Why do we remember the past, but not the future? Why don't we meet people who grow younger as they age? Why do things, left by themselves, tend to become messier and more chaotic? What would Maxwell's Demon say to a Boltzmann Brain?The answers can be traced to the moment of the Big Bang -- or possibly before.
From Eternity to Here examines the arrow of time: why the past is different from the future. It's an easy question to ask, much harder to answer. The solution lies in the behavior of entropy, a measure of disorder, which tends to increase according to the celebrated Second Law of Thermodynamics. But why was entropy ever small in the first place? That's a question that has been tackled by thinkers such as Ludwig Boltzmann, Stephen Hawking, Richard Feynman, Roger Penrose, Alan Guth, and Sir Arthur Eddington, all the way back to Lucretius in ancient Rome. But the answer remains elusive.
The only way to understand the origin of entropy is to understand the origin of the universe -- by asking what happened at the Big Bang, and even before the Big Bang. From Eternity to Here discusses how entropy relates to black holes, cosmology, information theory, and the existence of life. The book tells a story that starts in the kitchen, where we can turn eggs into omelets but never the other way around, and takes us to the edges of the universe. Modern discoveries in cosmology -- dark energy and the accelerating universe -- and quantum gravity -- the possibility of time before the Big Bang -- come together to suggest a picture of a multiverse in which the arrow of time emerges naturally from the laws of physics
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Sean Carroll is a theoretical physicist at the California Institute of Technology. He received his Ph.D. from Harvard in 1993, and worked at MIT, the Institute for Theoretical Physics at UC Santa Barbara, and the University of Chicago before moving to Caltech. His research involves theoretical physics and astrophysics, focusing on issues in cosmology, field theory, and gravitation. He is the author of Spacetime and Geometry, a graduate-level textbook on general relativity; has produced a set of introductory lectures for The Teaching Company entitled Dark Matter and Dark Energy: The Dark Side of the Universe; and blogs regularly at Cosmic Variance. His lives in Los Angeles with his wife, science writer Jennifer Ouellette.
