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A First Course in Loop Quantum Gravity [Anglais] [Relié]

Rodolfo Gambini , Jorge Pullin
4.0 étoiles sur 5  Voir tous les commentaires (1 commentaire client)
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Descriptions du produit

Revue de presse

I highly recommend this book ... Congratulations to the authors for the great, concise, effective presentation of this challenging field to students and interested researchers coming from other fields. (Christine Córdula Dantas, Toy Universes)

Gambini and Pullin have written an excellent and truly introductory book, aimed at the undergraduate level, which fills a gap in the existing literature, and responds to the growing interest in this subject. (Carlo Rovelli, Aix-Marseille University, France)

Loop quantum gravity is currently one of the main approaches in the search for a quantum theory of gravity. Written by well-known experts in this field, "A First Course in Loop Quantum gravity" is the first book on this topic that is accessible already to undergraduates. No previous knowledge of general relativity and quantum field theory is required; instead, the necessary material from these subjects is introduced in a clear and pedagogical way. The authors present the key features of loop quantum gravity, but also do not hide its weak points. The book can be recommended to anyone from student to established scientist who wants to get a short, reliable, and clear introduction to this fascinating field of research. (Claus Kiefer, University of Cologne, Germany)

Marvellously succeeds in starting from the basics of special relativity and covering basic topics in Hamiltonian dynamics, Yang Mills theory, general relativity and quantum field theory, ending with a tour on current (loop) quantum gravity research. This is done in a short 192 pages! (Bianca Dittrich, IOP Publishing)

Présentation de l'éditeur

This book provides an accessible introduction to loop quantum gravity and some of its applications, at a level suitable for undergraduate students and others with only a minimal knowledge of college level physics. In particular it is not assumed that the reader is familiar with general relativity and only minimally familiar with quantum mechanics and Hamiltonian mechanics. Most chapters end with problems that elaborate on the text, and aid learning. Applications such as loop quantum cosmology, black hole entropy and spin foams are briefly covered. The text is ideally suited for an undergraduate course in the senior year of a physics major. It can also be used to introduce undergraduates to general relativity and quantum field theory as part of a 'special topics' type of course.

Détails sur le produit

  • Relié: 192 pages
  • Editeur : OUP Oxford (22 septembre 2011)
  • Langue : Anglais
  • ISBN-10: 0199590753
  • ISBN-13: 978-0199590759
  • Dimensions du produit: 1,5 x 17,8 x 25,4 cm
  • Moyenne des commentaires client : 4.0 étoiles sur 5  Voir tous les commentaires (1 commentaire client)
  • Classement des meilleures ventes d'Amazon: 47.707 en Livres anglais et étrangers (Voir les 100 premiers en Livres anglais et étrangers)
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Par Bob92
Format:Relié|Achat vérifié
Il s'agit d'une introduction à la gravitation quantique à boucles. Les fondateurs de cette théorie ne prétendent pas que celle-ci soit la théorie ultime comme certains partisans de la théorie des cordes sur cette dernière. La théorie des cordes unifie effectivement les particules de matières et les médiateurs des forces fondamentales, mais en aucun cas la mécanique quantique et la relativité générale. En effet, les calculs actuels sont réalisés dans un espace temps à géométrie fixée par avance alors que la relativité générale est une théorie dynamique de la matière et de la géométrie de l'espace temps. En revanche la gravitation quantique à boucles unifie dans un même cadre théorique la mécanique quantique et la relativité générale.
Il s'agit donc d'une belle alternative à la théorie des cordes mais ne constitue pas non plus une théorie ultime. En effet, elle ne permet pas de donner un sens à la mécanique quantique qui n'est qu'une description du monde infinitésimal (et certainement pas explicative) et ne donne pas la nature exacte du temps. Cependant, elle amène à réfléchir et peut-être qu'une percée dans ce domaine sera liée à la combinaison des différentes approches actuelles (il y en a plusieurs tout de même). A méditer...
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Amazon.com: 4.0 étoiles sur 5  8 commentaires
18 internautes sur 20 ont trouvé ce commentaire utile 
5.0 étoiles sur 5 Finally, a real introduction to the field. 28 décembre 2011
Par Christine C. Dantas - Publié sur Amazon.com
Format:Relié
If you are looking for an introduction to Loop Quantum Gravity that *really* guides you through every *minimum* required piece of knowledge at the basis of this field, including an outline of the mathematics involved, in order to put you in a comfortable position to enter the research literature, then there is (currently) no better place to start.

It has always been a mystery to me why Rovelli's book, for instance, is generally considered as "introductory". Although it is a very well written book by one of the experts in the field, and obligatory reading for those seriously interested in studying the matter, readers who had never - or only slightly - been exposed to Loop Quantum Gravity will find it quite advanced at various places. The same occurs with other similar books in this field, considered "introductory": they may be so at places, but... only to the extent of your background, which seems an amusing way to put it, if not frustrating: "introductory-but-not-exactly-so".

That does not happen with Gambini and Pullin's book. It is indeed the only current *real* introductory, (not laymen, but mathematically-based!), self-study textbook on Loop Quantum Gravity. All other current books in the field - Rovelli's, Kiefer's, Thiemann's, etc - are excellent references to be studied *after* Gambini and Pullin's book. Finally, the basics of Loop Quantum Gravity is available in textbook form!

"A First Course in Loop Quantum Gravity" is in fact aimed at the advanced undergraduate level, and it does a great job to follow that difficult requirement. However, it is unavoidable that even an average reader at that level will have to accept some concepts without further detailed background. Gratefully, the authors are careful enough to state that explicitly, what is going on and why, and to offer a good, minimal list of references to follow at the end of each chapter, so that the reader can attempt studying the details. Various of these references are freely available in the internet as expository or review papers. There are also problems at the end of each chapter, suitable to self-study, as they are of the type: "prove", "show", "derive", "compute"... I believe that some of these problems will be regarded somewhat difficult for an undergraduate student. They are however excellent complements to the main text and should be seriously attempted.

The book is very pleasant to read and very clear. It is also amazingly concise and objective. I really like the way the authors expose every subtlety behind the theory; the "tips" and analogies offered throughout the text are really excellent, and effectively helped me to finally understand a few concepts which were confusing to me until recently.

The reader should, however, be advised that the contents are intrinsically advanced. It is definitely not for the common reader, it is a technical book. It is not an easy field anyway, as Loop Quantum Gravity obviously requires deep knowledge of quantum mechanics and general relativity, as well as several advanced mathematical concepts. But be sure that the authors will teach you what are the minimal required elements of these pre-requisites, so you will at least be aware of them and be able to pursue them further by yourself.

I highly recommend this book for anyone with complete undergraduate courses in physics and mathematics. With my own main background in astrophysics, I can say this book is also a great introduction for astronomers/astrophysicists/cosmologists who never studied Loop Quantum Gravity. A good complement in that regard (applications) would be Bojowald's books "Canonical Gravity and Applications: Cosmology, Black Holes, and Quantum Gravity" and "Quantum Cosmology: A Fundamental Description of the Universe", apart from the more advanced books already cited above (e.g., the obligatory and excellent books by Rovelli, Kiefer, Thiemann...). Finally, there is of course freely available review material in the arxiv site.

Congratulations to the authors for the great, concise, effective presentation of this challenging field to students and interested researchers coming from other fields.
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5.0 étoiles sur 5 the first step on a thousand mile journey 28 avril 2013
Par arpard fazakas - Publié sur Amazon.com
Format:Relié|Achat vérifié
Many non-experts who are interested in physics know that the current theory of gravity, Einstein's general theory of relativity, stands apart from the theories of the other three fundamental forces, the electromagnetic, weak nuclear, and strong nuclear forces, in that the former is a classical theory whereas the latter are quantum theories. Physicists like to unify things, so they would like to have the theory of gravity be a quantum theory as well, so they can then have a "theory of everything". In addition to being satisfying on a philosophical and esthetic level, this would also potentially be able to explain what's going on at the center of black holes and at the "beginning" of the Big Bang, for which general relativity gives a singularity, an unphysical point of infinite energy density indicating that general relativity is no longer properly describing the physical reality in these situations.

One approach to a quantum theory of gravity is the famous (perhaps infamous) "string theory". Another approach, the approach discussed in this book, is loop quantum gravity, in which a more traditional approach to quantizing the gravitational field is employed. In a nutshell, loop quantum gravity is a canonical quantization of a modification of the Hamiltonian formulation of general relativity originally developed by Arnowitt, Deser, and Misner in the early 1960s ("ADM formalism"), said modification being the replacement of the position and momentum variables used by ADM with a new set of variables introduced by Ashtekar in the 1980s. Canonical quantization refers to the quantization procedure based on the Hamiltonian originally developed by Dirac in the 1920s and further developed by him in the 1950s. Loop quantum gravity uses a "loop representation" which has as a key result that there is a minimum allowed length, area, and volume in the universe, i.e, these quantities are quantized. This in turn leads to the result that the universe has a minimum size, and if we play the movie of cosmic expansion backwards, we reach this minimum size before we reach the singularity, and the universe starts to expand again, the so-called "Big Bounce". Also, the relation between the surface area and entropy of a black hole reduces to a relationship between the number of area quanta which make up the surface area and the entropy.

This book is directed at the advanced undergraduate level, and aims to fill a gap in the pedagogy of this subject, which requires much more math and physics background to really understand than any undergraduate would have. As a result, it takes a very simplistic approach and should be considered no more than a very preliminary introduction to the topic.

The first part of the book covers all the basic background concepts needed to understand the program of loop quantum gravity, including general relativity, the generalized Hamiltonian with constraints, and canonical quantization. It then goes on to discuss the ADM formalism, Ashtekar variables, the loop representation, and applications of loop quantum gravity to cosmology and black hole thermodynamics. It ends with a very honest evaluation of the limitations and incompleteness of the theory at the present time. Loop quantum gravity is still a work in progress, and although there have been many important advances in terms of formulating a theory, there is as yet no validation experimentally, nor any obvious path to such a validation.

You will not really understand loop quantum gravity when you finish this book, only understand a very superficial version of it "dumbed down" for the intended readership of this book, but still extremely formidable in terms of its demands on the reader mathematically speaking. If you haven't already had at least an introductory exposure to general relativity, quantum mechanics, Lagrangian and Hamiltonian mechanics, and quantum field theory, you're in for some very tough sledding indeed. If you have this background, after you finish this book you will be prepared to delve more deeply into the topic if you have the time and inclination. Included are references to more advanced texts as well as important review papers to guide this further exploration.

I give this book 5 stars for identifying a pedagogical need, clearly defining the intended readership and the goals, and carefully describing the inevitable limitations and gaps in trying to present such a sophisticated, difficult topic to a relatively unprepared audience.
1 internautes sur 1 ont trouvé ce commentaire utile 
4.0 étoiles sur 5 An Alternative To String Theory 13 décembre 2013
Par D. Mills - Publié sur Amazon.com
Format:Relié|Achat vérifié
Loop quantum gravity is an alternative to the string theory approach for quantizing the gravitational field. I purchased this volume as part of a program of self-study in quantum gravity, mainly because the string theories (which also encompass quantum physics, and are touted as being a unifying theory of all physical forces) have yet to provide testable predictions of new physics, despite their relative popularity within theoretical physics circles. (A reader seeking sophisticated background in the strings vs. loop quantum theory would make a good investment in Roger Penrose's 'The Road to Reality'. For a decidedly anti-string treatment, Lee Smolin, a physicist at Princeton, has written several books outlining his skepticism regarding superstrings, in prose that is considerably less mathematical than Penrose.)

Returning to the book at hand, Prof. Gambini is an engaging writer whose treatment of early chapters has motivated me to jump headlong into the more involved material in the second half of the book. As such, I am at the beginning of my work, and this review reflects a relatively fresh understanding of aspects of loop quantum gravity. Early chapters handle the basic results of Riemannian geometry and metrics in curved spaces that are relevant to General Relativity (GR). These are the tools of classical GR, which is well established as a valid descriptor of gravitation as we experience it billions of years after the Big Bang. I was fortunate enough have an undergraduate course in GR, without which I might have been snowed by the tensors and connections (mathematical constructs) necessary for the basic study of GR as we know it. A technically sophisticated novice would benefit from a study of basic GR as handled by Weinberg (which I own, and like, though some consider it 'old fashioned') or Wald (which I do not have, but is a popular GR text). As I move into later chapters involving Lagrangian densities and Hamiltonians (which lie in the realm of classical and quantum mechanics), I have found it valuable to have Sakurai's 'Advanced Quantum Mechanics' and Ryder's 'Quantum Field Theory' on hand. In summary, then, this is not a book for the layman, and fellow readers who embark on this will want to have advanced physics texts at their disposal.

The loop vs. string controversy will undoubtedly continue. In the meantime, I plan to move to more advanced texts on the subject of loop quantum gravity, when my basic understanding of the subject is sufficient. I would like to turn the clock ahead a decade, to see what transpires in in this field. Since practical time travel is not yet perfected, I'll just have to wait.
3.0 étoiles sur 5 The scaling of difficulty is just too drastic 17 mai 2014
Par Nate - Publié sur Amazon.com
Format:Relié|Achat vérifié
The book starts off assuming you don't understand special relativity. About 10 pages later we're on Yangs-Mills theory. I don't exactly know how to present this material at a lower level, but the approach taken here doesn't cut it. You can't teach QFT in one page. Can't teach constrained Hamiltonian theory in two pages.

I give it three stars for the attempt, but I don't actually think it's possible to teach LQG at an undergraduate level.
4.0 étoiles sur 5 Four Stars 27 juillet 2014
Par W. G. Davies - Publié sur Amazon.com
Format:Format Kindle|Achat vérifié
Excellent introductory text for loop quantum gravity. Gives necessary background and defines notation. Has excellent up-to-date references.
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