### Nekrasov Lecture Online I

#### Posted by urs

A while ago we had talked about (I, II, III) how gerbes of chiral differential operators make an appearance in Berkovits’ formulation of the superstring in terms of a curved $\beta -\gamma $-system of pure spinors. As Peter Woit has already noted on his blog, Nikita Nekrasov is currently lecturing on his latest preprint

Nikita Nekrasov
**Lectures on curved beta-gamma systems, pure spinors, and anomalies**

hep-th/0511008

in Jerusalem, and a quicktime video of his lectures is available online.

I have watched the first two parts, hoping to see some hints concerning open questions like those mentioned here. But no luck so far…