Twistor strings for $ \mathcal{N} $ = 8 supergravity

This paper presents a worldsheet theory describing holomorphic maps to twistor space with $$ \mathcal{N} $$ N fermionic directions. The theory is anomaly free when $$ \mathcal{N} $$ N = 8. Via the Penrose transform, the vertex operators correspond to an $$ \mathcal{N} $$ N = 8 Einstein supergravity multiplet. In the first instance, the theory describes gauged supergravity in AdS4. Upon taking the flat space, ungauged limit, the complete classical S-matrix is recovered from worldsheet correlation functions.