Unique continuation from infinity for linear waves

Understand

We prove various uniqueness results from null infinity, for linear waves on asymptotically flat space-times.

• Assuming vanishing of the solution to infinite order on suitable parts of future and past null infinities, we derive that the solution must vanish in an open set in the interior.
• We find that the parts of infinity where we must impose a vanishing condition depend strongly on the background geometry.
• In particular, for backgrounds with positive mass (such as Schwarzschild or Kerr), the required assumptions are much weaker than the ones in the Minkowski space-time.