NS-NS spacetimes from amplitudes

A bstract Recent work has shown how on-shell three-point amplitudes in gauge theory and gravity, representing the coupling to massive particles, correspond classical limit curvature spinors of linearised solutions. This connection, made explicit via KMOC formalism split metric signature, turns double copy scattering into Here, we extend this framework universal massless sector supergravity, which is complete pure theory. Our extension relies on a Riemann-Cartan incorporating dilaton B-field. In setting, can determine most general arising from product distinct solutions, say dyon $$ \sqrt{\mathrm{Kerr}} Kerr . gives double-copy interpretation gravity solutions type Kerr-Taub-NUT-dilaton-axion. We also discuss heterotic gravity. Finally, describe for relates others literature, namely (i) why it an momentum space analogue convolutional prescription, (ii) straightforward prescription position possible certain vacuum