Roger Penrose  The Road to Reality
Roger Penrose: The Road to Reality: A Complete Guide to the Laws of the Universe, Pub: Jonathon Cape, 29 July 2004 (UK)/Knopf, Feb 2005 (US), 1094 pages
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"Professional scientists cannot accuse Mr. Penrose of dumbingdown the science, and the author's prose is so lucid the reader can grasp his point even when the mathematics fly overhead."  Michael Shermer, NY Sun review
The Road to Reality by Roger Penrose is 1094 pages long, and provides a comprehensive account of our present understanding of the physical universe, and its underlying mathematical theory.
This page aims to be a comprehensive resource. Bookmark it, and check back for the latest interviews, reviews, comments, and threads.
Claim to Fame
Roger Penrose has worked in many areas of mathematical physics and cosmology, but is perhaps most famous for his collaboration with Stephen Hawking. Together, they proved that, in the mathematical model of general relativity, our universe was originally contained within a sphere of zero radius. That is, all space and matter was contained within a point called a singularity. They also proved that space, time and matter had a beginning in what is called the big bang.
Penrose holds the most respected chair in mathematics at Oxford, just as Hawking holds the most respected chair at Cambridge. Stephen Hawking's A Brief History of Time and The Universe in a Nutshell introduced mathematical physics without using equations, and kept things simple. If you want equations, and more depth, then The Road to Reality by Roger Penrose is a must buy.
Mathematics
This book provides the mathematical background needed for understanding physical theories through the same equations that theoretical physicists use in their everyday work. The aim is to convey a detailed overall understanding  a feeling for the deep beauty and philosophical connotations of the subject, as well as of its intricate logical interconnections.
It's a challenging read, but there is enough descriptive material to carry the less mathematically inclined reader through, as well as some 450500, mostly handdrawn, figures. The book provides a feeling for all the key issues and deep current controversies, and counters the common complaint that the details of cuttingedge science are fundamentally inaccessible.
The topics covered include: the roles of different kinds of numbers and geometry in
physics; the ideas  and magic  of calculus; notions of
infinity; the physics and mathematics of relativity theory; the foundations and
controversies of quantum mechanics; the standard model of particle physics;
cosmology; the big bang; black holes; the profound challenge of the second law
of thermodynamics; string and M theory; loop quantum gravity; twistors; fashions
in science; and new directions.
Escher's Circle Limit 1 represents the conformal hyperbolic plane, and is used by Roger Penrose to illustrate his favourite mathematical model of the universe. It's just one of 450500 pictures in the book.
Quote from the book
Knowing where to find things is as important as knowing things. Here's a quote on this idea worth the price of the book:
"There is one major breakthrough in 20th century physics that I have yet to touch upon, but which is nevertheless among the most important of them all! This is the introduction of arXiv.org, an online repository where physicists and mathematicians, biologists and computer scientists can publish preprints (or 'eprints') of their work before (or even instead of!) submitting to journals."
Quote from the Scotsman review
"Is [The Road to Reality] the most important science book of the
century? We had better wait until 2099 to find out  but I am sure Roger Penrose would
be the first to say no. His greatest hope is that there is some young person out
there...who will do for our century what Einstein did for the last, and who will
clear up the mysteries that Penrose, Hawking, Witten and so many others have
been unable to solve.
The Road To Reality ends with such a vision; and if it comes to fruition then
this book will one day seem little more than a historical curiosity. In that
case it will have succeeded  so letâ€™s hope it goes on library shelves
everywhere and finds its way into the hands of the next Einstein, wherever he or
she may be."
 Andrew
Crumey