Cycles of Time An Extraordinary New View of the Universe From the best selling author of The Emperor s New Mind and The Road to Reality a groundbreaking book that provides new views on three of cosmology s most profound questions What if anything came be
From the best selling author of The Emperor s New Mind and The Road to Reality, a groundbreaking book that provides new views on three of cosmology 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 thiFrom the best selling author of The Emperor s New Mind and The Road to Reality, a groundbreaking book that provides new views on three of cosmology 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 Penrose one of the most innovative mathematicians of our time turns around this predominant picture of the universe s heat death, arguing how the expected ultimate fate of our accelerating, expanding universe can actually be reinterpreted as the Big Bang 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 physicist with plenty of exciting insights for each 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.

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I like to refresh myself on my intuitive understanding of physics every once in a while since I won't ever admit to understanding more than 30%40% of the math.Even so, what I do understand is still more than enough to endlessly fascinate and make me sit around fantasizing and ruminating and dreaming up new ways to describe what I know and how to apply it in interesting ways.It's the curse of reading a ton of SF, too, and I'm pretty sure I'm not alone in this weird little habit of mind games and [...]
This book introduces Conformal Cyclic Cosmology: an amazingly beautiful idea, which I would love to be true. Unfortunately, the evidence to date is far from compelling. But, even if it isn't correct, Penrose is asking such interesting questions that the book is absolutely worth reading.So here's my understanding of what it's about. Penrose starts by explaining the basic puzzle, which was a key theme in The Road to Reality and has been tantalizing cosmologists in general for a good while. As ever [...]
I read this book cover to cover, and then the appendix and then tried again. I took a tea break walked in a circle, picked back up the book and continued to stare at it trying to glean somehow the information that I obviously was not meant to be clever enough to follow. I felt like Zoolander beating up the computer to get the information out of it. I can honestly admit that I could not understand nor have any basis for figuring out the vast majority of this book. I tried. I am not stupid. I know [...]
The book themes areHow wide is our universe? When does the universe start? When does the universe finish? How long the universe 's age? What is the quantum gravity theory?. etc
Unabridged. Read by Bruce Mann. 7hrs 22 minBig Bang or Steady State? Big Bang! however an organised Big Bang.The second law of thermodynamics states that the entropy of an isolated system never decreases, because isolated systems spontaneously evolve towards thermodynamic equilibrium—the state of maximum entropy. Equivalently, perpetual motion machines of the second kind are impossible.From Wiki: Sir Roger Penrose OM FRS (born 8 August 1931), is an English mathematical physicist, recreational [...]
I found this completely unintelligible.Reading this book was like being kidnapped. I had a bag over my head and kept asking where we were going. Mostly I was ignored but occasionally I was told "we're turning left" or an explanation of how the steering mechanism worked.I have a hard time imagining who the intended audience is. It's definitely not the general population.You need some serious background in physics and mathematics to even start to understand what he's on about. So much so that you [...]
"The entire fabric of life on earth requires the maintaining of a profound and subtle organization, which undoubtedly involves entropy being kept at a low level." "The structure of life on this planet would run rapidly down were it not for a powerful lowentropy source, upon which almost all life depends, namely the Sun."Remember reading Penrose in college and being blown away. Favorite living theorist, turns complex ideas into digestible knowledge with simple charts and a straightforward writi [...]
Picked this off the 'in' shelf at the library. I can see from the date stamps that loads of people have been reading this. Technically it lost me very soon. While I have previously encountered null cones and think I get the drift  I have also previously encountered strict conformal diagrams  and they are still complete mysteries. Maybe next time. Because that is what I love  I might not understand very much but each time I read a book like this I do understand a little more. And I just love t [...]
I think is a book fulfilled of innovative ideas and surronded by a fresh phylosophy, it's what I wanted from such a book. I will reread it soon because of some parts I didn't understand very well.Probably I would like to see more concepts explained in the appendices, that's it.
The explanation of what happens before the big bang is laid out nicely in Roger Penrose’s book “Cycles of Time”. This book, like all Penrose, is not for wimps but at least this time he puts the Riemann geometry and manifold calculus in the appendix. According to Penrose the big bang is merely the remnants of the previous Universe which at the end of time has been cleansed of all its matter by black holes and Hawking radiation. As the boundaries of any Universe approach infinity spacetime [...]
Entropi, Hawking isimasi, isik konisinin kullanimlari konularinda geleneksellesmis bilgilerin uzerine bambaska bir bakis acisi getiriyor. Bu anlamda, bazen Feynman Lecture's okurken hissedilen "Bize niye boyle ogretmediler yahu?" duygusu hissedilebilir. Karadeliklerin faz uzayinin boyutunu kuculterek entropiyi baslangictaki durumuna dusurmesi fikri gercekten cok ilginc. Bu konu uzerinde cok daha fazla okuma yapmak gerek. Kitabin ana iddiasi CCC dusuncesi henuz eksik. Kutlecekim dalgalarinin etki [...]
This is a fun and (from the midpoint) challenging book.The prefacing fiction story is a major groan, you can skip through it.Penrose relies a lot on figures throughout the book.This poses some difficulty for those listening to the audio versionThe problem CCC (Conformal Cyclic Cosmology) attempts to solve is:Why does the universe have a lowentropy beginning?(Specifically, why is this low entropy only in the gravitational degrees of freedom?)As a computer programmer, I have no problem whatsoever [...]
Crikey, this was hard work! Whilst I have the deepest respect for Professor Penrose (whom I saw lecture more than 30 years ago) I've got to say that this book doesn't work for this particular lay reader and I suspect it won't work for many others. The topological concepts are really difficult and much of the discussion of entropy rather baffling. I'm not sure I could summarise what I think the Prof is asserting, let along have any understanding of it. I have only the faintest glimmer of what he' [...]
There are many other reviews out there, so I'll just add this snippet. I found it ironic* that Penrose thought his readers might get hung up on ln vs log10 and spend so much time in the introduction to entropy on this distinction, and then later got into conformal mappings and tensors with less introduction!*At first read, I just found it annoying and wondered what was coming in the book  I never would have guessed.I did "read"/listen to this as an audiobook. The figures were included as a pdf [...]
I'm not sure who the intended audience of this book is. It is not as technical as a scientific paper, but it is way more technical than a popular science book. Roger Penrose is clearly much more comfortable with linear algebra and tensor calculus than this reader.
Interesting, but ultimately deeply depressing, if he's right  and I don't believe he is  but then who am I to disagree?
hot damn, it's the geek event of the year!mathlumbia/~woit/wo
A joint review of:Cycles of TimeRoger PenroseThe Grand DesignStephen Hawking and Leonard MlodinowOnce upon a time, Roger Penrose and Stephen Hawking collaborated on a seminal piece of work which proved that if the general theory of relativity is correct our Universe began from a state of infinite density – a singularity. The investigation of the implications of that work, now more than 40 years old, still reverberate, providing the basis for intense debate among cosmologists. Since the 1960s, [...]
La "Cosmología Cíclica Conforme" es una teoría sobre el origen del Universo creada por el autor. De sobras es conocido este hombre por su seriedad y sus avances dentro de la cosmología, pero me da la impresión que con esta teoría se ha columpiado un poco.En primer lugar explica la Segunda Ley de la termodinámica un poco de aquélla manera (pero no incorrectamente, ojo), para que luego ajuste a su teoría. En otras partes del libro acusa a otros científicos de asumir como ciertos algunos [...]
A challenging book for the average person because of all the math and equations strewn throughout the book. I think you have to have at the very least a basic understanding of cosmology, physics, and math to make this book worth reading. Penrose writes well, even for this technical of a book, and even though I didn't understand any of the equations or half the explanation of what the CCC is, I read through it fairly easily and with enjoyment. Every book and video takes me further down the path o [...]
A challenging book for the average person because of all the math and equations throughout the book. I think you have to have at the very least a basic understanding of cosmology, physics, and math to make this book worth reading. Penrose writes well, even for this technical of a book, and even though I didn't understand any of the equations or half the explanation of what the CCC is, I read it fairly easily and with enjoyment. Every book and video takes me further down the path of understanding [...]
This is a very imaginative book, outlining Penrose's views on cosmology in pretty clear terms. It does cover much of the ground explored in Road to Reality, but more clearly explained and tied together. The book then explicitly states that it is possible to move from our present eon into a successive eon with another Big Bang and that we might be able to see signs of the previous eon in the Cosmic Microwave Background. The implications of that are breathtaking.
The narrator did a superb job with a difficult text, reading equations and very theoretical stuff. It was fun to catch glimpses of the world that Penrose described. I only caught glimpses, but I would catch more on subsequent listens.It did leave questions in my mind. For example, why is he so vehemently against string theory and its requisite extra dimensions when he accepts the need for 10 dimensions for the Einstein theory of general relativity?
I would award this book 5 stars but I don't know enough theoretical physics to make heads or tails of the arguments supporting the adoption of CCC. I will, however, say that this was an interesting look inside a physicist's head and inside of the culture of communication within the physics community.
Every time I read Penrose, I love the fact that he is not afraid to make his popular science books a little bit technical. This book was an excellent reminder and take on the 2nd law of Thermodynamics and a brilliant coverage of the theory that may reconcile the Big Bang theory with the steady state universe
I wish Penrose would write a "for dummies" version of this book. The material is extremely interesting, but the exposition could use more explanations and background to make it accessible to nonphysicists.
This is a good book but tough as an audiobook since many diagrams are needed for reference.
Went over my head a bit, I think I need to do some wider reading about relativity before tackling this book again
Love it, but I think it might help that I studied general relativity in Uni; it's quite technical
Cycles of Time is Roger Penrose's attempt at (mostly) fleshing out his hypothesis of conformal cyclic cosmology (CCC), which is along the lines of previous cyclical cosmology proposals, suggesting that the current universe is merely a conformally ("smooth") geometric extension of universes past.Penrose's prologue and epilogue in Cycles of Time are silly, but it is to my understanding that they're to presuppose the narrative structure of the book. Penrose begins with the problems of the second la [...]