The accelerating universe pdf

Mario Livio est né le 19 juin 1945, astrophysicien israélo-américain et auteur d'ouvrages de vulgarisation des sciences et des mathématiques. Pendant 24 ans (1991-2015), il a été astrophysicien au Space Telescope Science Institute, qui exploite le télescope spatial Hubble. Il a publié plus de 400 articles scientifiques sur des sujets tels que la cosmologie, les explosions de supernova, les trous noirs, les planètes extrasolaires et l'émergence de la vie dans l'univers.[1] Son livre sur le nombre irrationnel phi, The Golden Ratio: The Story of Phi, the World's Most Astonishing Number (2002), a remporté le prix Peano et le prix international Pythagore pour les livres populaires sur les mathématiques.

The accelerating universe pdf par Mario Livio

The accelerating universe: infinite expansion, the cosmological constant, and the beauty of the cosmos. In one of the most surprising and important findings in cosmology in the century, astronomers recently discovered that the unierse 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 some 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.