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TIME MACHINES. : Time travels in Physics, Metaphysics, and Science Fiction, 2nd edition (Anglais) Relié – 20 avril 2001


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Descriptions du produit

Book by Nahin Paul J



Détails sur le produit

  • Relié: 628 pages
  • Editeur : Springer-Verlag New York Inc.; Édition : 2nd ed. 1999. Corr. 2nd printing 2001 (20 avril 2001)
  • Langue : Anglais
  • ISBN-10: 0387985719
  • ISBN-13: 978-0387985718
  • Dimensions du produit: 15,6 x 4 x 23,4 cm
  • Moyenne des commentaires client : 5.0 étoiles sur 5  Voir tous les commentaires (1 commentaire client)
  • Classement des meilleures ventes d'Amazon: 808.546 en Livres (Voir les 100 premiers en Livres)
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Première phrase
To travel in time. Lire la première page
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Couverture | Copyright | Table des matières | Extrait | Index | Quatrième de couverture
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1 internautes sur 1 ont trouvé ce commentaire utile  Par JFL le 22 avril 2013
Format: Relié Achat vérifié
350 pages de texte, 200 pages de notes, 50 pages de bibliographie : une somme ! Je
n'ai pas encore lu le livre mais la table des matières est alléchante.
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Amazon.com: 13 commentaires
21 internautes sur 22 ont trouvé ce commentaire utile 
Paul Nahin has written an excellent book for the layperson. 12 mai 1997
Par Un client - Publié sur Amazon.com
Format: Broché
People have long been fascinated with the idea of time travel. The possibilities are exciting -- you could go back in time and experience firsthand all the wonders of history. You could actually get a second chance to correct mistakes in your own life. To some these possibilities are frightening -- if you really can change the past, what does this do to our sense of continuity? To history? What if you went back and killed your own father before he even met your mother?

Paul J. Nahin discusses both sides of this issue in his thought provoking book Time Machines: Time Travel in Physics, Metaphysics, and Science Fiction. He begins with an overview of time travel, from scientific possibility of it, to popular conjecture about it. He goes on to discuss the nature of time itself, and then ends with an in-depth analysis of paradoxes created by the possibility of time travel. He assures us that we do not have to worry about changing history, because the past cannot be changed.

Nahin has written an excellent book for the layperson. He includes many references to popular works of science fiction, including many stories and movies the reader is probably familiar with. This helps illustrate many of his points. The text is clear and well written. Anyone without a background in physics can understand this book. For those with a more technical bent Nahin includes a few "Tech Notes" at the end of the book to explain certain phenomena he discusses. Time Machines is an exciting book for anyone who has ever sat outside on a long summer night and wondered "what if."
11 internautes sur 12 ont trouvé ce commentaire utile 
time for a trip to the passsed 20 septembre 2001
Par Mindy - Publié sur Amazon.com
Format: Relié
I am no scientist, that's for certain.
This book is a wonderful blend of science and science fiction. It is perfect for people like me, who are fascinated by the idea of time travel but can't understand math or physics for anything. The first few chapters are basically a literature review. An extremely comprehensive literature review. It'll be enough to make you run to your library or bookstore (or computer) in search of these books and short stories.
Nahin also discusses the reality behind time travel with relatively little math. Most of the math is tucked away in the "Tech Notes in the back of the book. Nice technique to sucker in the math-scaredys like me.
What I really loved about the book, though is Nahin's enthusiasm. He is obviously just as nuts (or more) as I am about this outlandish subject of time travel, which makes the book, in my opinion, stand-out.
8 internautes sur 9 ont trouvé ce commentaire utile 
Man Must Conquer Time! 9 mars 2001
Par New Age of Barbarism - Publié sur Amazon.com
Format: Broché
This book is a good introduction to some of the science fiction and science fact speculations concerning the possibility of time travel. It considers time travel from early science fiction speculations (e.g. H. G. Wells' _Time Machine_) to modern science speculations involving quantum mechanics, faster-than-light tachyons, and wormholes. From the classic speculations involving General Relativity of Kurt Godel and his rotating universe, to the modern speculations of Kip Thorne involving the use of wormholes to travel backwards in time, the science of time travel is made clear to the lay person. Philosophical speculation with regards to the metaphysics of time is dealt with fully. The apparent paradoxes of time travel (backwards in time) (e.g. the "grandfather paradox") are considered and possible resolutions to them are proposed. In the end, the reader is left to decide for himself whether time travel is: 1. possible, and 2. feasible (at whatever level of technological advancement). According to Stephen Hawking, the fact that we haven't been visited by time travelling tourists is evidence against the possibility of backwards in time, time travel. I myself do not believe this to be the case and think that there is some other reason for the apparent absence of time travellers. For those of us who boldly wonder about the possibilities of man's future evolution, future technological progress, and future civilization, the issue of time travel is an unavoidable and a tempting one. If man is to ever conquer the galaxy, he must conquer time first. It must be possible - it will be possible! This book is an appeal to dreamers and speculative philosophers to examine fully the issues, paradoxes, and proposed methods of time travel.
5 internautes sur 5 ont trouvé ce commentaire utile 
This book is awesome!!!! 8 octobre 2000
Par "kalirob99" - Publié sur Amazon.com
Format: Relié
This book just proves that there are things out there that we dont know, and that we should be figuring it out. Before reading this book I thought time travel was virtually impossible, but after reading it I knew that there is a way to do this we just need to try and figure out the mysteries. All in all this books is by FAR the greatest book on time travel yet.
4 internautes sur 4 ont trouvé ce commentaire utile 
The past can be affected but not changed 11 juin 2007
Par Steve Reina - Publié sur Amazon.com
Format: Relié
The past can be affected but not changed.

This seems to be the moral of this little book from science fiction write Paul Nahin. And, unlike many others who've attempted to talk about time in a serious way, Nahin is all too ready to show readers that he's done his homework.

In four (blink and you'll miss it) sections Nahin takes readers on a whirlwind tour of the issues involved in time travel:

1) An overview of time travel. In this section Nahin samples time travel stories of the ages. While doing so, he introduces readers to some of the more pertinent time travel issues serious thinkers have raised about the topic. One such example is if time travel is real, where are all the travelers? While admitting the serious nature of the question and its implications Nahin also provides readers with possible responses to it (for example, the time machines don't reach back to our era). Another example of serious issues raised is a treatment by Princeton mathematician Kurt Godel who -- using Einstein's own equations -- came up with a solution for them which actually allows time travel. (The good news for time travel fans is that Einstein approved of the solution. The bad news is that it requires our universe to possess physical charactistics it lacks.)

2) On the nature of time, spacetime and the fouth dimension. In this section Nahin discusses hoary questions like what is time? Is time real? And what does it physically consist of? This section is a perfect case in point to the cursory nature with which Nahin treats some of these issues. As to the matters raised in this chapter alone I would refer readers to Michio Kaku's very excellent Hyperspace PRIOR to reading this section. So educated readers will better be able to understand the throwaway references made by Nahin as he sails through topics that probably could each consist of a book in themselves. Of course, just like in the previous section Nahin cites readers to time travel stories which have teased out themes he raises in this section.

3) The arrow of time. Here Nahin digs deep into the question of why time has seeming particular directional arrow. Just as with the previous section I made reading suggestions so that people coming to this book may better be able to appreciate I will make two suggestions now: The Physical Basis of the Direction of Time by Deiter Zeh (in which Zeh discusses the various possible arrows of time as they exist in nature) and also About Time by the University of Adelaide's Paul Davies (in which Davies goes over the same territory, albeit perhaps at more introductory level than that pursued by Zeh). As he does throughout this book Nahin tantalizingly scatters references to various time travel stories as they relate to these issues.

4) Time Travel Paradoxes and Their Explanations. Its perhaps here where Nahin best displays his various beliefs about how time travel would really work. Heavily influenced by Einstein, Godel and science fiction writer HG Wells, Nahin reiterates his views: Time is probably an illusion. Instead all that ever has or seemingly will happen exists now. Attempts to alter past history are mere fantsies therefore though Nahin does allow that some events may involve backwards causation where future actors purposefully or unwittingly aided in bringing them about. Consistent with his thorough treatment of time travel issues however Nahin is candid about how multi universes could make changing the past possible.

Make no mistake. This is a tough book made additionally hard by its brief treatment of some of the issues involved. But I think prepared readers will be glad they made the effort.
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