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chronology protection conjecture
The chronology protection conjecture is a conjecture by physicist Stephen Hawking that the laws of physics are such as to prevent time travel on all but submicroscopic scales. The permissibility of time travel is represented mathematically by the existence of closed timelike curves. The chronology protection conjecture should be distinguished from chronological censorship under which every closed timelike curve passes through an event horizon, which might prevent an observer from detecting the causal violation.
==Origin of the term==
In a 1992 paper, Hawking uses the metaphorical device of a "''Chronology Protection Agency''" as a personification of the aspects of physics that make time travel impossible at macroscopic scales, thus apparently preventing time paradoxes. He says:
The idea of the Chronology Protection Agency appears to be drawn playfully from the Time Patrol or Time Police concept, which has been used in many works of science fiction such as Poul Anderson's series of Time Patrol stories or Isaac Asimov's novel ''The End of Eternity'' (though in Asimov's novel the time travelers were constantly trying to make small changes to history to improve it, while preserving some broad features like a lack of atomic wars). "The Chronology Protection Case", an oft-reprinted novelette by Paul Levinson, posits a universe that goes so far as to murder any scientists who are close to inventing any means of time travel.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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