Averaged null energy condition in spacetimes with boundaries

@article{Fewster2007AveragedNE,
title={Averaged null energy condition in spacetimes with boundaries},
author={C. Fewster and K. Olum and M. Pfenning},
journal={Physical Review D},
year={2007},
volume={75},
pages={025007}
}

The averaged null energy condition (ANEC) requires that the average along a complete null geodesic of the projection of the stress-energy tensor onto the geodesic tangent vector can never be negative. It is sufficient to rule out many exotic phenomena in general relativity. Subject to certain conditions, we show that the ANEC can never be violated by a quantized minimally coupled free scalar field along a complete null geodesic surrounded by a tubular neighborhood in which the geometry is flat… Expand