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Quantum: Einstein, Bohr and the Great Debate About the Nature of Reality (Anglais) Broché – 2 avril 2009

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Quantum For most people, quantum theory is a byword for mysterious, impenetrable science. And yet for many years it was equally baffling for scientists themselves. This work presents the history of this fundamental scientific revolution. It focuses on the conflict between Einstein and Bohr over the nature of reality and the soul of science. Full description

Détails sur le produit

  • Broché: 464 pages
  • Editeur : Icon Books Ltd (2 avril 2009)
  • Langue : Anglais
  • ISBN-10: 1848310358
  • ISBN-13: 978-1848310353
  • Dimensions du produit: 12,9 x 3 x 19,8 cm
  • Moyenne des commentaires client : 4.0 étoiles sur 5  Voir tous les commentaires (4 commentaires client)
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4 internautes sur 4 ont trouvé ce commentaire utile  Par jppedberg le 11 février 2014
Format: Format Kindle Achat vérifié
Absolument remarquable, peut-être la meilleur introduction à l'histoire de la théorie des quanta et, qui plus est, se lit comme un roman.
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A missed opportunity. The book tells the story of the development of the Quantum theory through the angle of the contributions, either direct or indirect, of, primarily, Einstein and to a lesser degree of Wolfgang Pauli. Their extraordinary contributions, along with those of the other pioneering phyiscists and friends, deserved a more objective presentation, not an apology.
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Je l'ai téléchargé avec l'app Kindle de mon iPad.

Ouvrage historique sérieux, bien construit et bien documenté. Passionnant autant qu'instructif.

Vocabulaire un peu recherché qui m'a parfois obligé à recourir au dictionnaire anglais: j'ai donc apprécié le dictionnaire intégré dans l'app Kindle.
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Par DCM le 25 septembre 2014
Format: Format Kindle Achat vérifié
Se lit comme un roman. On y découvre les cheminements intellectuels de ces grands noms, leurs doutes et leurs ambitions. Très bien écrit, dans un anglais agréable, on le lit comme du début à la fin avec grand plaisir.
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171 internautes sur 175 ont trouvé ce commentaire utile 
A brilliant account of a fundamental subject 11 juin 2009
Par Louis Ryan - Publié sur Amazon.com
Format: Relié
The development of quantum physics through the 20th century is one of the great adventures of science, and here at last is a book aimed at the layperson which clearly explains its key concepts, while situating the scientific development in its broader setting. The result is a challenging and enthralling read.

Quantum is appropriately sub-titled, Einstein, Bohr and the Great Debate about the Nature of Reality. The long theoretical duel between these two giants of modern physics is a recurring theme of the book, but the story starts before them with the build-up to the discovery of Planck's constant at the turn of the century, and continues beyond their deaths (in 1955 and 1962 respectively) to take in Bell's Theorem and Everett's "many worlds" interpretation. Along the way we meet other great physicists such as Rutherford, Heisenberg, Pauli, Schrödinger, Dirac and Bohm.

One might suspect that a book of such scope would be in danger of being overcrowded with theories and theorists, yet Kumar rises to the challenge, displaying a novelist's sense of pacing allied with an impressive scientific clarity and succinctness. Clearly he has taken to heart the famous injunction attributed to Einstein to "make it as simple as possible, but no simpler!" He also strikes a judicious balance between scientific explanation and human context. This provided for me a welcome alternation between the physics and the lives of the physicists, with each stimulating an interest in the other.

What is so powerful and inspiring about this book is the way it conveys the passion for truth of those great pioneers. No doubt ego played its part as well, they would hardly have been human otherwise, but it is always secondary to the great quest to fathom the nature of sub-atomic reality. Characteristic of this passion is the anecdote of Bohr and Einstein on their first meeting in Copenhagen, straightaway so engrossed in debate that they repeatedly miss their bus-stop. Kumar evidently resonates to this passion, and conveys it vividly in his narrative. Here is an extract from his account of Bohr's first meeting with Schrödinger, one of Einstein's key allies in the great debate:

"After the exchange of pleasantries, battle began almost at once, and according to Heisenberg, `continued daily from early morning until late at night'... During one discussion Schrödinger called `the whole idea of quantum jumps a sheer fantasy'. `But it does not prove there are no quantum jumps,' Bohr countered. All it proved, he continued, was that `we cannot imagine them'. Emotions soon ran high... Schrödinger finally snapped. `If all this damned quantum jumping were really here to stay, I should be sorry I ever got involved with quantum theory.' `But the rest of us are extremely grateful that you did,' Bohr replied, `your wave mechanics has contributed so much to mathematical clarity and simplicity that it represents a gigantic advance over all previous forms of quantum mechanics.'

"After a few days of these relentless discussions, Schrödinger fell ill and took to his bed. Even as his wife did all she could to nurse their house-guest, Bohr sat on the edge of the bed and continued the argument. `But surely Schrödinger, you must see...' He did see, but only through the glasses he had long worn, and he was not about to change them for ones prescribed by Bohr."

This book is a brilliant and compelling account of the genesis of quantum physics, but it is more than that. In the midst of today's pervasive cynicism and disorientation, it is an inspiring reminder of what the human spirit is capable of when it devotes itself passionately to the highest aim, that of understanding the truth of our reality.
93 internautes sur 99 ont trouvé ce commentaire utile 
The entanglement of classical and quantum realities 11 décembre 2008
Par Rama Rao - Publié sur Amazon.com
Format: Relié
The great Einstein-Bohr debate about physical reality is interesting not only to physicists, but also to great many readers interested in understanding the nature. This discussion between Bohr and Einstein over the interpretation of quantum theory began in 1927 at the fifth Solvay Conference. The debate over the ability of quantum theory to describe nature was fueled by many leading physicists of the time, some of whom directly contributed to the development of quantum physics, but later found themselves arguing against the theory they helped to create. Notable examples include Erwin Schrodinger, Paul Dirac, and Max Planck; the latter two did not actively participate in challenging the quantum reality. Bohr and Einstein spent many years intensely debating the nature of reality, and their discussions are known for very famous Einstein's comments such as; "God does not play dice,' or "God is slick, but he ain't mean," and Bohr's response was "don't bring God into this (discussion of quantum physics)." Bohr argued vigorously against both deterministic and realistic world, but Einstein was equally adamant to defend these two physical and philosophical concepts. Deterministic philosophy was spurred by Newtonian mechanics; if we know a system and its physical properties (size, color, or position) at one point in time, then at some point in future we can predict the system based on these physical properties. Bohr argued that complete knowledge of the present can result only in a description of what the future most probably will be like, but there is no such thing as certainty in quantum world. This thought is mystified by what is commonly called Copenhagen interpretation, and its strong proponents were Niels Bohr, Werner Heisenberg, and Max Born. Classical reality envisioned by Einstein was supported to a certain level by Schrödinger. Recent historical research shows that Paul Dirac had his own doubts about Copenhagen school of thought (1), and Max Planck, the founding father of quantum physics, lived until 1947 did not participate directly in Einstein-Bohr debate because of his own insecurities about quantum reality. When experimental test for Bell's inequality was conducted by Alain Aspect and others, many thought that Einstein was definitely wrong, but recent advances say, not so fast. Physicist Roger Penrose and many others believe that quantum physics is an incomplete theory (2). Few weeks ago when Large Hadron Collider (LHC) conducted test runs, Stephen Hawking expressed pessimism of finding Higgs Boson in LHC experiments by stating that "I think it will be much more exciting if we don't find the Higgs. That will show something is wrong, and we need to think again. I have a bet of 100 dollars that we won't find the Higgs." In a poll conducted in 1999 at Cambridge University, 55% of physicists polled for none of the existing quantum interpretations are right. This shows that not everything is settled in quantum physics.

History of quantum physics is the best example to understand how scientists work. Their collective efforts to understand the universe we live in through publications, conferences, discussions correspondence and collaborative efforts are essential to scientific advancement. The author describes these things well in the book, but he falls short in certain areas; his current work uses previously published works of Max Jammer (3), Jagdish Mehra and Helmut Rechenberg (4) as his few sources of information, but he could have researched a little more by talking to people who were directly associated with Einstein or Bohr. In a recent book by Louisa Gilder (5), after interviewing a colleague of Boris Podolsky, she reported that Rosen or Podolsky never asked Einstein for his permission when they published the classic Einstein, Podolsky and Rosen paper, 'Can Quantum Mechanical Description of Physical Reality Be Considered Complete." It is also stated elsewhere that Einstein never thought this was going to be a paper; the ideas came out during informal discussions (6). The author discusses the results of crucial experiments such as tests of Bell's theorem, and other work that may have lead to confusions or mistakes.

Many who are familiar with the history of quantum physics think that even though Einstein is unquestionably the best scientist mankind has ever seen but they also believe that he was grumpy old man who did not appreciate new and novel ideas in physics. This is certainly not true according to physicists who knew him. He helped Max Planck in the development of early ideas such as quantized energy levels in quantum physics. Einstein was not against new ideas such as the probabilistic or statistical interpretation of quantum mechanics, but the denial of an independent reality bothered him immensely. This lead to another famous quote from Einstein: "I think that a particle must have a separate reality independent of the measurements. That is an electron has spin, location and so forth even when it is not being measured. I like to think that the moon is there even if I am not looking at it." The author resurrects these ideals of Einstein hastily when he discusses experimental tests of Bell's theorem. He concludes that Einstein's doubts about the completeness of quantum mechanics are vindicated.

1. Alisa Bokulich, Paul Dirac and the Einstein-Bohr Debate. Perspectives on Science 2008, vol. 16, no. 1, pages 103-114.
2. Spirituality and the Nature of Reality - A discussion between Roger Penrose and T. D. Singh, Published by Bhaktivedanta Institute, 2007 (ISBN: 8190136976)
3. The conceptual development of quantum mechanics (International series in pure and applied physics)
4. The Historical Development of Quantum Theory. 7 book set. Vol.1, Parts 1 and 2. V.2, V.3, V.4, and V.5, Parts 1 and 2
5.The Age of Entanglement: When Quantum Physics Was Reborn
6. Schrodinger's Kittens and the Search for Reality: Solving the Quantum Mysteries Tag: Author of In Search of Schrod. Cat
7. Schrödinger: Life and Thought
8. Einstein, Bohr and the Quantum Dilemma: From Quantum Theory to Quantum Information
9. SPOOKY PHYSICS: A Brief Introduction to the Einstein-Bohr Debate (Neural Library)
10. When champions meet: Rethinking the Bohr-Einstein debate [An article from: Studies in History and Philosophy of Modern Physics]
11. Uncertainty: Einstein, Heisenberg, Bohr, and the Struggle for the Soul of Science
53 internautes sur 56 ont trouvé ce commentaire utile 
Great read 2 mai 2009
Par V Drucker - Publié sur Amazon.com
Format: Relié
Kumar's book on the history of early twentieth century physics and atomic theory skips from page to page, fleshing out scientific expanations with vivid descriptions of the key protagonists. It is a real skill to make sophisticated scientific theories accessible to the lay person, but Kumar's use of metaphor helps bring the most intangible concepts to life. This is a modern classic, but more important, a really fun read.
29 internautes sur 31 ont trouvé ce commentaire utile 
If a tree falls and a physicist wasn't there - it never happened. 3 juillet 2010
Par David Wineberg - Publié sur Amazon.com
Format: Relié
There are a number of very striking themes and trends in Quantum that other reviewers have not brought out, being dazzled, no doubt, by the swift pacing, tantalizing prose and cliffhanger hooks that Kumar employs so magnificently in Quantum.

First, as someone who has struggled to understand quantum mechanics when it is presented in textbooks as a whole system, I was delighted to find that physicists have the same problem. Even (if not especially) Albert Einstein. By taking us through the history of it, and enjoying the exhilaration of every incremental discovery, theory and step, I find I am really comfortable reading about it, and have no difficulty assimilating it. When you're along for the ride instead of the textbook, it makes a gigantic difference. Bravo, Kumar.

Second, it became painfully obvious that physics is far more philosophy than science. I felt like the arguments came from my Logic 101 class. Socrates would have enjoyed crossing swords with Bohr. The arguments of the scientists were really basic, philosophical differences of opinion, not the least bit esoteric or idiosyncratic. It seems that medicine is not the only "science" where they tell you to get a second opinion. That was a revelation, and it made physics all that more human.

Third, Quantum confirms a lifelong suspicion that this was and is a young man's game. It seems that every time things started to get stale, some precocious 26 year old student would come along with a new portion of a theory, and rock the establishment. And then live off that discovery for the rest of his life - winning the Nobel Prize (as almost every one of them eventually did), getting professorships - but never shaking the tree again. In music we would call them one hit wonders. Einstein was about the only one with two hits - brainstorms in 1905 and 1916 - but then, even he couldn't fathom the totality of quantum physics and never made another major contribution to its progress. By the age of 50 he was calling himself an "old fool".

So in addition to all the praise heaped on Quantum for its superior exposition, I think it's a wonderful addition to the discussion of the human condition. Valuable on a number of levels.

What a great book.
11 internautes sur 12 ont trouvé ce commentaire utile 
An Enlightening Book on Einstein and the Quantum Theory Debate 3 novembre 2011
Par Jay Lehr - Publié sur Amazon.com
Format: Relié
While I was a student at Princeton University in the early 1950s, I had a literally nodding acquaintance with Albert Einstein. During my freshman year he walked past my dormitory every day on his way to the Institute for Advanced Study. I often found myself on the sidewalk as he passed by, and we nodded to each other. I have read many an interesting biography of his life since, but none more interesting than Quantum, by Manjit Kumar.

Quantum is a story not just of Albert Einstein's life but also his thought processes. It also provides insight into the dozens of famous theoretical physicists who influenced and aided him in his work.

Complex Science Explained
Quantum theory, which attempts to describe the atomic and subatomic worlds, is for most people a byword for mysterious, impenetrable science. For many years it was equally baffling for the world's most brilliant physicists. Here the author gives us a dramatic and superbly written account of this fundamental scientific revolution and the divisive debate at its core.

Simply reading Quantum may not make one an immediate expert on quantum theory, but the chronology of every great contribution to the physics of quantum theory--beginning in 1858 and continuing to the present--will be worth the price of the book.

The most complex and difficult-to-understand intricacies of quantum theory in no way reduced the joy I felt in reading this book and following the journey of so many great scientists as they researched and published their discoveries. Interestingly, these discoveries were not often verified in a laboratory, but they were agreed upon because they accorded with physical observations and allowed for reasonable mathematical solutions.

Interesting Narratives, Theories
In one of the most compelling discussions in the book, Kumar describes a conference held in Belgium in 1927. Of the 29 people invited to the conference, 17 went on to receive the Nobel Prize. At times Kumar made me feel like I was in the room. Heisenberg, Planck, Born, and Schrödinger came alive for me as I read these passages.

In an enlightening scientific discourse, Kumar explains the concept of entanglement, a quantum phenomenon in which two or more particles remain inexorably linked no matter how far apart they are. He also explains the intriguing quantum theory in which Dr. Schrodinger's cat can be simultaneously dead and alive.

Quantum is not a book for everyone. But if you have a great deal of scientific curiosity and enjoy reading about some of the greatest scientific minds in history, you will certainly enjoy this book.

Jay Lehr, Ph.D. (lehr@heartland.org) is science director of The Heartland Institute.
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