There is a sort of funny things that you hear people say that time doesn’t actually exist.
这也是物理学家在讨论的 我的意思是说 物理学家确实是开了一个研讨会
And it’s something that physicists argue about, I mean physicists actually have symposia
on the subject of is there such a thing as time, and it’s also
something that has a tradition in philosophy going back about a century.
But I think it’s fair to say that in one sense it’s a ridiculous come, it’s a ridiculous idea.
How can you say time doesn’t exist when we have such a profound experience of it,
first of all?
And second of all, we’re talking about it constantly.
I mean we couldn’t get – I can’t get through this sentence without referring to time.
I was going to say we couldn’t get through the day without discussing time.
所以很显然的是 当物理学家问到时间的存在性时 他们试着详细
So obviously when a physicist questions the existence of time they are trying to say something
specialized, something technical.
Einstein offers, Einstein or maybe I should say more properly Minkowski, his teacher and
和同时代的人 提出了时空的视觉 作为单一的个体 作为在过去和未来四维空间的限制
contemporary, offers a vision of space time as a single thing, as a four dimensional block
in which the past and the future are just like spatial dimensions, they’re just like
north and south in the equations of physics.
And so you can construct a view of the world in which the future is already there and you
can say, and physicists do say something very much like this that in the fundamental laws
of physics there is no distinction between the past and the future.
And so if you are playing that game you’re essentially saying time as an independent
thing doesn’t exist.
Time is just another dimension like space.
Again, that is in obvious conflict with our intuitions about the world.
我们度过每一天 假装过去已经结束 未来还未发生
We go through the day acting as though the past is over and the future has not yet happened
and might happen this way or it might happen that way.
We could flip a coin and see.
我们更倾向于相信我们的直觉 那就是未来还没有完全被定下来 因此
We tend to believe in our gut that the future is not fully determined and therefore is different
from the past.
但是物理学家会说 你知道的 很多我们用直觉感受到的事情
But physicists will say, and it’s certainly true that a lot of things that we feel in
our gut turn out not to be right, you know.
We feel in our gut that we’re sitting on a flat plane on a surface of something that’s
并且如果一个科学界走来告诉你 不 事实上你在
And if a scientist came along and told you that no you’re actually on the surface of
a giant spear that’s spinning at high speed and hurtling through space, and by the way
顺便 向上向下没有不同 除了来自重力的错觉
there’s no difference between up and down except any illusion that’s created by the
force of gravity, well you have to do some radical re-adjustment of your understanding
of the universe to accept that your first intuitions weren’t correct.
And so if a physicist comes to me and says do some re-adjustment.
面对它 未来对你来说与过去不同 但事实上物理学告诉我们的是一样
Face it, the future looks different from the past to you but actually physics tells us
the same, I at least acknowledged that I have an obligation to take that seriously
to listen to it.
And physicists do argue about these things and it’s fair to argue about it.
And it’s an argument that I take a position on in my time travel book because I thout I
had to or maybe I had a position and yet it’s got to be a quite high position.
And that’s what I recommend to readers of science fiction and to physicists to remember
that your views of these things are previsional.