时序保护猜想
缘起
在一篇1992年的論文中[1]，霍金用隱喻的說法「Chronology Protection Agency」（時序保護機構/機制）來闡釋物理定律不允許宏觀尺度的時間旅行，由此避免時間悖論。他認為：
| 似乎有一个时序保护机制，防止封閉類時曲線的生成，从而让历史学家得到安全的宇宙。 It seems that there is a Chronology Protection Agency which prevents the appearance of closed timelike curves and so makes the universe safe for historians. |
这个想法可能来源于科幻作品中的时间警察等机构。
參考文獻
- Hawking, S.W. (PDF). Phys. Rev. D. 1992, 46: 603-611 [2015-02-27]. （原始内容 (PDF)存档于2015-02-27）.
書目
- Matt Visser, "The quantum physics of chronology protection" in The Future of Theoretical Physics and Cosmology: Celebrating Stephen Hawking's 60th Birthday by G. W. Gibbons (Editor), E. P. S. Shellard (Editor), S. J. Rankin (Editor)
- Li-Xin Li, "Must Time Machine Be Unstable against Vacuum Fluctuations?", Class.Quant.Grav. 13 (1996) 2563-2568.
外部連結
- https://web.archive.org/web/20101125122824/http://hawking.org.uk/index.php/lectures/63
- Is time travel allowed? — Kip Thorne discusses time travel in general relativity, and the basis in quantum physics for the chronology protection conjecture
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