Perturbative superluminal censorship and the null energy condition
作者:
Matt Visser,
Bruce Bassett,
Stefano Liberati,
期刊:
AIP Conference Proceedings
(AIP Available online 1999)
卷期:
Volume 493,
issue 1
页码: 301-305
ISSN:0094-243X
年代: 1999
DOI:10.1063/1.1301601
出版商: AIP
数据来源: AIP
摘要:
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. ©1999 American Institute of Physics.
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