Asymptotic Entropy Bounds

TL;DR

This paper derives boundary entropy bounds in asymptotically flat spacetime, linking radiation energy flux to entropy constraints at null infinity, and introduces boundary versions of key quantum energy conditions.

Contribution

It establishes boundary entropy bounds and quantum energy conditions for null hypersurfaces in flat spacetime, extending previous theoretical frameworks.

Findings

Derived boundary entropy bounds in flat spacetime.

Connected entropy bounds to energy flux of outgoing radiation.

Presented boundary versions of quantum energy conditions.

Abstract

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.