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※ 編輯: zeuklie 來自: 118.168.136.52 (07/30 17:51)
http://arxiv.org/abs/1007.2615v2
This paper discusses the quantum mechanics of closed timelike curves (CTC)
and of other potential methods for time travel. We analyze a specific
proposal for such quantum time travel, the quantum description of CTCs based
on post-selected teleportation (P-CTCs). We compare the theory of P-CTCs to
previously proposed quantum theories of time travel: the theory is physically
inequivalent to Deutsch's theory of CTCs, but it is consistent with
path-integral approaches (which are the best suited for analyzing quantum
field theory in curved spacetime). We derive the dynamical equations that a
chronology-respecting system interacting with a CTC will experience. We
discuss the possibility of time travel in the absence of general relativistic
closed timelike curves, and investigate the implications of P-CTCs for
enhancing the power of computation.
關於結論 如果時間旅行者的行動會造成時間矛盾，
則會有很大的機率發生一些狀況 阻止時間旅行者的行動。
例如，當時間旅行者企圖槍殺自己的祖父，則很有可能發生一些微細的量子現象
造成手槍卡彈或子彈轉彎，使時間旅行者無法殺害自己的祖父，阻止時間矛盾產生。
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