Common sense and reality diverge and then come together again in this mind-blowing book. Maintaining that the best explanation for certain quantum phenomena is that there are parallel universes, i.e., multiverses, Oxford physicist Deutsch posits and then attempts to unify four basic strands?quantum physics, epistemology, evolution, and the theory of computation. Just one astonishing consequence is that quantum computers can collaborate between universes. Deutsch's ideas are exotic and challenging, but his text is surprisingly accessible, and he supplies a glossary and summary at the end of every chapter. For motivated readers, this book is a feast for the mind. Strongly recommended for academic and larger public libraries.?Gregg Sapp, Univ. of Miami Lib., Coral Gables, Fla.
Copyright 1997 Reed Business Information, Inc.
From Booklist
In the library of physics for laypeople, Deutsch's book is unique. Correction: it is multiversal, existing in innumerable universes that Deutsch argues exist alongside the "real" universe that people perceive. Explaining that, and persuading the reader of its scientific truth, makes this work unique. Another of Deutsch's mindbenders is that each person could be resurrected near the Big Crunch (if there is one) by a universal computer with infinite memory, a conclusion discussed (and unfairly dismissed by most scientists, according to Deutsch) in Frank Tipler's The Physics of Immortality (1994). Deutsch, a quantum physicist at Oxford University, builds toward the computerized second coming on the basis of the well-known, reproducible experiment that conclusively establishes the quantum nature of light and of reality. He then discusses three more topics--computation theory, evolution, and epistemology--combining them with quantum theory to construct his Theory of Everything, the grail of all theoretical physicists. Deutsch allows that his is a minority view among his peers, but the confidence with which he presents his views, and the absence of condescension in his style, accesses nonscientists to his seemingly alien world(s). Gilbert Taylor
Most helpful customer reviews
187 of 202 people found the following review helpful.
Mind-bending analysis that falls short in places
By D. Cloyce Smith
Deutsch's presentation is fascinating, mind-expanding, challenging, provocative, and--at times--riveting. It is also infuriating, perplexing, reductive, and--at times--vague. (Please note: I am not convinced that the multiverse as Deutsch describes it exists, nor am I threatened by the possibility that it might. As a result, I do not mean to quarrel with--or support--the idea itself. Instead, I am reviewing Deutsch's book from the point of view of a lay reader.)
I do recommend this book to anyone interested in reading a summary of the pursuit of a "theory of everything" and a defense of the science of parallel universes. Deutsch's theory of everything depends on four theories: quantum (as espoused by Everett), epistemology (Popper), evolution (Dawkins), and computation (Turing). Even if one does not ultimately agree with Deutsch's ideas, his book offers some interesting thought experiments (the chapter on "time travel" is especially fun) and a concise overview of several scientific trends. In addition, his book provides a decent defense of why the theory of the multiverse should be considered a reasonable explanation for the interference results obtained the infamous two-slit experiment.
That said, I do think Deutsch's book contains many shortcomings. First, although the multiverse may be a valid explanation for interference phenomenon, Deutsch fails to convince that it is THE explanation. In one short paragraph, he dismisses David Bohm's theory of wave-particle duality. "Working out what Bohm's invisible wave will do requires the same computations as working out what trillions of shadow photons will do." One could easily reverse this sentence as a criticism of Everett and Deutsch: that the trillions of unseen photons requires the same computations as working out what Bohm's single invisible wave will do. Deutsch does not explain (in this book, anyway) why trillions of photons are simpler than one wave, and he does his readers a disservice by pretending that Bohm's work does not deserve a full refutation.
Second, and similarly, Deutsch dismisses with an even shorter paragraph the charge that his "theory of everything" is anthropocentric. (He pretty much admits it is, but tries--unconvincingly, to this reader--to turn it into an argument in his favor.) Third, his discussion of evolution (one of the four "equal" strands of his theory of everything) is a mere 25 pages and, unlike the rest of the book, is at times incomprehensible and seems completely indebted to Dawkins. (Not that there is anything wrong with Dawkins's work; rather, Deutsch just seems in over his head during this part of the book.) Fourth, he rejects Kuhn's belief in the rigidity of scientific paradigms (for example, the inability of thinkers in Galileo's time to accept the full implications of the Copernican system because they were so used to thinking of the world in Ptolemaic and Judeo-Christian terms), but then he describes a modern scientific establishment that refuses to accept the multiverse implications of quantum theory because they are rooted to the concept of a single universe. (Just because modern scientific discourse is more civil does not mean that Kuhn's argument is incorrect. Deutsch's opponents are still mocking him behind his back, in book reviews, and anonymously on this Web site. Or, even more effectively, they are ignoring him altogether.) And, finally, his discussion of Tipler's omega-point theory is hurried and unfortunately nebulous: at one point, Deutsch seems to be saying that knowledge in the universe will become omniscient and omnipresent--which is practically the same as saying that the universe will become itself.
Nevertheless, regardless of what you think of its implications, Deutsch's views deserve serious consideration and, as necessary, rebuttal--not mockery and scorn. In the same way that we read Lucretius even though we know him to be wrong (or, for that matter, Einstein because we believe he is mostly right), we should read Deutsch's work because he challenges the way we look at our world.
76 of 82 people found the following review helpful.
Best science book of the decade
By Dick Oliver
There are a lot of books that try to explain science to the layman and forward some new and grandiose worldview at the same time. Most of them do okay at the former, but fail miserably at the latter. This book does both, perhaps better than any book I've ever read (and I read a lot of science books). Deutsch identifies and explains the most important and interesting aspects of both quantum theory (his main topic) and the intimate relationships between it and the sciences of epistemology, computability, and evolution. The explanations are intuitive and easy to follow if you have any technical background at all, and sometimes even if you don't. Better yet, he convincingly synthesizes them into a truly compelling argument for a new (well, okay, not new but not yet widely accepted) view of reality on the deepest and widest possible scale. He steps onto a bit more shaky ground when he tries to bring in a "kitchen sink" of disciplines, some of which he doesn't seem to know nearly as much about as his native discipline (physics). Still, even the less convincing extensions to his basic idea are well considered and thought-provoking. And the basic idea itself--that zillions of not-quite-identical copies of our universe exist and are just as real and tangible as our own--is more than enough to make this book a phenomenal "mind-expanding" experience
55 of 59 people found the following review helpful.
quantum computers
By Palle E T Jorgensen
The book was published in 1997, and a lot has happened since then. Yet the foundations retain their permanence, and David Deutsch's captivating writing is as fresh as ever. Despite the availability of newer books, for the layman/woman, now almost 10 years later, I would still rank this book at the top. There is a lot in the book; and yet, the ideas are presented in a clear and engaging way. The author is a pioneer, a giant in modern physics; he was and is a driving force in new discoveries in the subject. Yet he has his personal way of explaining physical reality. His view is not shared by all scientists, one should admit. However, there is agreement about the scientific conclusions. The first chapter in the book stresses *explanation*, our understanding of the reason for things. There are other views of science, e.g., instrumentalism: predicting the outcome of experiments.
The author's view on quantum theory is based his idea about parallel universes. While fascination, the reader should be aware that there are alternative theories for explaining quantum phenomena. An important concept in quantum theory and quantum computation is "decoherence", and it is explained (ch 9) in terms of different (parallel) universes. In ch 9 about quantum computers, it might have been only fair to mention that there are such other current views on decoherence; but this is a minor complaint.
Presentation: I love that each chapter concludes with a section on terminology and a summary.
As a subject theoretical computer science started with Alan Turing and John von Neumann in the 1940ties: Classical computation follows the model of Turing,-- strings of bits, i.e., 0s and 1s; and a mathematical model which is now called the Turing machine.
Instead of bits, why not two-level quantum systems, e.g., models built from electrons or photons? Such an analogues model for computation based on two-level quantum systems, and a quantum version of Turing's machine was suggested in the 1980ties by R.P. Feynman. The form it now has owes much to the author himself, David Deutsch. But it wasn't until Peter Shor's qubit-factoring algorithm in the late 1990ties (not covered in the book) that the subject really took off, and really caught the attention of the mainstream science community, and of the general public: The 'unbreakable' codes might be breakable after all !
That there is a polynomial factoring algorithm, as Shor showed, shook up the encryption community, for obvious reasons, and created headlines in the news. Ideas in the quantum realm, and not part of classical thinking, include superposition of (quantum) states, the EPR paradox (1935), and (quantum) coherence. Although these concepts are at the foundation of quantum theory, they make a drastic change in our whole theoretical framework of computation: Now one passes from the familiar classical notion of bit-registers to that of qubit-registers, and the laws of quantum mechanics take over. Mathematical physicists and computer scientists must revisit the old masters: Bohr, Einstein, Heisenberg, Pauli, and Dirac. In passing from logic gates to quantum gates (unitary matrices), the concept of switching-networks from traditional computer science now changes drastically. The changes introduce brand new scientific challenges, and new truly exciting opportunities. I believe that this book does justice to this, and that it is still a fascinating and thought provoking invitation to some of the most intriguing trends in modern physics.
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