The constants of nature From Alpha to Omega-- the numbers that encode the deepest secrets of the universe

Review by Choice Review

Barrow (mathematics, Univ. of Cambridge) offers an interesting combination of history, physics, and philosophy. Using the determination of physical constants as a unifying theme, Barrow traces the development of physics up to the most modern theories. He turns this history into the story of a quest to find out what the fundamental constants might be and if they can truly be thought of as constant. It is no simple path and parts of the book treat complex topics in physics and philosophy. However, one can still get a good understanding of the fundamental questions and problems even if all the topics are not completely comprehended. This ambitious book includes discussions of topics that other writers address in longer and more detailed books. Barrow succeeds because he always returns to his theme of the constants. Included in the material is the development of modern cosmology, with discussions of multiple universes, the controversies associated with the different cosmologies, and the problems of developing a coherent theory. Particular interesting for those wanting a good introduction to physics. ^BSumming Up: Recommended. General readers. E. Kincanon Gonzaga University

Copyright American Library Association, used with permission.

---

Review by Booklist Review

Is our universe the best of all possible worlds or just a fluke? Cosmologists mull that question through various "anthropic principles," so-dubbed because the numbers expressing basic physical forces, if tweaked a little, would forbid life's existence. For example, according to Barrow, if the strong nuclear force were four percent stronger, or the electromagnetic force were four-tenths of a percent weaker, little carbon would form, and you wouldn't be reading this review. So can we assume that everything that came out of the big bang is just right and will remain the same? Not so fast: not only is Barrow a veteran expositor of astrophysics, he is a front-rank researcher whose recent investigation of quasars implies that one physical value (the fine structure constant) has strengthened since the formation of the early universe. Barrow gives the historical background on this startling surprise by weaving into his narrative the hypotheses of earlier physicists about inconstant constants (the brilliant Paul Dirac suspected gravity of infidelity), spicing the story with lively biographical sketches and epigrams. That technique will rivet readers to Barrow's crystalline exploration of the constants, extra dimensions, and the fate of the universe, making this an exemplary popular presentation of high-level science. --Gilbert Taylor

From Booklist, Copyright (c) American Library Association. Used with permission.

---

Review by Publisher's Weekly Review

In this lively volume, Cambridge physicist Barrow (The Book of Nothing) considers the natural constants-the handful of seemingly eternal numerical values, such as the speed of light, the weight of the proton, Planck's constant or the four dimensions of space and time-that constitute the "bedrock" of physical reality. These constants quantify some of the simplest statements that science makes about the world, but as this fascinating work of popular science demonstrates, they have profound implications for the fate of the universe and our place within it. And, Barrow hints, they might not be truly constant. He traces scientists' evolving understanding of the natural constants as they grew to assume a central role in modern relativity theory and quantum mechanics, and outlines ongoing attempts to determine whether they are just inexplicable facts of nature or the logical consequence of some fundamental Theory of Everything. He also raises important philosophical and even religious questions. The natural constants are delicately balanced to make the universe safe for living organisms: altering them more than a hair would make stars burn out, atoms fly apart, and the world as we know it impossible. Is this a happy accident? Proof of Intelligent Design? Or is it a coincidence of our inhabiting one of an infinity of universes that just happens to have living observers? Barrow explores these issues in erudite but lucid prose that draws on an array of thinkers from Einstein to Freud, and, because he withholds his answer to the changing constants question until the end, his book has surprising narrative pull. His account makes some of the most challenging frontiers of science accessible, even enthralling, to laypeople. B&w photos and illustrations. (Jan. 21) (c) Copyright PWxyz, LLC. All rights reserved

(c) Copyright PWxyz, LLC. All rights reserved

---

Review by Library Journal Review

A writer in cosmology with roughly a dozen books for lay readers to his credit (e.g., The Book of Nothing), Barrow here discusses the efforts of various scientists, including himself, to discern some deeper meaning in the various fundamental constants of physics-for example, the so-called fine-structure constant, the gravitational constant, and the speed of light in a vacuum. Why do these constants have the values that they do? What might be their interrelationships? And might these constants turn out to be subtly variable instead of truly "constant"? Barrow gives us the history of early attempts to answer such questions and then describes the current state of thinking. Along the way, he shows how these considerations relate to the structure and ultimate fate of the universe. Barrow acknowledges that this field is very much in a state of flux, explaining what is known in a readable fashion for nonspecialists-though he does assume a moderate degree of scientific literacy on the part of his readers. Strongly recommended for college and larger public libraries.-Jack W. Weigel, Ann Arbor, MI (c) Copyright 2010. Library Journals LLC, a wholly owned subsidiary of Media Source, Inc. No redistribution permitted.

(c) Copyright Library Journals LLC, a wholly owned subsidiary of Media Source, Inc. No redistribution permitted.

---

Review by Kirkus Book Review

Energy is mass times a constant squared. Patient mathematical explainer Barrow (The Book of Nothing, 2001, etc.) delivers a scholarly though always accessible account of the search for that constant--and for great big numbers generally. The nature of the universe is change, he writes, but underlying that change is a substratum that, comfortingly, remains as solid as bedrock: "a golden thread that weaves a continuity through Nature." Puzzling out the constants of that continuity has been a generations-long quest for scientists in many disciplines, including quantum mechanics and the physicists now at work on developing a Grand Theory of Everything. Fundamental to this search, explains Barrow (Mathematical Sciences/Cambridge), has been an agreed-upon set of measurements to take the place of the chaotic standards of old. An entertaining aside deals with the ingenious King David I of Scotland, who decreed that the inch "was to be the average drawn from the measurements of the width of the base of the thumbnail of three men: a mekill' [big] man, a man of messurabel' [moderate] stature, and a lytell' [little] man." That's quite a mouthful, but not the most difficult of Barrow's sentences; mercifully, for even the most complex of ideas, the author takes a breath to explain such matters as the Planck barrier and the laws of thermodynamics while tackling such weighty issues as the mechanics of coincidence (using a fine bit of trivia from the life and work of Shakespeare) and the end of life as we know it. All good stuff, as is Barrow's observation that the number of possible thoughts crammed into the human brain vastly dwarfs the number of atoms in the known universe. That should make us all feel just a little bit smarter. The innumerate will flee in terror, but those with an interest in mathematical history and the strange magic of numbers should find this a satisfying excursion.

Copyright (c) Kirkus Reviews, used with permission.

---

Chapter One Before the Beginning 'What happens first is not necessarily the beginning.' Henning Mankell SAMELINESS 'There is nothing that God hath established in a constant cause of nature, and which therefore is done everyday, but would seem a miracle, and exercise our admiration, if it were done but once.' John Donne Change is a challenge. We live in the fastest moving period of human history. The world around us is driven by forces that make our lives increasingly sensitive to small changes and sudden responses. The elaboration of the Internet and the tentacles of the Worldwide Web have put us in instantaneous contact with computers and their owners all round the world. The threats from unchecked industrial progress have brought about ecological damage and environmental change that appears to be happening faster than even the gloomiest prophets of doom had predicted. Children seem to grow up faster. Political systems realign in new and unexpected ways more quickly and more often than ever before. Even human beings and the information they embody are facing editorial intervention by more ambitious spare-part surgery or the re-programming of parts of our genetic code. Most forms of progress are accelerating and more and more parts of our experience have become entwined in the surge to explore all that is possible. In the world of scientific exploration the recognition of the impact of change is not so new. By the end of the nineteenth century it had been appreciated that once upon a time the Earth and our solar system had not existed; that the human species must have changed in appearance and average mental capability over huge spans of time; and that in some broad and general way the Universe should be winding down, becoming a less hospitable and ordered place. During the twentieth century we have fleshed out this skeletal picture of a changing Universe. The climate and topography of our planet is continually changing and so are the species that live upon it. Most dramatically of all, we have discovered that the entire universe of stars and galaxies is in a state of dynamic change, with great clusters of galaxies flying away from one another into a future that will be very different from the present. We have begun to appreciate that we are living on borrowed time. Cataclysmic astronomical events are common; worlds collide. Planet Earth has been hit in the past by comets and asteroids. One day its luck will run out, the shield provided so fortuitously by the vast planet Jupiter, guarding the outer reaches of our solar system, will not be able to save us. Eventually, even our Sun will die. Our Milky Way galaxy will be drawn into a vast black hole deep in its centre. Life like our own will end. Survivors will need to have changed their form, their homes and their nature to such an extent that we would be challenged to call their continued existence 'living' by our own standards today. We have recognised the simple secrets of chaos and unpredictability which beset so many parts of the world around us. We under-stand our changing weather but we cannot predict it. We have appreciated the similarities between complexities like this and those that emerge from systems of human interaction - societies, economies, choices, ecosystems - and from within the human mind itself. All these perplexing complexities rush along and seek to convince us that the world is like a runaway roller-coaster, rocking and rolling; that everything we once held to be true might one day be overthrown. Some even see such a prospect as a reason to be suspicious of science 3 as a corrosive effect upon the foundations of human nature and certainty, as though the construction of the physical Universe and the vast schema of its laws should have been set up with our psychological fragility in mind. But there is a sense in which all this change and unpredictability is an illusion. It is not the whole story about the nature of the Universe. There is both a conservative and a progressive side to the deep structure of reality. Despite the incessant change and dynamic of the visible world, there are aspects of the fabric of the Universe which are mysterious in their unshakeable constancy . It is these mysterious unchanging things that make our Universe what it is and distinguish it from other worlds that we might imagine. There is a golden thread that weaves a continuity through Nature. It leads us to expect that certain things elsewhere in space will be the same as they are here on Earth; that they were and will be the same at other times as they are today; that for some things neither history nor geography matter. Indeed, perhaps without such a substratum of unchanging realities there could be no surface currents of change or any complexities of mind and matter at all. These bedrock ingredients of our Universe are what this book is about. Their existence is one of the last mysteries of science that has challenged a succession of great physicists to come up with an explanation for why they are as they are. Our quest is to discover what they are but we have long known only what to call them. They are the constants of Nature . They lie at the root of sameliness in the Universe: why every electron seems to be the same as every other electron. The constants of Nature encode the deepest secrets of the Universe. They express at once our greatest knowledge and our greatest ignorance about the cosmos. Their existence has taught us the profound truth that Nature abounds with unseen regularities. Yet, while we have become skilled at measuring the values of these constant quantities, our inability to explain or predict their values shows how much we have still to learn about the inner workings of the Universe. What is the ultimate status of the constants of Nature? Are they truly constant? Are they everywhere the same? Are they all linked? Could life have evolved and persisted if they were even slightly different? These are some of the issues that this book will grapple with. It will look back to the discoveries of the first constants of Nature and the impact they had on scientists and theologians looking for Mind, purpose and design in Nature. It will show what frontier science now believes constants of Nature to be and whether a future Theory of Everything, if it exists, will one day reveal the true secret of the constants of Nature. And most important of all, it will ask whether they are truly constant. From the Trade Paperback edition. Excerpted from The Constants of Nature: From Alpha to Omega - The Numbers That Encode the Deepest Secrets of the Universe by John D. Barrow All rights reserved by the original copyright owners. Excerpts are provided for display purposes only and may not be reproduced, reprinted or distributed without the written permission of the publisher.

---