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  Explicit calculation of bosonic string Weyl invariance at one loop

+ 2 like - 0 dislike

I have been trying to do all the calculations in the Green, Schwarz and Witten Superstring Theory textbook.

At the end of chapter 3, the author did one-loop calculation for Weyl invariance for the bosonic string, in section 3.4.2 and 3.4.5. In the latter section more fields were included, and not much calculation detail was given.

The actions are

$S_1=\frac{-1}{4\pi\alpha'}\int d^2\sigma\sqrt h h^{\alpha \beta}\partial_\alpha X^\mu \partial_\beta X^\nu g_{\mu \nu}$

$S_2=\frac{-1}{4\pi\alpha'}\int d^2\sigma \epsilon^{\alpha \beta}\partial_\alpha X^\mu \partial_\beta X^\nu B_{\mu \nu}$

$S_3=\frac{1}{4\pi}\int d^2\sigma \sqrt h \Phi (X^\rho) R^{(2)}$

I consider those one-loop calculations to be very good exercise, but as a beginner in string theory I find myself not able to do them.

Therefore may I ask if there are some notes/papers in literature that give explicit calculation or point out key steps? Thank you very much!

This post imported from StackExchange Physics at 2014-04-14 16:23 (UCT), posted by SE-user Han Yan

asked Dec 14, 2013 in Theoretical Physics by Han Yan (110 points) [ revision history ]
edited Apr 20, 2014 by dimension10
I found a reference but it is not easy to read... I let you judge : Ref paragraph $3.2$ p $21$. Maybe somebody has a simplest reference.

This post imported from StackExchange Physics at 2014-04-14 16:23 (UCT), posted by SE-user Trimok

1 Answer

+ 0 like - 0 dislike

Thanks to @Trimok , the reference he provided gives some detailed calculation. To see one of the missing Feynman diagrams (you can draw others once you understand that) and more detailed calculation of the leading order (not one loop), you can also check http://www.itp.phys.ethz.ch/research/qftstrings/archive/13FSProseminar/LEEre_Guns which gives more useful math tricks.

This post imported from StackExchange Physics at 2014-04-14 16:23 (UCT), posted by SE-user Han Yan
answered Dec 18, 2013 by Han Yan (110 points) [ no revision ]
Yes, seems simpler to read...

This post imported from StackExchange Physics at 2014-04-14 16:23 (UCT), posted by SE-user Trimok

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