




Lectures on SeibergWitten Invariants (Lecture Notes in Mathematics) [Paperback]
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Item description for Lectures on SeibergWitten Invariants (Lecture Notes in Mathematics) by John D. Moore...
In the fall of 1994, Edward Witten proposed a set of equations which give the main results of Donaldson theory in a far simpler way than had been thought possible. The purpose of these notes is to provide an elementary introduction to the equations that Witten proposed. They are directed towards graduate students who have already taken a basic course in differential geometry and topology. Promise Angels is dedicated to bringing you great books at great prices. Whether you read for entertainment, to learn, or for literacy  you will find what you want at promiseangels.com!
Item Specifications...
Pages 112
Est. Packaging Dimensions: Length: 9.21" Width: 6.06" Height: 0.31" Weight: 0.49 lbs.
Binding Softcover
Release Date Apr 18, 1997
Publisher Springer
ISBN 3540614559 ISBN13 9783540614555

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More About John D. Moore


John D. Moore is an associate preofessor of Health Sciences at American Military University. He is a licensed clinical professional counselor in the state of Illinois and board certified in addictions. He contributes regularly to nationally syndicated magazines on topics related to mental and physical health. A native of Chicago, he lives on the city's north side.
John D. Moore was born in 1943.
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Reviews  What do customers think about Lectures on SeibergWitten Invariants (Lecture Notes in Mathematics)?
 good introduction to SeibergWitten theory Jul 11, 2008 
First of all, this review is for the first edition only. Depending on whether the front matter is being included in the page count, the second edition appears to have either 4 or 15 more pages. If I can get access to this book online for free (all of Springer's Lecture Notes in Mathematics books are available online now, and depending on your University they may be freely downloadable) I'll update my review later.
This was the second book published on SeibergWItten gauge theory, just after John Morgan's The SeibergWitten Equations and Applications to the Topology of Smooth FourManifolds. (MN44). Since then, 2 more books devoted to the subject also have been published: Nicolaescu's Notes on SeibergWitten Theory (Graduate Studies in Mathematics) and Marcolli's SeibergWitten Gauge Theory. As Moore states in his preface, the purpose of this book was to make the subject of gauge theory accessible to secondyear graduate students who have studied differential geometry and algebraic topology and to prepare them for more advanced treatments, such as that of Morgan. Thus 2/3 of the book is devoted to preliminary material on vector bundles, connections, characteristic classes, hodge theory, spinors, clifford algebras, Dirac operators, and the AtiyahSinger index theorem, although if a student really has studied differential geometry already (and you really shouldn't be learning it from this book), vector bundles and connections should be familiar. The third chapter introduces the SeibergWitten equations and establishes standard results about their moduli spaces (see my review of John Morgan's book for a brief explanation of what gauge theory is if you are unfamiliar with this terminology), such as compactness, generic smoothness, and orientability. This then allows the SW invariants to be defined, which are subsequently computed for Kaehler surfaces. Finally, a few topological results on 4manifolds are deduced, much more easily than with the older Donaldson gauge theory.
The preliminary material that is covered in the first 2 chapters is done rather well, with an explicit representation frequently used for the Clifford algebra to make the calculations more clear (in contrast to the more formal presentation of Morgan). The introduction to the AtiyahSinger index theorem in particular is good, with it being applied to give easy proofs of Rohlin's theorem, Lichnerowicz theorem, and (a sketch of) the Hirzebruch signature theorem.
His coverage of the properties of the SW moduli space is not as thorough as that of Morgan, but he does give a very compact proof of compactness (albeit in the simply connected case only). The treatment of Sobolev spaces and elliptic estimates is rather inadequate, which is an unexpected shortcoming in a book that aims to be an introduction to gauge theory  the reader needs to follow up with his references (such as Freed and Uhlenbeck's Instantons and FourManifolds (Mathematical Sciences Research Institute Publications); Donaldson and Kronheimer's The Geometry of FourManifolds (Oxford Mathematical Monographs) is far, far beyond the level of this book). His explanation of how to apply the SardSmale theorem to deduce the smoothness of the moduli space for generic perturbations is excellent, something that is sorely lacking in Morgan (and moreover Moore defines the SW equations with the perturbations already included, which avoids repetition). Moore also does a good job of explaining the mechanics of proofs of orientability in gauge theory, probably the most uninteresting part of the theory. He does, however, leave out such important steps as demonstrating that the quotient space in which the moduli space is defined is a smooth Hausdorff manifold (except at reducible points), or proving (rather than just stating) that the invariants are independent of the Riemannian metric on the underlying manifold. His derivation of the homotopy type of the quotient space is clearer than Morgan's, although he only states it for the simply connected case, which makes a big difference. There is also no discussion at all of wallcrossing formulas, as b+ is assumed to be > 1 in the definition of the invariants, which limits the applicability of the results a little.
For the applications of SW invariants, more is covered than in Morgan (but for more restrictive cases), such as a simple proof of (part of) Donaldson's Theorem that the only negative definite unimodular form represented by a compact smooth simply connected 4manifold is I (this proof occupies virtually the entire book of Freed and Uhlenbeck), which shows that not all topological 4manifolds carry a smooth structure. Finally some invariants for some Kaehler surfaces (in much less generality than in Morgan) are calculated, following a trick that Witten used in his original paper, and as a corollary, an example is found (relying heavily upon other algebraicgeometric references) of a compact 4manifold with an infinite number of smooth structures.
There aren't an excessive number of typos/errors in the book, but the ones that are present tend to be more apt to confuse. For example, on pg. 57, in the equation between equations 2.10 and 2.11, the letter e appears twice where a gradient sign (a "nabla") with an e subscript was intended. On pg. 64, in the 4th equation from the bottom, the first term on the RHS should be 2, not 1. On pg. 76, in the third line from the top, the subscript on W should be , not +. Also on pg. 76, 2 paragraphs up from the Transversality theorem, it should read "codimension being = dim(Ker(D...," not <= as is stated. Near the bottom of pg. 77, the words "for F=0" should be added after "dF is surjective." On pg. 79, in the line above the last displayed equation, the V should have a subscript 1. And on pg. 80, the word injective should be replaced with surjective (which of course is a big difference).
Overall, this is probably the best introduction to SeibergWitten gauge theory for those who are not familiar with YangMills/Donaldson theory. It constitutes good preparation for being able to move on to more advanced works, such as Morgan, Marcolli, or the many reasearch papers in the field. On the other hand, for anyone with a stronger background in differential geometry and anlysis to begin with, you should be able to breeze through this book very quickly. Nicolaescu's newer and larger book is far more comprehensive and even more oriented toward novices, but it is a bit overly large and difficult to follow, so for a first taste of the subject Moore is probably superior.
   A good introduction Dec 19, 2002 
This book is a short and elementary introduction to the SeibergWitten equations, which created quite a stir back in 1994 when they were first proposed. The book is elementary enough that it could be read by someone without a background in the intricacies of the geometry and topology of 4dimensional topological and smooth manifolds, but the results can be better appreciated if one already has such a background. A background in quantum field theory, specifically the guage theory of the strong interaction, called quantum chromodynamics, will also help in the appreciation of the book. A lot of work has been done in elucidating the properties of the SeibergWitten equations since this book was written, but the book could still serve as an introduction to these developments. The author gives a brief introduction to the use of SeibergWitten equations in chapter 1, along with a review of the background needed from the theory of vector bundles, differential geometry, and algebraic topology needed to read the book. All of this background is pretty standard, although the appearance of spin structures may not be as familiar to the mathematicianreader, but completely familiar to the physicist reader. Detailed proofs of the main results are not given, but reference to these are quoted. Also, the theory of characteristic classes is outlined only briefly so no insight is given as to why they work so well. In particular, the reason for the vanishing of the second StiefelWhitney class as a precondition for the manifold having a spin structure is not given. In chapter 2, the author goes into the spin geometry of 4manifolds in more detail. After discussing the role of quaternions in this regard, spin structures are defined. A spin structure on a manifold M, via its cocycle condition, give two complex vector bundles of rank two over M. The complexified tangent bundle can thus be represented in terms of these vector bundles, which are themselves quaternionic line bundles over M. The author also defines spin(c) structures, and shows how, using an almost complex structure, to obtain a canonical spin(c) structure on a complex manifold of complex dimension two. The spin(c) structure also allows a construction of the "virtual vector bundles" W+, W, and L, for manifolds that do not have a spin structure. These bundles play a central role in the book. Clifford algebra becomes meaningful on the direct sum W of W+ and W, and spin connections can be defined on W. In particular given a unitary connection on a complex line bundle L over a spin manifold M, one can obtain a connection on the tensor product of W and L. When M is not a spin manifold, this is still possible but one must use the "square" L^2 of L. One can then define the Dirac operator over the sections of this tensor product, which the author does and extends it to one with coefficients in a general vector bundle. The author then discusses, but does not prove, the AtiyahSinger index theorem and the Hirzebruch signature theorem. These theorems, the author emphasizes, are proved in the context of linear partial differential equations, and give invariants of 4manifolds. This sets up the discussion in chapter 3, which deals with the problem of how to find invariants of 4manifolds if one works in the context of nonlinear partial differential equations. Those familiar with the Donaldson theory, which was done using the (nonlinear!) YangMills equations, will understand the difficulties of this approach. The strategy of the nonlinear approach as outlined by the author is to show that the solution set of a nonlinear PDE is compact and a finitedimensional compact manifold. The solution set depends on the Riemannian metric, but its cobordism class does not, and this may give a topological invariant. The fact that it is defined in terms of a PDE might give a way of distinguishing smooth structures. The SeibergWitten theory is one method for doing this. The SeibergWitten equations are nonlinear, but the nonlinearity is "soft" enough that it can be dealt with. They arise in the context of oriented 4dimensional Riemannian manifolds with a spin(c) structure and a positive spinor bundle W+ tensored with L. A connection on L^2 and a section of this spinor bundle are chosen to satisfy these equations, which involve the selfdual part of the connection. One also needs to work with the "perturbed" Seiberg Witten equations, where a selfdual twoform is added. The moduli space of the solutions to the perturbed SeibergWitten equations is shown to form a compact finitedimensional manifold. The proof follows essentially from the Weitzenbock formula, the Sobolev embedding theorem, and Rellich's theorem. Sard's theorem shows that the moduli space is smooth and the Fredholm theory shows it is oriented. The SeibergWitten invariants are associated to virtual complex line bundles over the 4manifold, and when the dimension of the selfdual harmonic twoforms is greater than or equal to 2, and the dimension of the moduli space is even. Their definition does involve the Riemannian metric, but changing this metric only alters the moduli space by a cobordism. It is proved that oriented Riemannian manifolds with positive scalar curvature have vanishing SeibergWitten invariants. Kahler surfaces are shown to have positive SeibergWitten invariants, and the author proves that there is a compact topological manifold with infinitely many distinct smooth structures. Unfortunately though, an explicit example of one of these is not given. Such an example may be very important from the standpoint of physics, for the behavior of dynamical systems or quantum field theories might be very different for different smooth structures.   Write your own review about Lectures on SeibergWitten Invariants (Lecture Notes in Mathematics)
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