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  • As far as we know, time only moves in one directionforward – but if you could

    據我們所知,時間只有一個方向--前進,但如果你能

  • loop back to visit the universe at an earlier point in time, a famous paradox arises.

    循環回訪宇宙在更早的時間點,一個著名的悖論出現了。

  • What if you killed your grandfather when he was a child?

    如果你在你爺爺小時候就把他殺了呢?

  • Then your father or mother wouldn't have been born, so you wouldn't have been born, so you

    那你的父親或母親就不會出生,所以你也不會出生,所以你

  • wouldn't have been able to go back in time to kill your grandfather in the first place.

    當初也不可能回到過去殺死你爺爺。

  • Paradox.

    悖論。

  • The simplest resolution to the grandfather paradox is that when you go back in time,

    祖父悖論最簡單的解決方法是,當你回到過去。

  • you're actually not going back into your own history but to a copy, and everything you

    你實際上不是回到你自己的歷史,而是回到一個副本,而你的所有東西

  • do there influences the new alternate future of that universe, not your own past.

    做有影響新的備用未來的宇宙,而不是你自己的過去。

  • But that's boring, because it just avoids the paradox.

    但這很無聊,因為它只是避免了悖論。

  • If what you do when you go back in time actually influences your own past, and the effects

    如果你回到過去的時候所做的事情其實會影響到你自己的過去,而這種影響

  • of your time travel do loop back to the present...future...pastno problem.

    你的時間旅行可以循環到現在... 未來... 過去 - 沒問題。

  • Let's just follow the paradoxical timeline through BEYOND its paradoxical conclusion.

    我們就按照矛盾的時間線,通過BEYOND其矛盾的結論。

  • You go back in time, kill your grandfather, thus you aren't born so you can't go back

    你回到過去,殺了你的爺爺,是以你沒有出生,所以你不能回去了

  • in time, thus your grandfather isn't killed, thus you are born, so you go back in time

    在時間上,所以你的爺爺沒有被殺,所以你出生了,所以你回到了過去。

  • and kill your grandfather, and so on...

    殺了你爺爺,等等... ...

  • I'm showing this as a linear series of events but really it's two entangled histories happening

    我把它顯示為一個線性的系列事件,但實際上它是兩個糾纏在一起的歷史事件

  • in parallel.

    並行。

  • Is that even possible?

    這有可能嗎?

  • Well, I don't know about the time travel part, but subatomic particles regularly do multiple

    好吧,我不知道時間旅行的部分, 但亞原子粒子經常做多個。

  • different things in parallel – it's called quantum superposition and is responsible for

    這就是量子疊加,也是我們的目標。

  • the weirdness of the double slit experiment, many properties of atoms and molecules, fusion

    雙縫實驗的詭異之處,原子和分子的諸多特性,核聚變。

  • in the sun's core, and so on.

    在太陽的核心,等等。

  • So if the universe were to exist in a superposition of two statesyour grandfather is alive

    所以,如果宇宙是存在於兩種狀態的疊加,你爺爺還活著。

  • and your grandfather is deadthen the natural result is a superposition of two states:

    而你爺爺已經死了--那麼自然的結果就是兩種狀態的疊加。

  • you're born and able to go back in time to kill your grandfather, and you're not born.

    你出生了,能夠回到過去殺死你的爺爺,而你卻沒有出生。

  • And the natural result of these is a superposition of two statesyour grandfather is dead

    而這些的自然結果就是兩種狀態的疊加--你爺爺死了。

  • and your grandfather is alive – and so, at least from a logical perspective, this

    而你的祖父還活著 所以,至少從邏輯上來說,這...

  • looping timeline is entirely consistent and there's no paradox.

    循環的時間線是完全一致的,不存在悖論。

  • And a similar paradox-free solution can be obtained by viewing the problem as a steady-state

    而把問題看成一個穩態的問題,也可以得到類似的無悖論解。

  • solution to a Markov chainbut I won't go into that here.

    馬爾科夫鏈的解--但我在這裡不談這個。

  • Now of course nothing about these solutions to the grandfather paradox suggests that closed

    當然,這些解決祖父悖論的方法並不表明,封閉的

  • time loops are actually possiblein fact, some of the implications this kind of time

    時間循環實際上是可能的--事實上,這種時間循環的一些影響。

  • loop have in the study of complexity theory seem to suggest that time loopsand thus

    循環在複雜性理論的研究中似乎表明,時間循環--因而也是

  • time travel into the pastmust be impossible.

    時間旅行到過去--一定是不可能的。

  • But the main point is sometimes we think a situation creates a paradox when it doesn't,

    但最主要的是,有時候我們認為一種情況會產生矛盾,其實不然。

  • and really the only paradox is how our thinking can be twisted enough to dream up time-traveling

    唯一的悖論是我們的思維怎麼會被扭曲,以至於夢到穿越時空

  • murderous grandsons, but not twisted enough to think about twisting time.

    殺人的孫子,但還沒有扭曲到想扭曲時間的地步。

As far as we know, time only moves in one directionforward – but if you could

據我們所知,時間只有一個方向--前進,但如果你能

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B2 中高級 中文 爺爺 悖論 循環 回到 祖父 時間

祖父悖論的解決方案 (Solution to the Grandfather Paradox)

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    Summer 發佈於 2021 年 04 月 01 日
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