Wormholes, Time Machines, and the Weak Energy Condition
Morris, Michael S., Kip S. Thorne, and Ulvi Yurtsever
Physical Review Letters 61, no. 13 (1988): 1446
https://doi.org/10.1103/PhysRevLett.61.1446
“Normally theoretical physicists ask, “What are the laws of physics?”and/or, “What do those laws predict about the Universe?” In this Letter we ask, instead, “What constraints do the laws of physics place on the activities of an arbitrarily advanced civilization?” This will lead to some intriguing queries about the laws themselves.”
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