10.12.2012 Views

String Theory and M-Theory

String Theory and M-Theory

String Theory and M-Theory

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Homework Problems 147<br />

PROBLEM 4.14<br />

Consider the ghost contributions to the super-Virasoro generators in the NS<br />

sector.<br />

(i) Work out the mode expansions for ghost contributions to Ln <strong>and</strong> Gr<br />

implied by Eqs (4.142) <strong>and</strong> (4.143).<br />

(ii) Prove that these generate a super-Virasoro algebra with ĉ = −10.<br />

PROBLEM 4.15<br />

Using the method sketched in the text, show that the BRST charge in<br />

Eq. (4.150) is nilpotent for the critical dimension D = 10.

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!