Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2009-10-29
Phys.Rev.D81:024038,2010
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
19 pages, 1 figure. Added 2 paragraphs to end of section 2
Scientific paper
10.1103/PhysRevD.81.024038
A null line is a complete achronal null geodesic. It is proven that for any quantum fields minimally coupled to semiclassical Einstein gravity, the averaged null energy condition (ANEC) on null lines is a consequence of the generalized second law of thermodynamics for causal horizons. Auxiliary assumptions include CPT and the existence of a suitable renormalization scheme for the generalized entropy. Although the ANEC can be violated on general geodesics in curved spacetimes, as long as the ANEC holds on null lines there exist theorems showing that semiclassical gravity should satisfy positivity of energy, topological censorship, and should not admit closed timelike curves. It is pointed out that these theorems fail once the linearized graviton field is quantized, because then the renormalized shear squared term in the Raychaudhuri equation can be negative. A "shear-inclusive" generalization of the ANEC is proposed to remedy this, and is proven under an additional assumption about perturbations to horizons in classical general relativity.
No associations
LandOfFree
Proving the Achronal Averaged Null Energy Condition from the Generalized Second Law does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Proving the Achronal Averaged Null Energy Condition from the Generalized Second Law, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Proving the Achronal Averaged Null Energy Condition from the Generalized Second Law will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-88780