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**Twistor Origin of the Superstring**

Nathan Berkovits (ICTP-SAIFR/IFT-UNESP, Sao Paulo)

(Submitted on 8 Sep 2014)

After introducing a d=10 pure spinor λ

^{α}, the Virasoro constraint ∂x

^{m}∂x

_{m}=0 can be replaced by the twistor-like constraint ∂x

^{m}(γ

_{m}λ)

_{α}=0. Quantizing this twistor-like constraint leads to the pure spinor formalism for the superstring where the fermionic superspace variables θ

^{α}and their conjugate momenta come from the ghosts and antighosts of the twistor-like constraint.

...

We should compare this with Ichiro Oda's "Emergence of Superstring from Pure Spinor".