"The origin of the arrow of time is arguably the most important conceptual problem in cosmology, and the prospect that it can be solved in a universe where time flows 'backward' in the far past is as exciting as it is provocative. In this engaging book, Julian Barbour conveys this excitement admirably, complete with just a bit more detail than professional physicists usually share with the public."
—Sean Carroll, author of From Eternity to Here
"Julian Barbour's infectious enthusiasm for the big ideas in physics is addictive. He has a complete mastery of the history of ideas yet a remarkable lightness and clarity in explaining what are profound concepts. The Janus Point is controversial and gripping, an extraordinary introduction to his view of the universe."—Pedro G. Ferreira, author of The Perfect Theory
"By abandoning the prejudice that particles (atoms, stars...) are confined in a box, Julian Barbour has discovered an unexpected and remarkably simple feature of Newtonian dynamics. It is the basis of his seductive and eloquently presented explanation of the history of the universe, even time itself. Is his cosmology correct? 'Time' will tell."
—Michael Victor Berry, MelvilleWills Professor of Physics (Emeritus), Bristol University
"Julian Barbour has no peer when it comes to explaining scientific ideas in a way that is accessible without being simplistic. For good measure he has a talent for using quotes from Shakespeare and other literary sources in a manner that actually helps to elucidate key points. In The Janus Point he tackles subject matter that is notoriously challenging even to scientists, and explains it in a way that gave me new insights and understanding even though I studied these topics in a classroom a long time ago. This is a fitting sequel to his earlier work and helps to pull together several big ideas that some of us have been watching with fascination for decades."—Neal Stephenson, author of Snow Crash
"Julian Barbour is a profound and original
thinker, with the boldness to tackle some of nature's deepest problems. He is
also a fine writer, and this renders his book -- despite its conceptual
depth -- accessible to anyone who has pondered the mysteries of space and time.
It's a distillation of the author's prolonged investigations, and the insights
that he offers deserve wide readership."
—Martin Rees, author of On the Future
"Julian Barbour is well known for his brilliant study of physics history, The Discovery of Dynamics. The Janus Point includes a similar history of thermodynamics, statistical mechanics and the arrow of time. But for me the main point of the book was to show history-in-the-making. His 'shape dynamics' is a project to recast the foundations of all of cosmology, gravity, thermodynamics and the arrow of time. The book has given me a lot to ponder. As Gauss said of Riemann's habilitation lecture, '[it] exceeded my expectations.'"—Bill Unruh, professor of physics, University of British Columbia
"In this delightful,
provocative book, Julian Barbour shares his learned insights and passion about deep
questions of time, change, and the origin of the universe with all its
creative variety. A cosmic physics adventure, enlivened with history
—Theodore A. Jacobson, professor of physics, University ofMaryland