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#398544 in Books 2011-05-03 2011-05-03Original language:EnglishPDF # 1 9.54 x 1.14 x 6.45l, 1.35 #File Name: 0307265900304 pagesan extraordinary new view of the universe from a leading thinker, | File size: 33.Mb

Roger Penrose : Cycles of Time: An Extraordinary New View of the Universe before purchasing it in order to gage whether or not it would be worth my time, and all praised Cycles of Time: An Extraordinary New View of the Universe:

1 of 1 people found the following review helpful. Excellent review of Penrose's new work in , suitable for the serious layperson and scholar alike.By zzzzzMost books on and mathematics are either too limited in their technical details/mathematics, or too far the other direction (all math, little concept/insight). Penrose's style in his "popular books" may be totally unique in that he discusses ideas in plain language like a "for the layperson" book, but also provides technical details (in an appendix at least). He will respect your intellect if you are looking for something deeper than a "for dummies" type discussion, even if you don't have a university education in science. So, in addition for the obvious target audience of The Interested Layperson", the book would be excellent for practicing mathematicians and physicists looking to get into these new cosmological ideas on a research level, as the scholarly literature can be too terse and dense at first. In fact, the latter observation is what makes Penrose's books, such as Road to Reality gold. His technical literature is written brilliantly as well. Rarely is a person's communication skills on par with their scientific prowess.254 of 260 people found the following review helpful. A Mathematical Origin to the Universe?By Dr. Roy SimpsonMany who wish to buy this book will be familiar with the other works of Professor Roger Penrose (such as ). Some will be curious to learn about a new theory of the origin of the Universe. This book presents a radical new idea which Penrose has been developing in the past few years on the : essentially the idea is that there was a pre-Big Bang era and there will be a post-Big Crunch era too.So one could review both the book and the idea itself. Firstly some will worry about the level of mathematics presented in this book. In the main chapters there are equations such as S = k log V - Boltzmann's Equation. If you are not comfortable with this, then maybe you will not get the most from the book. However if you are comfortable with this and similar physics equations and numbers then the first section of the book is readable. Of course there are plenty of diagrams too. There is some hard maths however and this has been relegated to the Appendix (30 pages). This maths is very advanced and another of Penrose's technical books (Penrose and Rindler Volume 2) would be needed to understand it fully - so that is only for the experts. Given that the reader wont be learning this material in the present book it shows that there is some more complex machinery behind the scenes needed to comprehend the full idea.In the first section the book returns to an old concern of Penrose namely the present in the early universe: less than today - but why so much less? The chapter then focusses in on the Big Bang described using "Conformal Diagrams". The key on page 115 is important for reading these diagrams.Part 3 introduces the new idea called Conformal Cyclic Cosmology (CCC). Here we learn something about the idea that the Big Bang is merely a transition in the longer history of the universe. To get the most out of the mathematics in this section one needs to understand the idea of the conformal metrics introduced. Fortunately there are no calculations about it in the main text, but the idea needs to be understood. In order to develop the CCC hypothesis Penrose then needs to consider various physics issues: entropy, information loss, the presence of in elementary particles. A novel use of other work in these areas provides for an interesting basis for the CCC hypothesis as we also study the far future of the Universe. Finally we close with some observational details from the Cosmic Background Data being gathered by satellites. So CCC is a physically testable theory!If you are interested in another theory being presented at the forefront of Cosmology and Physics then this is for you. Also it provides another view of Penrose's approach to these subjects which is different from the mainstream. But beware that some of the mathematical ideas (of conformal ) go quite deep indeed - easily the subject of another book if this idea is successful!0 of 0 people found the following review helpful. Thought provoking book but not for the laymanBy David SaarThis book reads in many ways like a textbook without the explicit math in the main section(it is in the appendix). It presents a very unique concept of the Universe as a series of aeons that began with a Big Bang and end at10 to the 100th power years when all the Black holes have evaporated through . He links the transition between aeons through the use of Conformal geometry.He does an excellent job of dealing with the issues presented by the second law of Thermodynamics and presents many thought provoking concepts.I do believe this. Book would be tough going for an individual without a fairly strong science and math background . I have a PhD in Physical Chemistry with a minor in Physics and a strong interest in Quantum mechanics and I had to approach this book as I would a textbook, but it was well worth the effort.

From the best-selling author of The Emperorrsquo;s New Mind and The Road to Reality, a groundbreaking book that provides new views on three of cosmologyrsquo;s most profound questions: What, if anything, came before the Big Bang? What is the source of order in our universe? What is its ultimate future?Current understanding of our universe dictates that all matter will eventually thin out to zero density, with huge black holes finally evaporating away into massless energy. Roger Penrosemdash;one of the most innovative mathematicians of our timemdash;turns around this predominant picture of the universersquo;s ldquo;heat death,rdquo; arguing how the expected ultimate fate of our accelerating, expanding universe can actually be reinterpreted as the ldquo;Big Bangrdquo; of a new one.Along the way to this remarkable cosmological picture, Penrose sheds new light on basic principles that underlie the behavior of our universe, describing various standard and nonstandard cosmological models, the fundamental role of the cosmic microwave background, and the key status of black holes. Ideal for both the amateur astronomer and the advanced physicistmdash;with plenty of exciting insights for eachmdash;Cycles of Time is certain to provoke and challenge.Intellectually thrilling and accessible, this is another essential guide to the universe from one of our preeminent thinkers. ldquo;The hyper-density of this book made my brain feel simultaneously wiped out and dazzled.rdquo;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp; -Boston Globe Best Science Books of 2011nbsp;ldquo;Radical . . .nbsp; A surprising and unorthodox work disguised in the jacket of a popular science book, Cycles of Time should prove both deeply enlightening and just as deeply mystifying for anyone who dares to follow along.rdquo;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp; -Peter Woit, The Wall Street Journalnbsp;ldquo;An intellectual thrill ride . . . As Penrose builds a solid foundation for his argument in analyzing universal entropic accumulation and Newtonrsquo;s Second Law, the reader senses something tremendous loomingmdash;mysterious and compelling as a black hole . . . A cosmological page- turner.rdquo;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp; -Y. S. Fing, Washington Independent of Booksnbsp;ldquo;If yoursquo;ll forgive a skiing metaphor, Cycles of Time is a black diamond of a book. But like all steep slopes, sometimes you take a moment from your struggles and look up, and in front of you is an utterly gorgeous view.rdquo;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp; -Anthony Doerr, Boston Globenbsp;ldquo;Profound . . . This fascinating book will surely become a classic in the history of cosmology.rdquo;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp; -Choicenbsp;ldquo;Controversial but intriguing . . . Well worth the effort.rdquo;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp; - Kirkusnbsp;ldquo;Intriguing . . . Penrose makes provocative arguments for his challenging new theory.rdquo;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;- Publishers WeeklyAbout the AuthorRoger Penrose is Emeritus Rouse Ball Professor of Mathematics at the University of Oxford. He has received numerous prizes and awards, most notably the Wolf Foundation Prize in physics, which he shared with . He is the author of three previous books, including The Emperorrsquo;s New Mind. He lives in Oxford, England.Excerpt. copy; Reprinted by permission. All rights reserved.PREFACEOne of the deepest mysteries of our universe is the puzzle of whence it came. nbsp; When I entered Cambridge University as a mathematics graduate student, in the early 1950s, a fascinating cosmological theory was in the ascendant, known as the steady-state model. According to this scheme, the universe had no beginning, and it remained more-or-less the same, overall, for all time. The steady-state universe was able to achieve this, despite its expansion, because the continual depletion of material arising from the universersquo;s expansion is taken to be compensated by the continual creation of new material, in the form of an extremely diffuse hydrogen gas. My friend and mentor at Cambridge, the cosmologist Dennis Sciama, from whom I learnt the thrill of so much new physics, was at that time a strong proponent of steady-state cosmology, and he impressed upon me the beauty and power of that remarkable scheme of things. nbsp; Yet this theory has not stood the test of time. About 10 years after I had first entered Cambridge, and had become well acquainted with the theory, Arno Penzias and Robert Wilson discovered, to their own surprise, an all- pervading electromagnetic radiation, coming in from all directions, now referred to as the cosmic microwave background or CMB. This was soon identified, by Robert Dicke, as a predicted implication of the lsquo;flashrsquo; of a Big-Bang origin to the universe, now presumed to have taken place some 14 thousand million years agomdash;an event that had been first seriously envisaged by Monsignor Georges Lemaicirc;tre in 1927, as an implication of his work on Einsteinrsquo;s 1915 equations of and early observational indications of an expansion of the universe. With great courage and scientific honesty (when the CMB data became better established), Dennis Sciama publicly repudiated his earlier views and strongly supported the idea of the Big Bang origin to the universe from then on. nbsp; Since that time, cosmology has matured from a speculative pursuit into an exact science, and intense analysis of the CMBmdash;coming from highly detailed data, generated by numerous superb experimentsmdash;has formed a major part of this revolution. However, many mysteries remain, and much speculation continues to be part of this endeavour. In this book, I provide descriptions not only of the main models of classical relativistic cosmology but also of various developments and puzzling issues that have arisen since then. Most particularly, there is a profound oddness underlying the Second Law of thermodynamics and the very nature of the Big Bang. In relation to this, I am putting forward a body of speculation of my own, which brings together many strands of different aspects of the universe we know. nbsp; My own unorthodox approach dates from the summer of 2005, though much of the detail is more recent. This account goes seriously into some of the geometry, but I have refrained from including, in the main body of the text, anything serious in the way of equations or other technicalities, all these being banished to the Appendices. The experts, only, are referred to those parts of the book. The scheme that I am now arguing for here is indeed unorthodox, yet it is based on geometrical and physical ideas which are very soundly based. Although something entirely different, this proposal turns out to have strong echoes of the old steady-state model! nbsp; I wonder what Dennis Sciama would have made of it.

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