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Three Roads To Quantum Gravity (Science Masters) [Kindle Edition]

Lee Smolin
5.0 von 5 Sternen  Alle Rezensionen anzeigen (4 Kundenrezensionen)

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Taschenbuch EUR 12,94  


Produktbeschreibungen

Amazon.de

It's difficult, writes Lee Smolin in this lucid overview of modern physics, to talk meaningfully about the big questions of space and time, given the limitations of our technology and perceptions.

It's more difficult still given some of the contradictions and inconsistencies that obtain between quantum theory, which "was invented to explain why atoms are stable and do not instantly fall apart" but has little to say about space and time, and general relatively theory, which has everything to say about the big picture but tends to collapse when describing the behavior of atoms and their even smaller constituents. Whence the hero of Smolin's tale, the as-yet-incomplete quantum theory of gravity, which seeks to unify relativity and quantum theory--and, in the bargain, to move toward a "grand theory of everything." Smolin ably explains concepts that underlie quantum gravity, such as background independence, the superposition principle, and the notion of causal structure, and he traces the development of allied theories that have shaped modern physics and led to this new view of the universe.

Although he allows that "it has not been possible to test any of our new theories of quantum gravity experimentally," Smolin predicts that a solid framework will be established by 2015 at the outside. If he's correct, the years in between promise to be an exciting time for students of the physical sciences, and Smolin's book makes an engaging introduction to some of the big questions they'll be asking. --Gregory McNamee

Amazon.com

It's difficult, writes Lee Smolin in this lucid overview of modern physics, to talk meaningfully about the big questions of space and time, given the limitations of our technology and perceptions.

It's more difficult still given some of the contradictions and inconsistencies that obtain between quantum theory, which "was invented to explain why atoms are stable and do not instantly fall apart" but has little to say about space and time, and general relatively theory, which has everything to say about the big picture but tends to collapse when describing the behavior of atoms and their even smaller constituents. Whence the hero of Smolin's tale, the as-yet-incomplete quantum theory of gravity, which seeks to unify relativity and quantum theory--and, in the bargain, to move toward a "grand theory of everything." Smolin ably explains concepts that underlie quantum gravity, such as background independence, the superposition principle, and the notion of causal structure, and he traces the development of allied theories that have shaped modern physics and led to this new view of the universe.

Although he allows that "it has not been possible to test any of our new theories of quantum gravity experimentally," Smolin predicts that a solid framework will be established by 2015 at the outside. If he's correct, the years in between promise to be an exciting time for students of the physical sciences, and Smolin's book makes an engaging introduction to some of the big questions they'll be asking. --Gregory McNamee


Produktinformation

  • Format: Kindle Edition
  • Dateigröße: 1035 KB
  • Seitenzahl der Print-Ausgabe: 260 Seiten
  • ISBN-Quelle für Seitenzahl: 0465078362
  • Verlag: Basic Books; Auflage: Reprint (18. März 2008)
  • Verkauf durch: Amazon Media EU S.à r.l.
  • Sprache: Englisch
  • ASIN: B003PJ6UFC
  • Text-to-Speech (Vorlesemodus): Aktiviert
  • X-Ray:
  • Durchschnittliche Kundenbewertung: 5.0 von 5 Sternen  Alle Rezensionen anzeigen (4 Kundenrezensionen)
  • Amazon Bestseller-Rang: #193.999 Bezahlt in Kindle-Shop (Siehe Top 100 Bezahlt in Kindle-Shop)

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1 von 1 Kunden fanden die folgende Rezension hilfreich
5.0 von 5 Sternen Fundamentale Gedanken zu Raum und Zeit 7. September 2013
Format:Kindle Edition|Verifizierter Kauf
Vorweg: Dieses Buch ist meines Erachtens nur für Naturwissenschaftler verdaulich. Der Autor hat sich zwar unglaublich Mühe gegeben, seine tiefschürfenden Gedankengänge leichtfasslich und ohne Mathematik wiederzugeben, aber ohne gute bis sehr gute Grundkenntnisse in Physik und Kosmologie wird man vermutlich nur Bahnhof verstehen.

Für mich war dieses Buch nach Brian Greenes "Das elegante Universum" ein weiteres Highlight - allerdings aus verschiedenen Gründen. Greene gelingt es beispielsweise atemberaubend gut, Grundlagen der Relativitätstheorie zu vermitteln. An der Uni hätte ich mir so einen Lehrer gewünscht. Lee Smolin spielt hingegen seine Stärken darin aus, aus allerfundamentalsten Prinzipien heraus ganz neue Einsichten zu Raum und Zeit zu entwickeln. Zwar haben sich seine optimistischen Prognosen im Hinblick auf die Schaffung einer allgemein akzeptierten Theorie der Quantengravitation noch nicht erfüllt, aber sein Enthusiasmus reißt den Leser mit.

Zudem habe ich viele spannende und überraschende Dinge gelernt, die gar teilweise gar nicht so neu sind, aber während meines Studiums in den achtziger Jahren von meinen etwas verschnarchten Professoren nicht vermittelt wurden. So beispielsweise die Resultate von William Unruh zum Äquivalenzprinzip, das eine der Grundlagen der allgemeinen Relativitätstheorie ist. Besonders fasziniert hat mich, wie viele Resultate der Kosmologie, insbesondere die Bekenstein-Grenze, zum Verständnis von Quanteneffekten herangezogen werden können.
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Format:Kindle Edition
Dieses Buch handelt von Quantengravitation, die sowohl Loop Quanten Gravitation als auch die Stringtheorie umfasst. Der Autor behandelt beide Themen gleichermassen. Doch meist geht es gar nicht so sehr um die Feinheiten der Theorien, sondern hauptsaechlich um dieFrage was Raum und Zeit sind. Diese Frage wird aber immer aus physikalischer, nie aus philosophischer betrachtet. das Kapitel ueber Loop Quanten G. ist allerdings nicht ganz sooo gut, denn hier schweift der Autor zu sehr zur Entstehungsgeschichte ab. Doch im ganzen Buch erfaehrt man schliesslich doch sehr viel auch ueber die L Q G. Alles in allem sehr gelungen!
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2 von 16 Kunden fanden die folgende Rezension hilfreich
5.0 von 5 Sternen An der Grenze des Fruchtlandes 26. Januar 2008
Format:Taschenbuch|Verifizierter Kauf
Seit dem Buch 'The Emperors new mind' ist dies das beste Buch über die aktuellen Entwicklungen der theoretischen Physik, daß ich gelesen habe. Und trotzdem bleibt ein Gefühl des Unbehagens. Nichts was mit dem Stil oder den Fähigkeiten des Autor zu tun hat, sondern mit der Entrücktheit der Materie, die so weit weg von aller möglichen Erfahrung sich bewegt. Es scheint, daß jeder neuer Erfolg der Theorie zu neuen Problemen führt. Es ist deshalb keineswegs sicher, daß es in der Zukunft eine einheitliche Theorie der 'Welt' geben wird. Und selbst wenn es sie gäbe, sie würde nichts davon wissen, daß es in dieser Welt teilnehmende, erlebende und leidende Wesen gibt, dies gilt aber von jeder reduktionistischen Theoriebildung.
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3 von 25 Kunden fanden die folgende Rezension hilfreich
5.0 von 5 Sternen Gutes Buch 24. August 2005
Von Ein Kunde
Format:Taschenbuch
Es gibt nur wenige Bücher die die schwierige Materie der Quantengravitation Behnadeln denn die Quantengravition ist meines erachtents nur ein Thema für eingefleischte Physikfans. Jedoch finde ich das dieses Buch das Thema gut rüberbringt und es dem Leser gut schildert.
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Amazon.com: 4.1 von 5 Sternen  62 Rezensionen
126 von 131 Kunden fanden die folgende Rezension hilfreich
4.0 von 5 Sternen Readers get at least a vague picture of a difficult problem 27. Juli 2001
Von Tatsuo Tabata - Veröffentlicht auf Amazon.com
Format:Gebundene Ausgabe
The completion of a quantum theory of gravity (quantum gravity for short) is one of the most challenging problems in science in the twenty-first century. This theory aims at unifying Einstein's theory of general relativity for large-scale phenomena with the quantum theory for the micro-world, to get understanding of everything from space and time to matter and the universe. Lee Smolin, Professor of Physics at Pennsylvania State University, tells the story of recent and future research pursuing this theory for the intelligent layperson.
The author writes earlier chapters very understandably. The reader who knew nothing about the quantum gravity learns easily the following interesting things: There are three approaches to quantum gravity, i.e., the route from quantum theory (string theory), the road from the theory of general relativity (loop quantum gravity), and the path from fundamental principles. To do cosmology the classical logic demanding that every statement be either true or false is inadequate. A theory of quantum gravity has to answer about the nature of the information tapped in a quantum black hole. The search for the meaning of the temperature and entropy of a black hole is now leading to the discovery of the atomic structure of space and time. Etc.
In the middle of the book the author states that the style of these chapters will be more narrative than others because he can describe from personal experience some of the episodes in the development of loop quantum gravity. Lessons told are, for example, as follows: Science progresses quickly when people with different backgrounds and educations join forces. Einstein's example teach us that trying to invent new laws of physics requires not only intelligence and hard work but also insight, stubbornness, patience and character. Of course, these are also quite understandable.
In the last three chapters some or most of readers might find it difficult to follow the author's explanation. After reading the whole book, however, all the readers would feel that they have gotten at least a vague picture about the difficult problem of proceeding to quantum gravity. This is an exciting book for those who want to catch a glimpse of theoretical physics at its forefront.
There are some typos. Among them the followings are especially unfortunate, because the meanings of one of the laws of thermodynamics and the Heisenberg uncertainty principle are completely reversed to lead laypersons astray: In chapter 7, "The second law of thermodynamics requires only that the total entropy of the world never increase" should read "The second law . . . never decreases." In two inequalities in chapter 11, the symbol of "less than" should be that of "greater than or equal to."
60 von 62 Kunden fanden die folgende Rezension hilfreich
3.0 von 5 Sternen Nice book on Quantum Gravity 19. Juli 2001
Von K. Graham - Veröffentlicht auf Amazon.com
Format:Gebundene Ausgabe|Verifizierter Kauf
I approached this book with great enthusiasm, hoping for a pedestrian treatment of loop quantum gravity (LQG). To be fair, most of this book is pretty good. Smolin writes pretty well, especially about relational quantum mechanics and how it relates to quantum gravity and cosmology. In addition, Smolin clearly points out why many relativists have issue with string/m-theory's lack of background independence.

I was, however, mildly disappointed in his discussion of the physical meaning of spin networks and loops and in his exposition of a possible synthesis of M-theory and LQG. Perhaps I overlooked it, but this book doesn't directly point out how you go from spin networks and spin foams to spacetime. But, you can figure it out... if you know enough general relativity and quantum field theory.

The appendix of this book is excellent! It provides many useful references to the literature.

All things considered though, this book is worth a read, especially to learn about the connection between spacetime, gravity, and quantum mechanics.

I originally rated this three stars. I recently reread the book and now want to give it four stars.
30 von 30 Kunden fanden die folgende Rezension hilfreich
4.0 von 5 Sternen Very good, but no audience is ideally served 5. Juni 2006
Von Irfan A. Alvi - Veröffentlicht auf Amazon.com
Format:Taschenbuch
As my title states, this book is very good, but with the significant caveat that no particular audience is ideally served by it.

If you are truly a layman, you may initially be pleased to find that the book has essentially no formal mathematics and the technical vocabulary isn't too extensive. Smolin himself says that the book is aimed at the "intelligent layman" and that "the reader who has not read anything previously on these subjects will be able to follow this book." However, the book tries to convey a meaningful understanding of some rather advanced (some would say speculative) physics in the areas of thermodynamics of black holes, loop quantum gravity, and string theory, and it does this in a manner which is philosophically sophisticated, with many fundamental questions being raised about the nature of space, time, and scientific theories in general. Moreover, despite Smolin's claim to the contrary, one can't adequately appreciate what the book is about without a basic (at least popular-level) background in quantum mechanics and relativity, which the book doesn't provide.

As a result, I anticipate that the true layman would find this book to be difficult going. Instead, a more realistic audience would be the "advanced layman" who has some prior familiarity with this subject matter, particularly the basics of quantum theory, relativity, the standard model, and cosmology. This audience (which includes me) would probably find the book to be quite stimulating and interesting, and would get a sense of what this advanced physics is all about. However, because the presentation lacks the mathematics and technical details needed for anything resembling a rigorous understanding, they will probably also be left wishing the book had 50 more pages of "meat" and some key equations (explained carefully, but without derivations). For the same reason, the advanced reader would probably also wish the book was at least one notch more advanced, but even these readers may still find the book to be a fun and interesting overview of the subject.

Finally, I'd like to suggest that potential readers should be wary of reviewers who strongly favor the book because they agree with it's thesis, or condemn the book because they disagree. We are dealing with subject matter about which there is no consensus even among eminent physicists, so these reviews are not the place for readers to throw in their two cents about which theories are right and wrong. Instead, this sort of book should be judged mainly on criteria such as whether good questions are asked, whether the context for these questions is well formed, whether the alternative answers proposed for these questions are explained clearly and fairly, and whether the text is well-written. On all of these counts, my judgement is that Smolin does a good job.
13 von 13 Kunden fanden die folgende Rezension hilfreich
4.0 von 5 Sternen An Introduction to Loop Quantum Gravity 4. Mai 2004
Von Rama Rao - Veröffentlicht auf Amazon.com
Format:Taschenbuch
Since the postulation of theory of relativity (theory of cosmos, which describes the structure of space and time), and quantum mechanics (laws of microcosm, which describes atomic structure, nuclear forces, and nature of basic component of matter); physicists until now have struggled to explain gravity (which is a manifestation of spacetime fabric in presence of matter) in terms of quantum mechanics (quantum gravity). In this book the author attempts to explain three different approaches to quantum gravity; Loop Quantum Gravity (LQG), Superstring - M theory (S. -M), and Blackhole Thermodynamics (BT). While each takes a different starting point, they all agree when viewed on Planck scale, and they also view space and time are not continuous, and space is composed of discrete units. LQG gives us a detailed picture of these units in terms of spin networks, where as S.-M theory proposes continuous space in terms of a continuous string (with compactified extra dimensions) made of string bits, which is governed by uncertainty principle. BT theory states that amount information in any given space is finite and is proportional to the area of the boundary of the region in Planck units. The author is a pioneer in the field of LQG and provides the reader with a good introduction of the theory in a non-mathematical form and then compares with S.-M and BT theories. The book is described in three parts; the first part is a general introduction, which describes historical development of three theories, the second part introduces LQG and then compares with S.-M and BT theories, and the final part attempts to unify the three approaches into a single theory using Holographic Principle.
The author gives us several interesting accounts of physicists working in these fields are in a climate of mutual ignorance and complacency with the belief that their theory is correct and others are wrong. There are instances when one group can't solve certain problems, and they seek the help from the other camp. The author also briefly explains other theories such as Twister theory, and Non-Commutative Geometry. This is one of the few books I have read which describes LQG in some detail, although there are several books in literature, which describes S.-M theory. The author is very honest in comparing the three approaches to offer the best explanation for quantum gravity. Anyone who wants to understand LQG must have this book.
38 von 45 Kunden fanden die folgende Rezension hilfreich
5.0 von 5 Sternen Light Reading On A Heavy Subject 29. Juni 2001
Von Bruce Crocker - Veröffentlicht auf Amazon.com
Format:Gebundene Ausgabe
Three Roads To Quantum Gravity by Lee Smolin isn't the easiest highway to travel in the universe, but will be rewarding to anyone taking the journey. Smolin, currently a professor at Penn State [my alma mater :)], writes simply, but smartly about the biggest piece of unfinished physics business leftover from the 20th Century, the resolution of the conflicts between our theory of the large, general relativity, and our theory of the small, quantum mechanics. Smolin assumes an interested and educated reader and simplifies our trip by not doing long introductions to relativity and quantum mechanics. After introducing the idea of a theory of quantum gravity, Smolin spends the rest of the book laying out the 'three roads' of the title, spending slightly more time on loop quantum gravity, the 'road' he's spent the most time on. Although not as elegantly written or as detailed as Brian Greene's The Elegant Universe, Three Roads To Quantum Gravity compliments that earlier book by coming at 'theory of everything' territory from a different direction. Since there is no AAA for physics, layfolks like myself should be glad that we have guides like Lee Smolin to direct us through the hidden regions of our universe.
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