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祖父悖论(时间旅行)的解法 – 译学馆
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祖父悖论(时间旅行)的解法

Solution to the Grandfather Paradox

我们都认为时间只有一个方向—向前—但是
As far as we know, time only moves in one direction – forward – but if you could
如果你回到过去的某个时间点这样 一个著名的悖论就产生了
loop back to visit the universe at an earlier point in time, a famous paradox arises. What
如果你到你祖父的孩提时代并杀了他那么 你的父亲和母亲就不会出生了
if you killed your grandfather when he was a child? Then your father or mother wouldn’t
那你也不会出生了那也就不会有你去杀掉
have been born, so you wouldn’t have been born, so you wouldn’t have been able to go
你祖父这种事情存在了 这就是悖论
back in time to kill your grandfather in the first place. Paradox.
祖父悖论最简单的解释是只要你回来的时间与你离去的时间没有间隔
The simplest resolution to the grandfather paradox is that when you go back in time,
那么实际上你只是复制出另一个时间线
you’re actually not going back into your own history but to a copy, and everything you
你所做的一切只影响了这个新的时间线而非你的过去 但是这个解释有点无聊
do there influences the new alternate future of that universe, not your own past. But that’s
因为它只是避免了悖论
boring, because it just avoids the paradox.
如果你所做的影响到了你自己的过去
If what you do when you go back in time actually influences your own past, and the effects
那么你进行时间的旅行的就会对现在、未来、过去形成一个循环的影响 没问题 让我们先跟着
of your time travel do loop back to the present…future…past – no problem. Let’s just follow the paradoxical
悖论的时间线而不管悖论结果你穿越到过去 杀死你的祖父
timeline through BEYOND its paradoxical conclusion. You go back in time, kill your grandfather,
你就不可能出生所以你也不能穿越到过去 你也不能杀你的祖父

thus you aren’t born so you can’t go back in time, thus your grandfather isn’t killed,
现在你出生了并回到过去杀你的祖父 等等…
thus you are born, so you go back in time and kill your grandfather, and so on… I’m
我在这条时间线上描绘一系列事件让两件事放到一起
showing this as a linear series of events but really it’s two entangled histories happening
这些都可能吗?好吧 我也不太明白时间旅行的部分
in parallel. Is that even possible? Well, I don’t know about the time travel part, but
但亚原子粒子经常在平行范围内有不同行为
subatomic particles regularly do multiple different things in parallel – it’s called
它称之为量子叠加不可思议的双缝实验体现了这一原理
quantum superposition and is responsible for the weirdness of the double slit experiment,
许多原子 分子的性能 太阳核心的巨变等等
many properties of atoms and molecules, fusion in the sun’s core, and so on.
所以 如果有两个叠加的宇宙
So if the universe were to exist in a superposition of two states – your grandfather is alive
那么你祖父死亡和生存状态就是两个状态的叠加
and your grandfather is dead – then the natural result is a superposition of two states:
你出生 回到过去杀死你祖父 然后你就未能出世
you’re born and able to go back in time to kill your grandfather, and you’re not born.
那么自然结果就是两种叠加状态
And the natural result of these is a superposition of two states – your grandfather is dead
你祖父死了和活着的两种状态所以 单从逻辑角度来看
and your grandfather is alive – and so, at least from a logical perspective, this
这个循环的时间线完全一致 没有悖论
looping timeline is entirely consistent and there’s no paradox. And a similar paradox-free
另一个相似的解决办法是把整个问题看作马尔可夫链的稳定解
solution can be obtained by viewing the problem as a steady-state solution to a Markov chain
这我就不解释了
– but I won’t go into that here.
现在这些祖父悖论的解释是
Now of course nothing about these solutions to the grandfather paradox suggests that closed
时间循环确实存在实际上 这类时间循环的推断
time loops are actually possible – in fact, some of the implications this kind of time
在复杂性理论学术研究上都表明着有时间循环
loop have in the study of complexity theory seem to suggest that time loops – and thus
-即时间旅行回到过去-一定是不可能的但是最主要的一点是
time travel into the past – must be impossible. But the main point is sometimes we think a
有时我们会认为在一个不存在的时间点创造了一个悖论 但真正的悖论却是
situation creates a paradox when it doesn’t, and really the only paradox is how our thinking
我们的思维可以凭空假想出一个能够时间旅行的凶残孙子
can be twisted enough to dream up time-traveling murderous grandsons, but not twisted enough
但从未想过如何才能扭转时间
to think about twisting time.

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