The Inflationary Universe: The Quest For A New ...
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Amazon.comFind in a libraryAll sellers _OC_InitNavbar({\"child_node\":[{\"title\":\"My library\",\"url\":\" =114584440181414684107\\u0026source=gbs_lp_bookshelf_list\",\"id\":\"my_library\",\"collapsed\":true},{\"title\":\"My History\",\"url\":\"\",\"id\":\"my_history\",\"collapsed\":true},{\"title\":\"Books on Google Play\",\"url\":\" \",\"id\":\"ebookstore\",\"collapsed\":true}],\"highlighted_node_id\":\"\"});The Inflationary Universe: The Quest for a New Theory of Cosmic OriginsAlan H. GuthVintage, 1998 - Big bang theory - 358 pages 1 ReviewReviews aren't verified, but Google checks for and removes fake content when it's identifiedThe classic Big Bang theory describes what happened after the bang. Guth looks at the questions the theory can't answer, such as - if matter can neither be created or destroyed, how could so much matter arise from nothing at all What people are saying - Write a reviewReviews aren't verified, but Google checks for and removes fake content when it's identifiedUser Review - Flag as inappropriateI've owned this book since 1998 & it remains a source of inspiration into the early mechanisms of the inflationary model of the universe and why it looks and behaves the way it does in respect to galactic evolution and possible fate of the universe. Fascinating does not say enough or do the book justice.
The Inflation Theory, developed by Alan Guth, Andrei Linde, Paul Steinhardt, and Andy Albrecht, offers solutions to these problems and several other open questions in cosmology. It proposes a period of extremely rapid (exponential) expansion of the universe prior to the more gradual Big Bang expansion, during which time the energy density of the universe was dominated by a cosmological constant-type of vacuum energy that later decayed to produce the matter and radiation that fill the universe today.
That's not what I'm going to talk about. I want to talk about the conventional inflationary picture, and in particular the great boost that this picture has attained over the past few years by the somewhat shocking revelation of a new form of energy that exists in the universe. This energy, for lack of a better name, is typically called \"dark energy.\"
But let me start the story further back. Inflationary theory itself is a twist on the conventional Big Bang theory. The shortcoming that inflation is intended to overcome is the basic fact that, although the Big Bang theory is called the Big Bang it is in fact not really a theory of a bang at all; it never was. The conventional Big Bang theory, without inflation, was really only a theory of the aftermath of the Bang. It started with all of the matter in the universe already in place, already undergoing rapid expansion, already incredibly hot. There was no explanation of how it got that way. Inflation is an attempt to answer that question, to say what \"banged,\" and what drove the universe into this period of enormous expansion. Inflation does that very wonderfully. It explains not only what caused the universe to expand, but also the origin of essentially all the matter in the universe at the same time. I qualify that with the word \"essentially\" because in a typical version of the theory inflation needs about a gram's worth of matter to start. So, inflation is not quite a theory of the ultimate beginning, but it is a theory of evolution that explains essentially everything that we see around us, starting from almost nothing.
There are two primary predictions that come out of inflationary models that appear to be testable today. They have to do (1) with the mass density of the universe, and (2) with the properties of the density non-uniformities. I'd like to say a few words about each of them, one at a time. Let me begin with the question of flatness.
The most recent data set was made by an experiment called the Cosmic Background Imager, which released a new set of data in May that is rather spectacular. This graph of the spectrum is rather complicated because these fluctuations are produced during the inflationary era, but then oscillate as the early universe evolves. Thus, what you see is a picture that includes the original spectrum plus all of the oscillations which depend on various properties of the universe. A remarkable thing is that these curves now show five separate peaks, and all five of the peaks show good agreement between theory and observation. You can see that the peaks are in about the right place and have about the right heights, without any ambiguity, and the leading peak is rather well-mapped-out. It's a rather remarkable fit between actual measurements made by astronomers, and a theory based on wild ideas about quantum fluctuations at 10-35 seconds. The data is so far in beautiful agreement with the theory.
At the present time this inflationary theory, which a few years ago was in significant conflict with observation now works perfectly with our measurements of the mass density and the fluctuations. The evidence for a theory that's either the one that I'm talking about or something very close to it is very, very strong.
Amazon FranceTrouver en bibliothèqueTous les vendeurs _OC_InitNavbar({\"child_node\":[{\"title\":\"Ma bibliothèque\",\"url\":\" =114584440181414684107\\u0026hl=fr\\u0026source=gbs_lp_bookshelf_list\",\"id\":\"my_library\",\"collapsed\":true},{\"title\":\"Mon historique\",\"url\":\"\",\"id\":\"my_history\",\"collapsed\":true},{\"title\":\"Livres sur Google Play\",\"url\":\" \",\"id\":\"ebookstore\",\"collapsed\":true}],\"highlighted_node_id\":\"\"});The Inflationary Universe: The Quest For A New Theory Of Cosmic OriginsAlan GuthBasic Books, 8 mai 1997 - 358 pages 0 AvisLes avis ne sont pas validés, mais Google recherche et supprime les faux contenus lorsqu'ils sont identifiés\"The classic big bang theory is great at describing what happened after the bang. Yet until recently, particle physicists and cosmologists were stuck on many questions that the big bang theory couldn't answer, including: What made the big bang BANG in the first place If matter can be neither created nor destroyed, how could so much matter arise from nothing at all Why can we only see a minute part of the mega-universe\" \"In 1979, a young particle physicist named Alan Guth answered these questions and made front-page news with one of the greatest discoveries in modern cosmology: cosmic inflation. This is the compelling, first-hand account of Guth's paradigm-breaking discovery of the origins of the universe; and it is a fascinating chronicle of his dramatic struggle to justify it.\" \"Guth's startling theory states that in the billion-trillion-trillionth of a second before the big bang, there was a period of hyper-rapid \"inflation\" that got the big bang started. Inflation modifies our picture of only the first small fraction of a second in the history of the universe, and then it joins onto the standard big bang theory, preserving all of the successes of the older theory. But because inflation explains the bang itself, it is a much richer theory than the older versions of the big bang.\"--BOOK JACKET.Title Summary field provided by Blackwell North America, Inc. All Rights Reserved Avis des internautes - Rédiger un commentaireLes avis ne sont pas validés, mais Google recherche et supprime les faux contenus lorsqu'ils sont identifiésThe inflationary universe: the quest for a new theory of cosmic originsAvis d'utilisateur - Not Available - Book VerdictIn late 1979, Guth developed concept of the \"inflationary universe,\" proposing that, very soon after the Big Bang, the tightly packed mass that constituted the universe underwent an exceptionally ... Consulter l'avis complet
The inflationary universe scenario postulates that at some time in the very early history of the universe a period of extremely rapid (superluminal) expansion occurred. Inflation is probably the single most important idea to arise in scientific cosmology since the early 1960s, when the foundations of modem big bang cosmology were laid. It potentially explains several observed features of the universe for which there is no other known explanation, as will be discussed below. The best ideas on why inflation might occur are inspired by exotic but established concepts of modem particle physics. Indeed, a period of inflation can be triggered by phase transitions of the sort that are predicted by particle physics models to occur under extreme conditions of temperature and density, such as occurred close to the big bang.
The intellectual origin of the inflationary universe scenario can be traced, with a precision unusual for modem science, to a specific date and author. On 6 December 1979 the author of the book under review, Alan Guth, realized that the models of particle physics he was analyzing for other purposes could, under reasonable assumptions, trigger an inflationary epoch. Equally important, he realized that the occurrence of such an epoch would answer some major cosmological riddles. There were partial anticipations before, and many refinements and applications were added later, but clearly Guth's contribution was the central one. Moreover, he is an exceptionally lucid and painstaking writer. It is uniquely fitting, therefore, that he should present this subject to the general public.
This scenario provides explanations for some puzzles in cosmology: why the universe is so large, why it is so uniform, and why it is so nearly flat (scientists can not detect the large-scale spatial curvature effects associated with general relativity). Most importantly, this scenario provides an explanation for the origin of large-scale structure in the universe: Clusters of galaxies arise from seed perturbations generated by quantum fluctuations in the very early universe, amplified vastly in size by the inflationary expansion of the universe and in amplitude by gravitational instability after the decoupling of matter and radiation. A major triumph of the theory is that the subtle variations in the cosmic background radiation it predicted have been observed from satellites and balloons. 59ce067264
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