Endless Universe: Beyond the Big Bang (Anglais) Broché – 11 décembre 2008
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He was moving through a new order of creation of which few men ever dreamed. Beyond the realms of sea and land and air and space lay the realms of fire, which he alone had been privileged to glimpse. It was much too much to expect that he would also understand.
—Arthur C. Clarke, 2001: A Space Odyssey
Two boys sit in darkened cinemas, one in London and one in Miami, set to watch Stanley Kubrick's movie 2001: A Space Odyssey. It is 1968, a year of worldwide conflict and turmoil: Vietnam, the arms race, political assassinations, student protests, and rebellions. But all this is forgotten as the film sweeps the boys along in a glorious tale of science, space, and the future.
The boy in Miami witnessed firsthand the awesome power of technology to annihilate or inspire. Six years earlier, from his home near Homestead Air Force Base, he watched missiles being prepared for a strike on Cuba, knowing that his family and community would be obliterated if the looming crisis led to a nuclear exchange. Then, as the crisis subsided, he became galvanized by John F. Kennedy’s promise to send a man to the Moon by the end of the decade. He emerged from these early experiences optimistic about the power of technology to improve the future and fascinated by all things scientific. He kept logbooks of every manned mission and traveled often to Cape Canaveral to observe the launches. He turned the family garage into a laboratory with large stocks of chemicals and biological specimens. And he headed to the Everglades at night, avoiding the city lights and fending off mosquitoes, to take a peek at the heavens through his telescope.
The boy in London was a refugee from South Africa, where his parents had been imprisoned for resisting the oppressive apartheid regime. But he too was optimistic, having seen the determination of people like Nelson Mandela to build a better future. Upon his parents’ release, the family had left South Africa for Kenya and then Tanzania, new countries full of natural wonders—the Serengeti’s wild animals and the Olduvai Gorge, home of the earliest humans. Under the hot African sun the boy had learned mathematics and science from spirited young teachers. He’d built electric motors, made explosions, and watched ant lions for hours. In 1968 his family had moved to England for the sake of the children's education, arriving in time to watch the Apollo moon landings on TV.
As young children, both boys had acquired their passion for science from their fathers. Each night, the father in America told stories to his little boy of Marie Curie, Louis Pasteur, and other great discoverers. The father in Africa patiently explained the Pythagorean theorem and spoke of the great achievements of ancient Greek science. Their words were like water on seeds, feeding insatiable curiosities. How does the world work? How did it start out? Where is it headed? The boys asked the same questions that have gripped people from every society, every culture, every religion, and every continent since civilization began.
Kubrick’s film speaks of a time in the foreseeable future when people will devote their skills and resources to uncovering the secrets of the universe. A space mission is dispatched to investigate a powerful signal emanating from one of Jupiter’s moons. Technology, in the form of the computer HAL, threatens to end the mission, but human ingenuity and adaptability win out. A lone surviving astronaut arrives to find a giant monolith, appearing like a solid rock two thousand feet high. As he approaches, he realizes that it’s actually the opening of an infinite shaft, drawing him into a transdimensional trip through hyperspace and revealing the creation and the future of the universe. Watching the film, neither boy realizes how prophetic this story might be.
A Real Space Odyssey
Fast–forward to the real 2001: rather than a lone astronaut, a worldwide community of cosmologists engaged in an intense effort to understand the beginning of the universe. The two of us, now grown, are thrilled to be among them. The boy in Miami, Paul Steinhardt, is now a professor of mathematical physics at Princeton University. The boy in London, Neil Turok, is a professor of physics at Cambridge University in England. Each of us, following his own path, has pursued his dream of becoming an explorer of the universe, albeit with paper and pencil instead of a rocketship. Three years have passed since the two of us joined forces on a risky venture to investigate a new, transdimensional view of space and time that challenges the conventional history of the universe.
Cosmologists celebrate 2001 as the year the U.S. National Aeronautics and Space Administration (NASA) launched a satellite mission from Cape Canaveral to investigate not the black monolith of Kubrick’s film but a thin, dark layer of space at the outermost edge of the visible universe. The mission is called WMAP (pronounced “W-map,”), which stands for Wilkinson Microwave Anisotropy Probe. On board is a bank of highly sensitive detectors designed to gather some of the ancient light emitted from the dark layer nearly 14 billion years ago, at a time when the first atoms were just beginning to form. Every 2.2 minutes, the satellite spins once around its axis, and every hour the axis itself traces out a circle. From the combination of motions, light from a narrow ring on the sky is collected. Over the course of six months, the entire satellite keeps shifting, until the detectors have covered the entire sky. The sequence will be repeated every six months until enough light has been gathered to make a detailed portrait of the infant universe. (WMAP is a follow–up to the pioneering NASA satellite launched in 1989 called COBE, the Cosmic Background Explorer, which had made an initial low–resolution image of the early universe; in 2006, the leaders of the COBE team, John Mather at the NASA Goddard Space Flight Center and George Smoot at the University of California at Berkeley, were awarded the Nobel Prize in Physics.)
Nineteen months after the WMAP launch, in February 2003, mission head Charles Bennett and his team had collected and analyzed sufficient light to announce their initial findings at NASA’s Washington headquarters, in a press conference broadcast throughout the world. One of us watched in an auditorium at Princeton University, overflowing with what seemed like everyone in town, from mailroom clerks to middle–school students, drawn by rumors of a great new discovery. The other was in a similarly packed lecture room in Cambridge, England. The sense of anticipation was tremendous, each crowd aware that its understanding of the origin and evolution of the universe would hinge on what the WMAP team had found.
At last, Bennett and his team unveiled the image that had emerged after a yearlong exposure. Just like the fictional astronaut peering into the monolith, the WMAP satellite had gazed into the primordial layer and obtained the first clear view of the infant universe. What the greatest thinkers in history—from Plato to Newton to Einstein—could only speculate about was suddenly there for all to see, bringing humanity closer to answering the ultimate question: Where did it all come from?
At the end of the broadcast, world-renowned astrophysicist John Bahcall summarized the sentiments of the scientists watching: “Every astronomer will remember where he or she was when they first heard the WMAP results. For cosmology, the announcement today represents a rite of passage from speculation to precision science.” Bahcall’s point was that not only are the measurements marvelously accurate, but they are also in astonishing agreement with what cosmologists had been expecting.
By the time of the WMAP announcement, most scientists had come to accept a cosmological theory known as the inflationary model of the universe. In scientific discussions, “model” is often used to mean “theory,” especially cases where the idea includes aspects that are qualitative or incomplete. The inflationary model, as the term is used today, refers to a combination of three concepts: the hot big bang model, developed in the early twentieth century; the inflation mechanism, introduced in the 1980s; and the dark energy hypothesis, added in the 1990s.
In this picture, the big bang itself is not explained. It is simply imagined that space and time emerged somehow. Next, it is assumed that just after the bang, a small region of the universe underwent a dramatic process called inflation, during which it expanded a googol (10 raised to the 100) times or more within a billionth of a billionth of a trillionth (10 raised to the negative 30) of a second. Once this period of inflation ended, the energy causing the inflation was transformed into a dense gas of hot radiation. The gas cooled and the expansion slowed, allowing atoms and molecules to clump into galaxies and stars. This picture of an inflationary universe was originally conceived in the 1980s and is now presented in many textbooks. However, recent astronomical discoveries have led to a major amendment to the story—that 9 billion years after the big bang, a mysterious force called dark energy took over and started to accelerate the expansion again. In the standard picture, the expansion of the universe will accelerate forever, turning all of space into a vast and nearly perfect vacuum.
Both of us had been cosmologists for over two decades by the time of the WMAP announcement, and each had played a part in building the case for the leading view of the universe. In the 1980s, Paul was one of the architects of the original inflationary theory. A decade later, he and his Princeton University colleague Jeremiah Ostriker were among the first to incorporate dark energy into the big bang model. They showed that, assuming a particular mixture of matter and dark energy today, it is pos... --Ce texte fait référence à une édition épuisée ou non disponible de ce titre.
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—Sir Martin Rees, Astronomer Royal and President of the Royal Society, author of Before the Beginning
“Paul Steinhardt and Neil Turok, two architects of modern cosmology, have written an accessible and engaging account of their exciting new theory of cosmic origins. Should their approach someday be confirmed, it would result in a major upheaval to our understanding of how everything—space, time, and matter—came to be.” —Brian Greene, author of The Elegant Universe and The Fabric of the Cosmos
"For the past twenty years, the combination of the big bang theory plus inflation has offered cosmologists an unbeatable one-two knockout punch . . . But the standard model finally has a worthy challenger."
—Robert Naeye, Mercury
“Perhaps you don’t believe in strings, or extra spatial dimensions, or D-branes, or that the universe’s accelerated expansion may someday reverse. But I urge you to suspend such views and read Steinhardt and Turok’s dramatic and very readable account of their cyclic model of the universe. It may well be closer to truth than you think!”
—Sir Roger Penrose, Rouse Ball Professor of Mathematical Physics at Oxford University, author of The Emperor’s New Mind and The Road to Reality: A Complete Guide to the Laws of the Universe
“The authors manage to make complicated concepts such as the cosmic microwave background understandable.”
—The Wall Street Journal
“Steinhardt and Turok are eloquent in describing how theoretical physicists puzzle through cosmic problems.”
—Laurence Marschall, Discover
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