Superluminal censorship

Details Superluminal censorship Superluminal censorship

1998-10-07

arxiv.org/abs/gr-qc/9810026v2

Nucl.Phys.Proc.Suppl. 88 (2000) 267-270

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, uses espcrc2.sty. Significant revisions: (1) the perturbative analysis is extended; (2) the non-perturbative analysis

Scientific paper

10.1016/S0920-5632(00)00782-9

We argue that ``effective'' superluminal travel, potentially caused by the tipping over of light cones in Einstein gravity, is always associated with violations of the null energy condition (NEC). This is most easily seen by working perturbatively around Minkowski spacetime, where we use linearized Einstein gravity to show that the NEC forces the light cones to contract (narrow). Given the NEC, the Shapiro time delay in any weak gravitational field is always a delay relative to the Minkowski background, and never an advance. Furthermore, any object travelling within the lightcones of the weak gravitational field is similarly delayed with respect to the minimum traversal time possible in the background Minkowski geometry.

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