Fully non-linear gravitational wave simulations from past to future null-infinity

Understand

We present the first numerical simulations of asymptotically flat space-times whose computational domain includes past and future null-infinity.

• As an application, we explore the scattering of a gravitational wave in a black hole space-time.
• The study is conducted in the fully non-linear regime using an initial boundary value problem formulation of Friedrich's generalised conformal field equations.
• We calculate the Bondi energy, Bondi news and gravitational information at both past and future null-infinity and discuss their relationships.