Joseph Silk

On the Shores of the Unknown

What we hear about the universe can sometimes seem a bit unlikely, with most of it being in the form of unseen matter and energy. In On the Shores of the Unknown: A Short History of the Universe Joseph Silk demonstrates that the evidence is stronger than you might think. He describes how the fluctuations in the Cosmological Microwave Background impose constraints on the nature of the cosmos, but goes on to look at several other discoveries which support the cosmologists models. In particular he examines what theories of galaxy formation can tell us about the large scale nature of universe.

Silk is an expert in the subject of cosmology, but this is a non-technical book - there is no mathematics in it, and you don't need to have studied physics to follow the arguments. However I wouldn't recommend it to someone who hasn't read any other books on cosmology as I feel that its rather rough-and-ready - the material isn't really presented in a way that could be followed easily by a complete beginner. On the other hand, if you have read several popular science books on cosmology, but are beginning wonder why we should give any more credence to professional cosmologists than to any other people's ideas, then this book will give you plenty of useful information.

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Hardcover 254 pages
ISBN: 0521836271
Salesrank: 765881
Weight:1.46 lbs

Published: 2005 Cambridge University Press

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Hardcover 254 pages
ISBN: 0521836271
Salesrank: 435000
Weight:1.46 lbs

Published: 2005 Cambridge University Press

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Hardcover 254 pages
ISBN: 0521836271
Salesrank: 444937
Weight:1.46 lbs

Published: 2005 Cambridge University Press

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Product Description
Astronomer Joseph Silk explores the Universe from its beginnings to its ultimate fate. He demonstrates how cosmologists study cosmic fossils and relics from the distant past to construct theories of the birth, evolution and future of the Universe. Stars, galaxies, dark matter and dark energy are described, as successive chapters detail the evolution of the Universe from a fraction of a microsecond after the Big Bang. Silk describes how physicists apply theories of subatomic particles to recreate the first moments of the Big Bang, and how astronomers chart the vast depths of space to glimpse how the most distant galaxies formed. He gives an account of the search for dark matter and the dark energy that will determine the ultimate fate of the Universe. Joseph Silk is the Savilian Professor of Astronomy and Head of the Astrophysics Department at the University of Oxford. He was previously Professor of Astronomy at the University of California, Berkeley. He holds a BA in Mathematics from Clare College, Cambridge, and a PhD in Astronomy from Harvard University. Silk is the author, or co-author, of many books, including The Left Hand of Creation (Basic Books, 1994) and A Short History of the Universe (WH Freeman, 1997). He is a Fellow of the Royal Society, the American Physical Society, and the American Association for the Advancement of Science.

Product Description

Astronomer Joseph Silk explores the Universe from its beginnings to its ultimate fate. He demonstrates how cosmologists study cosmic fossils and relics from the distant past to construct theories of the birth, evolution and future of the Universe. Stars, galaxies, dark matter and dark energy are described, as successive chapters detail the evolution of the Universe from a fraction of a microsecond after the Big Bang. Silk describes how physicists apply theories of subatomic particles to recreate the first moments of the Big Bang, and how astronomers chart the vast depths of space to glimpse how the most distant galaxies formed. He gives an account of the search for dark matter and the dark energy that will determine the ultimate fate of the Universe. Joseph Silk is the Savilian Professor of Astronomy and Head of the Astrophysics Department at the University of Oxford. He was previously Professor of Astronomy at the University of California, Berkeley. He holds a BA in Mathematics from Clare College, Cambridge, and a PhD in Astronomy from Harvard University. Silk is the author, or co-author, of many books, including The Left Hand of Creation (Basic Books, 1994) and A Short History of the Universe (WH Freeman, 1997). He is a Fellow of the Royal Society, the American Physical Society, and the American Association for the Advancement of Science.

Short History Leaves Universe Unknown **
Oxford astronomer Joseph Silk bravely attempts to explicate modern cosmology in only 241 pages. He enlightens us with not only with the fundamental conclusions and uncertainties but also with the cleaver experiments and calculation that inform them. From cosmic microwave background and the expanding universe to dark matter and galaxy formation, Silk does not ask the reader to take his word for it; he presents the experimental data, interpretations, and conjectures pertaining to all the critical aspects of our universe's history. After an introduction, Silk plunges into astronomical nitty-gritty, describing more than ten methodologically similar techniques for determining cosmic distances. The distances of stars and galaxies coupled with their velocities implies an expanding universe of approximately known age. This approximation precariously dated the universe as younger than some solar system rocks. However, the universe aged with increasingly accurate measurements. The alternative theory of steady state cosmology was no longer needed and was finally debunked by the discovery of cosmic microwave radiation, the Big Bang theory's unmistakable fingerprint. This microwave radiation, independent of direction and originating from deep space, is the relic of the exceedingly hot first few hundred thousand years following the big bang. The radiation has cooled to -270? C over the past 15 billion years but remains detectable. With the big bang theory firmly supported, the challenge of explaining the first moment of universe looms large as the theories of physics collapse during the first 10-43 s of the universe. In his prologue, Silk sets out to make a modern description of the Big Bang theory truly accessible to the lay cosmologist, enabling an appreciation (but not a justification) of theological interpretations of cosmology. Not to disappoint, Silk finally throws a bone to the religiously inclined reader in the fourth chapter: "The Big Bang was an act of creation. Was it a singular, unique event, or is creation of matter a natural occurrence? And what existed before this event? Was the universe created out of nothing? To better understand how to answer these questions, it is necessary to consider what is meant by, or more precisely a vacuum." Heisenberg's uncertainty principle predicts continuously appearing and vanishing particles even in a perfect vacuum. The quantum appearance of paired matter in the strong electric field of the early universe created fluctuations in energy density and is thereby responsible for the macro structure of the universe and perhaps even the creation of the universe itself. The difficulty in describing the first moments of our universe lies in the failure of modern physics at extreme conditions. While electromagnetic, weak nuclear, and strong nuclear forces coalesce according to quantum theory at such small distances and high energy, our theory of gravity fails. To address this issue Silk moves quickly from mini-black holes to superstring theory to inflationary expansion finally arriving at the anthropic principle, a G-d send for the readers who are looking for Him. Even the best theories allow for so many possible scenarios that the only way to arrive at the universe we observe is to require the possibility of human existence. But by the next chapter we are back where we began: "Creation is the essence of the Big Bang theory. We can delegate creation of space and time to the pundits of metaphysics, theology. And even quantum gravity. In this field it is difficult to separate fact from fiction, and faith from fantasy, since any conclusions are far removed from the domain of experimental, testable, or even fully self-consistent physics." At present, cosmology is but a tease. After further proofs of the Big Bang theory, the reader encounters technical and detailed explanations of dark matter, the still-mysterious dark energy, black holes and finally the formation of galaxies. However, the book fails to make cosmology "truly accessible." Although not even a lay cosmologist, I majored in chemistry, studied quantum mechanics, and dabbled in string theory. Yet only after rereading convoluted sentences and arduous paragraphs did I have a faint idea of what is flying in space. I gave up on sentences such as: "More precisely, space is accelerating, albeit at a very slow rate that corresponds to a cosmological constant which is equivalent to a mass density for the vacuum energy that amounts to about two-thirds of the critical value for recollapsing the universe." Perhaps precise, but not exactly bedtime reading. Cutesy poetics sprinkled haphazardly among tortuous sentences highlight the arduous style rather than aid comprehension. Silk vacillates between assuming scientific knowledge like photons unifying electricity and magnetism into a single force and explaining well-known concepts like the Doppler effect at length. He introduces complex ideas with their obscure names, leaving me in a vacuum of understanding, only to describe them in a subsequent sentence, paragraph, or even chapter. Even the somewhat helpful diagrams are not fully explained. Certain usages may be awkward or unintelligible for non-British readers; who knew unity plus unity equals two? The ambitious task of explaining modern cosmology in some detail for the layman fails despite its admirable ambition. In such a short book, focusing of the details of discovery leaves little room for fully describing the ramifications. Perhaps if I read slower and repeatedly some of the concepts would have sunk in, but I have the distinct impression that these ideas could have been expressed lucidly. Those already familiar with the concepts may benefit from a succinct and organized overview of modern cosmology, but the novice should look elsewhere.

Short History Leaves Universe Unknown **

Oxford astronomer Joseph Silk bravely attempts to explicate modern cosmology in only 241 pages. He enlightens us with not only with the fundamental conclusions and uncertainties but also with the cleaver experiments and calculation that inform them. From cosmic microwave background and the expanding universe to dark matter and galaxy formation, Silk does not ask the reader to take his word for it; he presents the experimental data, interpretations, and conjectures pertaining to all the critical aspects of our universe's history.

After an introduction, Silk plunges into astronomical nitty-gritty, describing more than ten methodologically similar techniques for determining cosmic distances. The distances of stars and galaxies coupled with their velocities implies an expanding universe of approximately known age. This approximation precariously dated the universe as younger than some solar system rocks. However, the universe aged with increasingly accurate measurements. The alternative theory of steady state cosmology was no longer needed and was finally debunked by the discovery of cosmic microwave radiation, the Big Bang theory's unmistakable fingerprint.

This microwave radiation, independent of direction and originating from deep space, is the relic of the exceedingly hot first few hundred thousand years following the big bang. The radiation has cooled to -270? C over the past 15 billion years but remains detectable. With the big bang theory firmly supported, the challenge of explaining the first moment of universe looms large as the theories of physics collapse during the first 10-43 s of the universe.

In his prologue, Silk sets out to make a modern description of the Big Bang theory truly accessible to the lay cosmologist, enabling an appreciation (but not a justification) of theological interpretations of cosmology. Not to disappoint, Silk finally throws a bone to the religiously inclined reader in the fourth chapter:

"The Big Bang was an act of creation. Was it a singular, unique event, or is creation of matter a natural occurrence? And what existed before this event? Was the universe created out of nothing? To better understand how to answer these questions, it is necessary to consider what is meant by, or more precisely a vacuum."

Heisenberg's uncertainty principle predicts continuously appearing and vanishing particles even in a perfect vacuum. The quantum appearance of paired matter in the strong electric field of the early universe created fluctuations in energy density and is thereby responsible for the macro structure of the universe and perhaps even the creation of the universe itself. The difficulty in describing the first moments of our universe lies in the failure of modern physics at extreme conditions. While electromagnetic, weak nuclear, and strong nuclear forces coalesce according to quantum theory at such small distances and high energy, our theory of gravity fails. To address this issue Silk moves quickly from mini-black holes to superstring theory to inflationary expansion finally arriving at the anthropic principle, a G-d send for the readers who are looking for Him. Even the best theories allow for so many possible scenarios that the only way to arrive at the universe we observe is to require the possibility of human existence. But by the next chapter we are back where we began:

"Creation is the essence of the Big Bang theory. We can delegate creation of space and time to the pundits of metaphysics, theology. And even quantum gravity. In this field it is difficult to separate fact from fiction, and faith from fantasy, since any conclusions are far removed from the domain of experimental, testable, or even fully self-consistent physics."

At present, cosmology is but a tease.

After further proofs of the Big Bang theory, the reader encounters technical and detailed explanations of dark matter, the still-mysterious dark energy, black holes and finally the formation of galaxies. However, the book fails to make cosmology "truly accessible." Although not even a lay cosmologist, I majored in chemistry, studied quantum mechanics, and dabbled in string theory. Yet only after rereading convoluted sentences and arduous paragraphs did I have a faint idea of what is flying in space. I gave up on sentences such as:

"More precisely, space is accelerating, albeit at a very slow rate that corresponds to a cosmological constant which is equivalent to a mass density for the vacuum energy that amounts to about two-thirds of the critical value for recollapsing the universe."

Perhaps precise, but not exactly bedtime reading. Cutesy poetics sprinkled haphazardly among tortuous sentences highlight the arduous style rather than aid comprehension.

Silk vacillates between assuming scientific knowledge like photons unifying electricity and magnetism into a single force and explaining well-known concepts like the Doppler effect at length. He introduces complex ideas with their obscure names, leaving me in a vacuum of understanding, only to describe them in a subsequent sentence, paragraph, or even chapter. Even the somewhat helpful diagrams are not fully explained. Certain usages may be awkward or unintelligible for non-British readers; who knew unity plus unity equals two?

The ambitious task of explaining modern cosmology in some detail for the layman fails despite its admirable ambition. In such a short book, focusing of the details of discovery leaves little room for fully describing the ramifications. Perhaps if I read slower and repeatedly some of the concepts would have sunk in, but I have the distinct impression that these ideas could have been expressed lucidly. Those already familiar with the concepts may benefit from a succinct and organized overview of modern cosmology, but the novice should look elsewhere.

Cosmo-tastic *****
Written by a true authority in the field, this book promises much. Unlike many scientists writing for a more general audience, here Joe Silk has managed to deliver on that promise. His easy style and precise prose leads you through the gamut of cosmological theory in a very readable narrative. Even a seasoned astrophysicist comes away with a clearer understanding of this fascinating subject.

Cosmo-tastic *****

Written by a true authority in the field, this book promises much. Unlike many scientists writing for a more general audience, here Joe Silk has managed to deliver on that promise. His easy style and precise prose leads you through the gamut of cosmological theory in a very readable narrative. Even a seasoned astrophysicist comes away with a clearer understanding of this fascinating subject.