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About Time: Einstein's Unfinished Revolution (Penguin Science) Kindle Edition

4.4 von 5 Sternen 17 Kundenrezensionen

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Länge: 311 Seiten Word Wise: Aktiviert Sprache: Englisch

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Produktbeschreibungen

Pressestimmen

Los Angeles Times Elegantly written and comprehensible, full of wonder and lucid explanation.

Frederic Golden San Francisco Chronicle A stimulating -- indeed, timely -- read.

Michio Kaku author of Hyperspace: A Scientific Odyssey Through Parallel Universes, Time Warps, and the 10th Dimension It's about time someone wrote the definitive history of time...I can think of no one better than Paul Davies...Einstein himself would have been pleased.

Will St. John Detroit Free Press The fun here is in the journey and Davies is an entertaining guide.

Kurzbeschreibung

This is a book about the meaning of time, what it is, when it has started, how it flows and where to. It examines the consequences of Einstein's theory of relativity and offers startling suggestions about what recent research may reveal.

Produktinformation

  • Format: Kindle Edition
  • Dateigröße: 1727 KB
  • Seitenzahl der Print-Ausgabe: 311 Seiten
  • Verlag: Penguin; Auflage: New Ed (28. September 2006)
  • Verkauf durch: Amazon Media EU S.à r.l.
  • Sprache: Englisch
  • ASIN: B00333NCPQ
  • Text-to-Speech (Vorlesemodus): Aktiviert
  • X-Ray:
  • Word Wise: Aktiviert
  • Verbesserter Schriftsatz: Nicht aktiviert
  • Durchschnittliche Kundenbewertung: 4.4 von 5 Sternen 17 Kundenrezensionen
  • Amazon Bestseller-Rang: #337.646 Bezahlt in Kindle-Shop (Siehe Top 100 Bezahlt in Kindle-Shop)

  •  Ist der Verkauf dieses Produkts für Sie nicht akzeptabel?

Kundenrezensionen

Top-Kundenrezensionen

Format: Taschenbuch
An entertaining, but ultimately empty book.
At times I felt like I was reading a well written adaptation of an "In Search Of..." episode (that 1970s TV show hosted by Leonard Nemoy) in the way that Paul Davies suggestively introduces popular Sci-Fi myths as credible and provides dramatic arguments from the view of the myth-makers. Don't get me wrong, as a kid I loved watching "In Search Of", but it and the quasi-science reporting shows like it aren't science and rarely (if ever) provide insight into the way the world works.
One example of what I'm referring to: Davies reports a theory proposed by Astrophysicist Brandon Carter which predicts the annihilation of human life within 8000 years (pg 258 - 264). The stated basis of the theory is essentially the "anthropic principal" and the statistical improbability that you or I should be alive "now" if humanity continues to thrive "for thousands or even millions of years" into the future. Nearly all the people who ever live will live a long time in our future, the argument goes, and given the number of human beings yet to be born, statistically, you and I would be much more likely to be born thousands of years from now... unless our "escalating population is soon to be chopped back, perhaps by a sudden catastrophe".
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Format: Taschenbuch
If you've ever wondered what is time, where did it come from, does it flow, why does it seem to go in one direction, will it have an end, or is it slowing down, you'll not find your answers in Paul Davies' book "About Time." Neither are you likely to find your answers anywhere else. For me, the most profound knowledge that came from reading Davies' book is the reminder that we really don't know what time is. We live in it, experience it, but really - on a fundamental level - fail to comprehend it.
Davies has subtitled his book "Einstein's unfinished revolution," and he does an excellent job of exposing the reader to some of the unexpected (from a common-sense point of view) conclusions we draw about time from the special and general theories of relativity. He offers an interesting historical perspective on the life of Einstein, and how he developed his theories. Davies also provides some interesting background on experiments that have validated Einstein's space-time, reviewing the qualitative results from some of the more important experiments.
After this introduction to the non-universal time of relativity, Davies takes us to the ultimate time machine: black holes. He offers some interesting explanations about what an imaginary traveler to a black hole might see looking out, and how we - looking in - might view the hapless victim as she neared the event horizon.
As the book progresses, conclusions and examples become less and less concrete. Relative time is a proven fact, and most physicists consider black holes a foregone conclusion. From there, Davies takes us to the very root of some of the biggest issues in cosmology: the origin of time and the age of the universe.
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Format: Taschenbuch
"About Time" is a wonderful popularization of the of the problem of time as it is found in physics. Davis takes us step by step from a brief overview of how traditional philosphers dealt with time to the modern understanding of time that emerged as a consequence of Einstein's relativity.
It turns out that modern physics has so far not been able to give definitive answers to the most interesting questions about time: Is it in some sense independent of the observer, or is it all in the head? Why does the arrow of time always point toward the future? Is time travel humanly possible? We learn along the way, however, that contemporary physics has begun to close in on these questions, and the insights come not only from relativity, but also from thermodynamics, statistical mechanics, and quantum mechanics. Einstein's revolution is still unfinished, partly because the mainstream of physics since Einstein has been preoccupied with areas other than general relativity. But now this detour from relativity may prove very productive, as findings from these other areas have the potential to contribute significantly to our understanding ot time. The theoretical possibilities described by Davis are astounding. I read the section about antiworlds four or five times, for I could not believe my eyes--it was that fascinating. We live in a universe that is still largely undiscovred, and there may be an infinity of universes in existence: some similar to ours, others as different as one can imagine. Astrophysics today is a field pregnant with earth shuttering discoveries. And Davies' book is a superb introduction to the field and the concept "time" in particular.
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