## Posts Tagged ‘**String Theory**’

## Errata for Basic Concepts of String Theory by Blumenhagen, Lüst and Theisen

This is an unofficial errata for the book *Basic Concepts of String Theory* by** **Ralph Blumenhagen, Dieter Lüst and Stefan Theisen. I couldn’t find an official errata, but I’ll probably discontinue this at some point when I do run into one.

**Chapter 2: The Classical Bosonic String**

- Page 8. The line below equation 2.3. There should be two dots, one each on and in the definition of .

**Chapter 8: The Quantized Fermionic String**

- Page 213: Equation 8.56. There is only one charge conjugation matrix in odd dimension d = 2n+1, either or . To find out which one it is, for odd , determine : if this is even, exists; if it is odd, exists. So, equation 8.56 is wrong: one should use for odd , and for even .To derive this criterion, compute and observe that it equals in general, which determines whether or . For a quick list of charge conjugation matrices in various dimensions and their symmetry properties, see page 11 of http://www.nikhef.nl/~t45/ftip/AppendixE.pdf.

**Chapter 14: String Compactifications**

- Page 453: below equation 14.70. There’s an extra q after .
- Page 454: Equation 14.76. There’s an extra $\wedge$ after .
- Page 510: Equation 14.262. The on the right-hand side in the local Lorentz transformation of the vielbein should be .

**Chapter 18: String Dualities and M-Theory**

- Page 690: The expression for in the paragraph below equation (18.26) has extra indices. It is the contraction of with .

## Divergence Theorem in Complex Coordinates

The divergence theorem in complex coordinates,

(where the contour integral circles the region R counterclockwise) appears in the context of two dimensional conformal field theory, to derive Noether’s Theorem and the Ward Identity for a conformally invariant scalar field theory (for example), and is useful in general in 2D CFT/string theory. This is equation (2.1.9) of Polchinski’s volume 1, but a proof is not given in the book.

This is straightforward to prove by converting both sides separately to Cartesian coordinates , through

and using the Green’s theorem in the plane

with the identifications

There is perhaps a faster and more elegant way of doing this directly in the complex plane, but this particular line of reasoning makes contact with the underlying Green’s theorem in the plane, which is more familiar from real analysis.