Asymptotic Entropy Bounds

Understand

We show that known entropy bounds constrain the information carried off by radiation to null infinity.

• We consider distant, planar null hypersurfaces in asymptotically flat spacetime.
• Their focussing and area loss can be computed perturbatively on a Minkowski background, yielding entropy bounds in terms of the energy flux of the outgoing radiation.
• In the asymptotic limit, we obtain boundary versions of the Quantum Null Energy Condition, of the Generalized Second Law, and of the Quantum Bousso Bound.