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The Road to Reality: A Complete Guide to the Laws of the Universe

4.05 of 5 stars 4.05  ·  rating details  ·  3,997 ratings  ·  134 reviews
Roger Penrose, one of the most accomplished scientists of our time, presents the only comprehensive and comprehensible account of the physics of the universe. From the very first attempts by the Greeks to grapple with the complexities of our known world to the latest application of infinity in physics, The Road to Reality carefully explores the movement of the smallest ato ...more
Paperback, 1099 pages
Published January 9th 2007 by Vintage (first published 2004)
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Sep 05, 2011 Manny rated it 5 of 5 stars  ·  review of another edition
Recommends it for: People who seriously want to understand physics better
Recommended to Manny by: Nick Black
Many of my all-time favourite books make the list because they show you what it's like to be inside the mind of an extraordinary person. While you're reading them, Churchill's History of the Second World War and Yourcenar's Mémoires d'Hadrien let you be a great statesman at a pivotal moment in history. Simone de Beauvoir's autobiography, more than any other book I know, gives you the feeling of being a major literary figure. Polugayevsky's Grandmaster Preparation, which many chessplayers treat a ...more
Dave Langford, SF&F critic and reviewer, in his long-since defunct column for White Dwarf magazine, once said that, "There is a tendency to over-praise big books simply because one has got through them." I agree that this tendency exists but note that Langford gave no reason for it. I think the reason is more or less macho intellectual pride; look at me! I read this honking great saga! It must be great or I'd have to admit wasting my time! And I need to show off my intellectual credentials! ...more
Sanjay Gautam

Its the greatest science book ever written in the whole world, since the beginning of the time. Its certainly not popular science, its hardcore science and maths, written for general audience.
Nick Black
Penrose came to GT and gave an open lecture on cosmic parameters and cosmological arguments from the 2nd Law of Thermodynamics (chapter 27 in this book, one of the most ambitious and impressive -- if incomplete, a bit uneven, and just as taxing as you've heard -- catechisms I've ever read), and a closed lecture on twistor theory (chapter 33), and signed my copy! w00t! I shook Sir Roger's hand as trillions of neutrinos passed through us both, completely undetected, our entangled R-type state evol ...more
Cassandra Kay Silva
Penrose, Penrose, Penrose. Oh how I LONG to know thee. I am becoming minorly obsessed with you and your work. I am pacing for crying out loud. I am running myself in circles. Opening, closing, referencing, coming back, straining my eyes as if that will make me see the world that you do. Why do you elude me so? Why does your tongue speak as if attached to the left temporal lobe itself? I catch glimpses of this reality you see. I feel myself drawn to it in longing for truth and understanding. For ...more
Nov 15, 2009 DJ marked it as to-read
Shelves: priority, physics
I have a suspicion that Penrose hasn't spoken to a undergraduate in 30 years. His notion of "introductory material" is not just wrong, its downright strange.

The famed mathematician devotes several pages to discussing the addition of fractions then breezes through holomorphic functions and Reimann spheres.

I'll return to this book in a year or two when I have the mathematical background to qualify as a "non-mathematician."
this book RULES. it is a sort of primer on the mathematics required to really understand quantum physics. of course, that is a pretty huge pile of stuff, and this is a damn huge book. it moves faaast too: the entire theoretical foundations of single-variable calculus takes up one chapter. the reader is rapidly pulled through pretty heavy cram sessions in multivariable calculus, algebraic topology, real analysis... everything you need! and yet, it does not feel at all dense, because roger penrose ...more
A feast for any physicist, or anyone who wants to learn the depth and beauty of physics, etc. as we know it. Not dumbed down at all. Throws every subject imaginable at you. If you can understand it, this book is truly amazing.

EDIT: I have recently learned in a conversation at uni that there are some controversies with the book and orthodox physics, most notably in the areas of string theory, Penrose's idea of twistors and the idea of more than 4 dimensions. However - considering how much else th
So we had a physicist around to dinner the other day and thrust this at him. I can't call T---- by his real name, let's just say he rhymes with a dip made with chickpeas and tahini. The reason I can't call him by his real name is that he works at a place that starts with C and rhymes with a complete lack of humour. He likes his job, I don't want to get him sacked for reading Penrose.

He flicks through it and the first thing I note is that physicists take about 5 nanoseconds to read what it takes
Amazing. While I can not exactly call Road to Reality a popularization of general relativity and quantum theory, it is a peerless introduction to and review of those topics. I have a PhD in mathematics, and studied physics and math as an undergraduate, and there was plenty for me to learn from this book. There are very few people in the world who would not learn much from reading it.

Many years ago, I read Penrose's Emporer's New Mind which was good as far as it went, but earned my derision with
This book is too sprawling to wait and review all at once at the end, so I've decided to do it little by little as I go along.

I thought the prologue sucked, but immediately after that it became deeply fascinating, so don't get discouraged. I guess I should say why I hated it, though. It seemed as though he was judging former times and societies through a "presentist" lens, as though all people have always and only been scientists since the start of time, only they were really bad at it back then
Vuka :3
wow... I actually managed to read it, 1050 pages, every single one of them.

But can I really say that I'm done with this book? I don't think so... Although it took me a year and a half to read it, I didn't even understand a significant part of it. Since I'm a physics student I understood most of it on some very basic level, but I'm pretty sure I'll have to open this book again and again to take a peek at some of the awesome ideas put here by Penrose.

Did I say awesome? That's a huge understatement
Rajesh Chepuri
Aug 21, 2007 Rajesh Chepuri rated it 5 of 5 stars
Recommends it for: physics: link to math, relativity, quantum mechanics
This is a great book. I have finished reading the first part i.e, math part of the book. It opened lot of windows for me in the world of mathematics. Though a computer graduate, I have lot of interest in physics. I have read lot of material on relativity but none gave me the the insight to it like this book. Before this book, I had no knowledge of non-eucildean geometry and its importance to physics. But now I know lot about Riemann and other great people's contribution.

The graphical presentatio
The story goes that Stephen Hawking was once told by a book publisher that every formula in his book would halve the amount of readers (or sales, almost the same thing, but not to a publisher). He was , of course, totally and utterly wrong. The Road to Reality contains about 1100 pages and, on average, there's about 9 formulas per page. That makes roughly 1000 formulas. According to this publisher's law, that would halve the sales a thousand times (2^(-1000)), so a rough estimate of the amount o ...more
Deciphering the laws of physics to create universal reality

This is an exhaustive review of the laws of physics as related to physical reality with significant emphasis on the mathematical component. The author is an outstanding mathematical physicist of our times, and in this book of 1100 pages, he describes the concept of space, time, and matter (energy) in terms of classical physics, quantum physics, string theory and its derivatives.

In physics, the behavior of objects is understood in terms
Yasiru (reviews will soon be removed and linked to blog)
As accurate a title as can be for this tremendously ambitious behemoth. I very much enjoyed the masterful laying of a mathematical framework when first I came across it (the first dozen or so chapters if memory serves; hence the rating, as well as for the aforementioned ambition in the task- I think this is a right way to go, though popular expositors seldom venture down this route), as Penrose does it so efficiently (and naturally too, so that the layman wouldn't shove it aside in disgust after ...more
Penrose examines the turn modern theoretical physics has taken in pursuit of multi-dimensional mathematical models to develop a unified model of the sub-atomic realm. His argument is not entirely mathematical, though he does have good arguments against unnecessary complexity from the point of view of the straightforward progress made by theoretical physics in discovering the mathematical elegance of relationships among various observed constants. His most profound argument against String Theory ...more
Feb 09, 2009 Michael rated it 5 of 5 stars
Recommends it for: Engineers, Teachers & Weird Guys
Recommended to Michael by: Some weird guy at the gym.
I desperately want to make it through this book. I might be crazy. I think part of my fascination with finishing it is to compensate for not finishing engineering school. I can tell you this... It would be a lot easier to read if I had attained my degree (and actually learned the material along the way). Nonetheless, this book opens in the most interesting and captivating fashion, which says a lot about a book that works to explain the universe by walking through the history of mathematics. A co ...more
This excellent, definitive work is not for the faint of heart of the weak of mathematics. You'll have finished most of the material for an undergraduate degree in math by the time you've worked your way through this: the first half of the book starts with Pythagorean number theory, complex number calculus, Riemann surfaces, Fourier decomposition, n-dimensional manifolds, Lie symmetry groups, and builds out from there. However, rich fruit is reaped in the second half of the book, which delves dee ...more
Hal Taylor
Many reviewers are harping on the mathematical density of this book as the cause of its failure. But, although I couldn't comprehend 90% of the math, I needed this book to lay out for me just what mathematical abstractions the great thinkers were capable of summoning to apply to their observations of physical phenomena. The presentation of these theories in all their opaque gritty detail 1) vividly demonstrates the astonishing cultural phenomenon of an animal species that has come to understand ...more
William Schram
This review has been hidden because it contains spoilers. To view it, click here.
Dec 05, 2011 Carlo marked it as to-read
Shelves: physics, astronomy
This book is way above my head. I'm gonna shelve it for a while and probably be back to it after some more readings in math. It is certainly not a layman's book, especially if you want to really understand the implications of Penrose's ideas. I have an engineering degree, and yet, from the second chapter on, I was sweating!
 SaЯRah Muhammad
This is an extraordinary book and certainly there is nothing else available on the market that is quite like it.

Penrose is a pre-eminent mathematician whose work has affected my own thinking in deep ways. Often I've discovered, to my surprise, that some viewpoint which I learned from another source in fact derived ultimately from Penrose himself, the author of this other source having been, as it turns out, a student of Penrose. As an example I offer "Visual Complex Analysis" by Tristan Needham.
One of the best mathematically complete but general and interesting physics books by one of the greatest of the field.
All you ever need to know.
Alex Lee
In this amazing book, Roger Penrose looks for a very fundamental issue.

He is looking for a single metric to describe everything.

This is not a unit of reality, however, although this is how he poses the issue.

The problem with selecting a metric, as he shows us over and over, lies in how different metrics arise from localizations on various manifolds. As these metrics are extended beyond the localization, the very structure of these metrics will threaten to buckle. In many instances, the metrics (
Lee Razer
Oct 16, 2014 Lee Razer marked it as to-read
Shelves: abandoned
Chapter 4. A complex number is of the form a+ib, where i is an imaginary number, the square root of -1. All regular rules of algebra apply to complex numbers, and it turns out that they govern the behavior of the universe at the tiniest scales. Very good. Illustration of the use of complex numbers in the convergence and divergence of power series, where for ex. 1+x^2+x^4+x^6+... = (1-x^2)^-1. Manually adding up some number of partial sums converges to the "answer" only where |x|<1; for |x|> ...more
John Haverkamp
75% of this book is above my head mathematically. But that's ok, because my arithmetic truncates at the 10 grade in 1987, so that's to be expected. What matter's is Mr. Penrose's clear presentation of advanced topics in physics, starting with the theoretical math which underlies them. He shows how the math often predates and thus opens the way for new physical theories. It is really refreshing how forthcoming the author is when presenting theories he either agrees or disagree with; always endeav ...more

This is a might be the best *children* book of our generation. Bear
with me. My favorite book when I was small was a some 1000 pages thick
encyclopedia of astronomy - and I am sure I am not the only who was
fascinated and inspired by a similarly mesmerizing and daunting
book. Full of strange pictures and even stranger ideas. Penrose's book
could be such a book for our kids. Do buy and keep it within easy
reach. Who knows?

LESS IMPORTANTLY (despite attempt still not really a factual rev
This is an audacious book, and a daunting read. Despite the months I spent working my way through it, I feel I barely scratched the surface, and I'm ill-equipped to really review it. A few random thoughts follow.

The book takes the refreshing (and unpopular amongst most pop-science books) view that the physics can't really be discussed without developing the necessary mathematical foundations, and it spends quite a lot of time introducing those mathematical subjects. That being said, it is probab
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Sir Roger Penrose OM FRS is an English mathematical physicist and Emeritus Rouse Ball Professor of Mathematics at the Mathematical Institute, University of Oxford and Emeritus Fellow of Wadham College. He has received a number of prizes and awards, including the 1988 Wolf Prize for physics which he shared with Stephen Hawking for their contribution to our understanding of the universe. He is renow ...more
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“We have a closed circle of consistency here: the laws of physics produce complex systems, and these complex systems lead to consciousness, which then produces mathematics, which can then encode in a succinct and inspiring way the very underlying laws of physics that gave rise to it.” 21 likes
“No doubt there are some who, when confronted with a line of mathematical symbols, however simply presented, can only see the face of a stern parent or teacher who tried to force into them a non-comprehending parrot-like apparent competence--a duty and a duty alone--and no hint of magic or beauty of the subject might be allowed to come through.” 9 likes
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