The Accelerating Universe. Infinite Expansion, The Cosmological Constant, And The Beauty Of The Cosmos

"If nature were not beautiful, it would not be worth knowing and life would not be worth living." - Jules Henri Poincaré In one of the most surprising and important findings in cosmology in the century, astronomers recently discovered that the universe may be expanding at an ever-increasing rate. This discovery of an "accelerating universe" stunned many cosmologists because it directly contradicts their most deeply held beliefs about the evolution and fate of the universe. The discovery has therefore ignited a new revolution in cosmology in which scientists are wrestling anew with the most fundamental questions and revisiting ideas that were dismissed long ago. As leading astrophysicist Mario Livio explains in this elegantly written and timely book, most cosmologists have long believed that the universe will expand at a gradually decreasing rate until the expansion effectively stops. In this pleasing scenario, the universe is perfectly poised between expanding into oblivion or collapsing in a "big crash" and will continue on in this miraculously balanced state for eternity. The discovery that the expansion appears in fact to be speeding up-and therefore that the universe will keep expanding faster and faster for infinity-throws the view of a perfectly balanced "beautiful universe" into question. Even more troubling, it threatens the cherished belief that the fundamental laws governing the cosmos are in themselves exquisitely "beautiful," a belief that has always been a guiding light of discovery in cosmology. What can explain this accelerated expansion? Does the universe have much less mass than originally thought? Is there sortie exotic unknown force, or new kind of energy, causing acceleration? Was Einstein's "greatest blunder"-his idea of a cosmological constant-the right idea after all? What will the ultimate fate of the universe be? Must there be beauty in all good theories of the cosmos? Or are some of the laws governing the universe "ugly"? In an entertaining and lively exploration of the answers to all of these questions, Mario Livio introduces readers to the "old cosmology," which culminated in the view of the perfectly balanced universe, and then presents all of the ideas being explored by cosmologists in the "new cosmology" as they come to terms with the discovery of acceleration. Offering extraordinarily clear explanations of all the key concepts and theoretical ideas, Livio is a marvelous guide through this most exciting frontier in science today. "The Accelerating Universe is not only an informative book about modern cosmology. It is rich storytelling and, above all, a celebration of the human mind in its quest for beauty in all things." - Alan Lightman, author of Einstein's Dreams "This is a wonderfully lucid account of the extraordinary discoveries that have made the last years a golden period for observational cosmology. But Mario Livio has not only given the reader one clear explanation after another of what astronomers are up to, he has used them to construct a provocative argument for the importance of aesthetics in the development of science and for the inseparability of science, art, and culture." - Lee Smolin, author of The Life of the Cosmos "What a pleasure to read! An exciting, simple account of the universe revealed by modern astronomy. Beautifully written, clearly presented, informed by scientific and philosophical insights. " - John Bahcall, Institute for Advanced Study "A book with charm, beauty, elegance, and importance. As authoritative a journey as can be taken through modern cosmology." - Man Sandage, Observatories of the Carnegie Institution of Washington