Ambitwistor strings and the scattering equations on AdS3×S3

Abstract

AbstractWe construct an ambitwistor string that describes Type II supergravity on AdS3×S3with pure NS flux. The background Einstein equations ensure that the model is anomaly free. The spectrum consists of supergravity fluctuations around this background, with no higher string states. This theory transforms the problem of computingn-point tree-level amplitudes on AdS3into that of understanding an$$ {\mathfrak{sl}}_2 $$sl2Gaudin integrable system, whose representations are determined by the dual boundary operators and whose spectral parameters correspond to the worldsheet insertion points. The scattering equations take a similar form to flat space, withn(n −3)/2 parametersτijparametrizing the eigenvalues of the Gaudin model.