[.ca] String Theory: Volume 1, An Introduction to the Bosonic ... (ISBN 0521672279)

very thorough and complete:
Polochinski presents upto date developments (mostly in 2nd volume) in string theory such as D-branes and dualities that are not discussed in Green, Witten, Schwarz's Superstring theory text. However, I found GWS's arguments easier to follow because they were intuitively and physically motivated. Although Polchinski's books lack physical insights, he more than makes up for them by completeness of the material, mathematical rigor and helpful exercises. However, I highly recommend that you first get Di Francesco's conformal field theory and read chapters 3-7 , 10 and 12 to get a better feel for stuff like state-operator mappings, Virasoro algebra, OPE's, etc. Although Polchinski claims the books are pretty much self-contained, I would say QFT (probably around lvl of 1st vol. of Weinberg) and GR are min prereq and some knowledge of SUSY, rep. theory of Lie alg, alg. toplogy wouldn't hurt. Lastly, the first edition had many many typos but corrections are frequently updated and you can download them through a website whose address is given in the book (the address in the book has a typo and should read "ucsb").

Very thorough and upto date:
The two volumes introduce many important recent developments in string theory not covered in Green, Schwarz & Witten's Superstring text such as D-branes, dualities, etc. However, I found GSW's treatment of basic materials easier to follow because the authors try to explain things intuitively. Although many physical insight in Polchinski's book is sacrificed, it makes up for them through completeness and mathematical rigor. However, I highly recommend that you read Di Francesco et al's conformal field theory book (read chapters 3-7, 10 and 12-13) to get a better feel for stuff like operator state mapping, OPE's, Virasoro algebra, vertex operators, etc. Of course a good course in QFT, GR and some basic familiarity with SUSY, Rep. theory, & some algebraic topology are probably a prereq although Polchinski claims the book is pretty much self-contained. Lastly, the book suffers a little from numerous typos (atleast the 1st edition) but corrections are updated frequently on a ucsb website address.

The best introduction to strings.:
I think there is no other book with so clear and precise explanations of string theory. All equations are carefully derived, all non-trivial conclusions are reached by a sequence of trivial thoughts. It exhibits the author's great pedagogical talent.

Good try, but too dense:
Lets face it, string theory is a difficult subject. But the only reason this book is the best string theory text is because they are all lousy. What it comes down to is string theory is too new for a good textbook writer to have tackled the task. What has happened, is string theory is currently populated by a small group of elite geniuses. So some of these elite geniuses take to writing a book, which turns out to be clear to other geniuses, but maybe not so clear to others, who are nonetheless capable of learning the theory. This happens in all fields, you will find that modern quantum mechanics books are much more readable than volumes written by the founders of the theory. Polchinski has clear writing, but can you solve the problems? If it seems clear but solving the problems is a mystery, it isn't a good book. Why can't people put in lots of examples? Why can't they include solutions to at least odd numbered problems? If they went to all the trouble to write the book they could at least do that. After all the goal is to teach, not to be mysterious. What needs to happen is some physicist with a talent for writing needs to A)Write an undergraduate level text on field theory, and B)write a more accessible book about string theory aimed at people who aren't at the level of Weinberg intelligence wise.

Enlightening text on a murky topic:
This book succeeds in what seems to be the impossible. It actually presents a clear, up to date, and entertaining version of a field that is still very much in a state of active research and is still, after all these years, on quite uncertain ground. By studying this, the reader who thinks intelligently about the material presented will be able to form his/her own opinions on this still somewhat controversial topic and will be able to converse intelligently with others who have opinions on the topic. I know that for me personally, this text opened up beautiful ideas which, to a large extent, are still unexplored. Before I read this book, my gut feelings about the topic were that it was rather dubious at best, but now that I understand (I think) the basic ideas of the field, I feel quite comfortable in it, indeed almost as if it is completely natural. What I think is one of the best things about this book is that it does not assume the pretense that string theory is on firm ground, that everything is quite certain and that string theory HAS to be the final theory of nature in all its glory. I find this attitude EXTREMELY pretensious and annoying. Instead, it simply covers what we know about string theory, and explains in detail just why it is consistent, and why it offers an explanation for what we see in nature. In short, it leaves just enough room for the imagination of an intelligent reader to philosophize as to the meaning of the theory and as to its ultimate place in nature As for practical details, it seems to me that the reader should at the very least have a firm understanding of Quantum Field Theory (at least at the level of Weinberg's first volume, see my review on that modern masterpiece), and to a lesser extent of General Relativity, before even attempting to tackle this. I know that I myself, despite the fact that I have read several texts on QFT, had to reread several sizeable chunks of the book to fully digest it.