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Supergravity
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Review
Endorsement: "Over the last four decades, the theory of supergravity has emerged as a central ingredient in the search for the still-elusive unified theory of nature, and has led to many deep results in mathematical physics. This comprehensive, accessible text, written by the pioneers of the subject, fills a gap in the literature and will play an essential role in our future efforts to understand nature." Andrew Strominger, Harvard UniversityEndorsement: "Freedman and Van Proeyen's Supergravity is a much-needed introduction to the union of general relativity with supersymmetry, written by two of the leaders in the field. The presentation is clear, well planned, and thorough. It begins with the necessary background in field theory and geometry, and runs through recent applications to AdS/CFT duality." Joseph Polchinski, Kavli Institute for Theoretical Physics, University of California, Santa BarbaraEndorsement: "Finally there is an up-to-date textbook available that introduces supergravity to present and future generations of students. The authors take great care to explain the basic concepts of supersymmetry and supergravity in a pedagogical way, starting from standard notions in field theory and general relativity. Highly recommended." Bernard de Wit, Institute for Theoretical Physics, Utrecht UniversityEndorsement: "Supergravity is a keystone of modern theoretical physics, connecting Einstein's gravity, superstring theory, and proposed extensions of the Standard Model of particle physics. It is also a subject known for its forbidding technical difficulties. In this book, Freedman and Van Proeyen decode the structure of supergravity. Beginning from lucid explanations of the basic geometrical and gauge symmetries, they show how to build up supergravity theories systematically in four and in higher dimensions." Michael E. Peskin, SLAC, Stanford UniversityEndorsement: "Supergravity by D. Freedman and A. Van Proeyen is the most complete and most concise text book on the basic mathematical formalism of supergravity, its solutions and applications for the AdS/CFT correspondence on the market. This book will become an indispensable tool for every student and researcher, who wants to learn and to work with this beautiful subject." Dieter Lüst, Ludwig-Maximilians-University Munich and Max Planck Institute for PhysicsEndorsement: "This book is an excellent introduction to the rich and many-faceted topic of supergravity. Students will find it to be thorough and detailed and all around an outstanding book to learn from. More senior researchers will find it to be a very valuable resource." Edward Witten, The Institute for Advanced Study, Princeton" Two of the inventors and masters of supergravity - Dan Freedman and Antoine Van Proeyen - have produced a superb, pedagogical textbook that covers the classical theory in considerable depth. Overall, this is a masterful introduction to supergravity for students and researchers alike, which I strongly recommend." John March-Russell, University of Oxford for CERN Courier"Freedman and Van Proeyen have written an excellent book. As may be expected from two of the experts who played a significant role in the development of many of the topics described, the explanation of the material is very clear, including details of derivations and applications of the results." Douglas J. Smith, Mathematical Reviews
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Book Description
Written by two of the most respected workers in the field, this is the first-ever authoritative and systematic account of supergravity. It provides a thorough introduction to the fundamentals of supergravity and with numerous exercises, examples and its range of applications, it is ideal for both Ph.D. students and researchers.
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Product details
Hardcover: 626 pages
Publisher: Cambridge University Press; 1 edition (May 7, 2012)
Language: English
ISBN-10: 9780521194013
ISBN-13: 978-0521194013
ASIN: 0521194016
Product Dimensions:
7.7 x 1.3 x 10 inches
Shipping Weight: 3 pounds (View shipping rates and policies)
Average Customer Review:
4.5 out of 5 stars
8 customer reviews
Amazon Best Sellers Rank:
#127,908 in Books (See Top 100 in Books)
Supergravity is notoriously complex and difficult to tackle through the original literature. This book makes it far easier, but still not easy by any means. The focus is on D=4, N=1,2, although there is also a nice chapter on D=11, and a less useful survey of other dimensions.D=4, N=1 coupled to arbitrary scalar and gauge multiplets is developed in great detail using the superconformal gauging technique, which seems rather interesting in its own right, especially given the increasing prominence of conformal methods over time. The book goes deeply into the many tricks and conventions which make the supergravity original literature difficult to understand.The book is quite self-contained, and readers who have not studied any form of supersymmetry before could do worse than to start here. Global susy is covered rather well, albeit without much attention to superspace techniques.A strong feature of the book is the large number of exercises, which are well-selected to develop understanding while not being terribly difficult.After N=1, the book moves on to a very useful, but also very compact discussion of D=4, N=2. This is really the climax of the book, because it pulls together all previous topics, including the symplectic structure of abelian gauge duality, which has a good treatment in chapter 4. The N=2 discussion was a little too abbreviated for me to really get it all, but I still found it very valuable and I think the authors made good choices in how to cover it given the space constraints.My biggest quibble is with the authors' choice to conclude the book with a lengthy chapter on ADS/CFT, because (although well-written) it is still too brief to be really useful. Instead of that I would have preferred to see more on the supergravities in other dimensions, especially D=6 and D=10, and on the reduction of D=11 and resulting noncompact symmetries which are so important for string theory. All the same, the material in the book is a good start towards these subjects.The book is carefully written with few typos, and there is a webpage listing a (small number of) errata. Two to keep an eye out for are Ex. 14.8, and Eq. 16.12, which leads to a puzzle with the note on p. 332.Did I mention that it is not an easy book? I spent close to four months reading it, including reading into some of the references (and I might add that the referencing is another valuable feature of the book). I read through ch. 20, then realized I had lost the thread and went back to ch. 10 to start again. One supplemental reference I would definitely recommend is Polchinski's treatment of general spinors, in the appendix to his String Theory, vol II. The paper of Bagger and Witten (ref. 95) is a good supplement to the N=2 discussion.
Purchased the Kindle eTextbook. The contents of the book are excellent but there are some problems with the Kindle for PC application. The size of the equations cannot be changed. Only the size of the text can be changed. The equations look good on my 15 inch Windows 10 laptop, which has 1366x768 resolution. Initially, the equations were tiny on my 11 inch Windows 10 2-in-1, which has 1920x1080 pixels. This was with version 1.17.1 of the Kindle for PC reader. But then Amazon just came out with version 1.19.2 (46095) of the Kindle for PC reader, which largely fixes the problem. It can be downloaded from amazon.com/gp/kindle/pc/download. If one has an older version already installed, the library and settings are not lost when installing this latest version. The equations still can’t be resized though. Evidently, the equations are small graphic images rather than being in a mathematics markup language, so on a device with high pixel density, they can appear tiny unless resized. Also, it seems that the Digital Rights Management (DRM) license only allows four devices for this book, and that, if used, the Kindle Cloud reader counts as one of them. I have experienced problems with DRM when trying to use the Kindle Cloud reader, so I no longer use it and unregistered it as one of my devices. I had problems with DRM requiring me to remove and re-download the book. Since Amazon is continuing to improve the reader, one will benefit from this even after the purchase. And I assume that if any improvements are made to the eTextbook itself, one can always remove and re-download it to get the benefits of those improvements.
Those readers who have prior knowledge of supergravity probably gained it in graduate school when the subject was popular a couple of decades ago. Before superstring theory took off, supergravity theories were one attempt at unification that explicitly had to jointly deal with bosons and fermions when gravity is present. The subject was rife with painstaking calculations and "index gymnastics", and large artist sketchpads were used to keep track of these calculations. The physics behind supergravity theories it seems was taking a back seat, and it was difficult to see if there indeed were much physics at all in these theories. The subject has come a long way since then, even though it seemed to be overshadowed by superstring theories. One of the reasons for its current popularity is the discovery of the AdS/CFT correspondence (which is discussed in this book) and questions from cosmology.The authors of this book give an excellent overview of the subject, and anyone could gain a lot from reading this book, with that gain also including relevant discussions of the physics. Even for those readers with prior exposure to supergravity theories, there may be a lot of questions that they still need answering. Some of these questions include:1. Why are there no "consistent" interactions for particles of spin greater than or equal to 5/2?2. Is maximal N = 8 supergravity ultraviolet fine to all orders in perturbation theory and where is there a consistent proof of this?3. Why is the Bogomol'nyi-Prasad-Sommerfield (BPS) property useful in finding "tractable" first-order field equations?4. Why even bother to incorporate conformal transformations into supergravity? The authors show how the understanding supergravity can be done using the superconformal algebra, and the discussion revolves around showing that conformal symmetry can be gauged. Also, it is shown that gauge fixing of a superconformal gauge multiplet coupled to a chiral multiplet lends5. What really is the role of auxiliary fields in supergravity?6. Can Fierz relations, Fierz rearrangements etc be given a more geometric foundation or are they merely bread-and-butter calculation tools in supergravity? In this book Fierz rearrangements are viewed as the key to doing calculations in supergravity, along with Majorana flip relations. The authors contrast the use of Fierz relations in showing supersymmetry in an interacting supersymmetric theory, and in restricting the fermion type in the theory, versus the use of superspace formulations, which they do not use in the book. The exception to this is when they rely on the superspace formulation in obtaining the auxiliary fields for the supersymmetric Yang-Mills vector multiplet.7. Why are there no interacting field theories in Minkowski space for N greater than or equal to 9?8. Does torsion result in any physical effects? The authors show how a 4-point contact term arises in the Feynman diagrams in fermion-fermion scattering amplitudes, and that a fermion theory with torsion is physically inequivalent from a fermion theory without torsion. Readers familiar with "tele-parallel" theories of gravity may find this discussion interesting.9. Why does local supersymmetry imply that there is no Christoffel connection term in the spin-3/2 action?10. Why is D = 11 the largest space-time dimension allowed for supergravity? The authors give reasons that involve dimensional reduction. The authors refer to D = 11 supergravity as "fixed and unalterable" in that it does not allow any more matter multiplets or cosmological modifications.Many of these questions are answered in this book, but it also contains special insights that at least for the reviewer were very helpful in improving intuition and insight into supergravity theories. In this regard, some of the highlights of the book that should assist serious readers in their understanding of supergravity include:1. "Linearly realized" symmetries form n-dimensional representations of a connected Lie group. Readers familiar with gauge theories and effective field theories will contrast this with "non-linear realized" symmetries.2. In the classical realm, iterated Lie algebra variations must be compatible with the symmetry transformations by Poisson brackets of conserved Noether charges, but in quantum physics they must be simply unitary transformations.3. Lie algebras can be realized as differential operators on functions.4. Symmetry transformations act directly on fields. Just what objects symmetry transformations act on can be a source of confusion for those beginning their study of supersymmetry, gauge theories, and supergravity.5. Spinor representations are special representations of the Lorentz group, as distinguished from the defining representation.6. Majorana representations are very special in supergravity, in that they have real representations in D = 2, 3, 4, and 8. For generic D the gamma matrices are complex. One therefore speaks of Majorana spinors fields, and physically the anti-particles are not distinct from the particles. In the book Majorana spinor fields are viewed as being more fundamental than complex Dirac fields. Supergravity and superstring theories in dimension 10 are based on Majorana-Weyl spinors.7. The statement that the Lorentz group is not compact has the implication that there are no finite-dimensional unitary representations and only spatial rotations are anti-hermitian.8. Fermion spin is the main reason for supersymmetry and supergravity theories. This may seem like a banal statement, but readers can gain an appreciation of just how special fermionic fields are when attempting to calculate with them in high dimensions. A good example of this in the book is the viewpoint that highest rank tensor elements of the Clifford algebra are a link between even and odd dimensions and the "chirality" of fermions. As the authors show, there are methods for obtaining the Clifford algebra in odd dimensions from the Clifford algebra in even dimensions.9. Supersymmetry requires bilinear expressions in spinors, and "barred" spinors are obtained using Majorana conjugates.10. The role of 'symplectic' Majorana spinors.11. To obtain non-trivial dynamics of theories based on Majorana spinors it is crucial that the Majorana fields are anti-commuting Grassmann variables; assuming commutativity will results in no dynamics at all.12. Any field theory based on a Majorana spinor field can be rewritten in terms of a Weyl field and its complex conjugate.13. Chiral transformations can be viewed as a kind of generalized U(1) symmetry that is compatible with the Majorana condition.14. The difference between "on-shell" and "off-shell" degrees of freedom is explained as the number of helicity states (on-shell) and the number of field components - gauge transformations.15. Duality acts as a symmetry in abelian gauge theory and in D = 4, duality transformations are members of the symplectic group.16. The field tensor in non-abelian gauge theories is not gauge invariant like it is in the abelian case but instead transforms according to the adjoint representations. This fact can be a source of confusion to those who are learning gauge theories for the first time.17. Supergravity is viewed as the gauge theory of global supersymmetry, and supergravity theories that are interacting need particular types of spinors. This forces the dimension to be less than or equal to 11.18. Supergravity theories are viewed as "atypical" gauge theories in that the gauge coupling to matter fields is to lowest order in the gravitational coupling only.19. The connection of 'R-symmetry' with chiral symmetry, in that it is a phase transformation of the fields of the chiral and anti-chiral multiplets.20. To be meaningful, supergravity must be incorporated into an interacting theory with spins 1 or 3/2.21. The need for using the frame (vierbein) field in theories where the fermions are coupled to gravity. Spinors play the key role here, since they are defined by their special transformation properties under Lorentz transformations.22. The fact that Killing symmetries are nonlinearly dependent on the fields.23. The view of general relativity as N = 0 supergravity.24. The origin of supergravity is viewed as a resulting from a requirement that supersymmetry holds locally, and conversely that any supersymmetric theory that includes gravity must have supersymmetry holding locally. Thus the local translation parameters must be viewed as diffeomorphisms and this is taken to be a sign that gravity is present.25. The gauge symmetries in supergravity are given by "soft" algebras, and not Lie algebras. The authors give an interesting discussion of "zilch" symmetries, which are transformation rules that vanish on solutions of the equations of motion, but are not uniquely defined.26. Curvature constraints imply that spin connections are composite gauge fields, in that they can be written in terms of the frame field and torsion tensor.27. The discussion on Kahler geometry, which is viewed as arising from the occurrence of multiplets.28. The fact that potentials in global supersymmetric theories are always positive definite, but in supergravity the gravitinos are gauge fields, and thus contribute negatively to the scalar potential.29. The need for a positive graviton kinetic energy is viewed as the need for non-compact symmetry groups.30. The use of Kahler manifolds is readily apparent in the construction of the general action of N = 1 supergravity coupled to chiral and vector multiplets via conformal and superconformal methods. One of these is the embedding Kahler manifold with conformal symmetry, which takes into account the Weyl multiplet and chiral multiplets . The others is the projective Kahler manifold for physical fields that results after gauge fixing and the making use of the field equations. The projective manifold is obtained from the embedding manifold by identifying points that lie on the orbits of vector fields that generate symmetries of the embedding manifold. The scalar fields of N =1 supergravity are modeled by the mathematical theory of projective Kahler manifolds. The embedding manifold has a Kahler potential and superconformal symmetry requires it to satisfy homogeneity conditions. The vanishing of the cosmological constant is viewed as a geometric condition placed on the Kahler metric. These results come under the topic of Kahler-Hodge manifolds, which are extremely important objects in mathematics also.31. A toy model is discussed that shows that gravitational effects appear at energy scales much lower than the Planck scale. This is due to the Kahler structure of the supergravity matter action.32. The role of 'special geometry' in constructing N = 2 supergravity. It has the property that the kinetic terms of scalars, gauge fields, and gauginos are determined from the imaginary parts of a holomorphic function, called a "pre potential". In D = 4, N = 2 supergravity there are hypermultiplets which play the role of chiral multiplets, and one obtains a 'hyper-Kahler' manifold and an "Obata" connectn. Interestingly, the hypermultiplets are dependent on a metric that is compatible with 3 complex structures. Readers can also see the appearance of symplectic transformations in this context, which are needed to understand the structure of special geometry.33. The AdS/CFT correspondence is discussed, but this discussion is rather hurried and disjointed, and the authors it might be fair to say are showing a little fatigue in this discussion. There is enough though to get one started in the understanding of this correspondence, but readers will have to have a solid understanding of conformal field theories and string theory to appreciate it. Some of the helpful insights gained from their discussion includes the view of the central charge as measure of the degrees of freedom of a theory, the discussion on holographic renormalization group flows, and why the superconformal SU(2,2|4) symmetry appears at the quantum level. The latter topic involves the use of "short" representations, which is explained as when the scale dimension of the primary operator is locked at a value determined by its R-symmetry properties. These are to be contrasted with "long" representations, wherein the primary scale dimension is restricted only by a lower bound due to unitarity. The authors view observables in AdS/CFT as being correlation functions of gauge invariant operators which are composites of elementary fields. These operators are classified via irreducible representations of SU(2,2|4) with the consequence that AdS/CFT is primarily interested in short representations.Note: This book was read and studied between the dates of November 2012 and April 2013.
Casually referred to in certain circles as 'La Biblia', this is by far the best way of learning off-shell supergravity. Sufficiently clear for self-study. On my quick-reference shelf.
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