Name: 布萊恩-格林：尋找隱藏的尺度 (Brian Greene: The Search For Hidden Dimensions)
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Brian Greene: We have found, over the last hundred years,

程度副詞

that left-right, back-forth, and up-down,

the three dimensions that we all are immersed within,

we move through freely in day-to-day life...

that there may be more than those three dimensions

And, we have found that, at least theoretically,

certain problems of physics, all of a sudden,

of the twentieth century, around roughly 1920,

when a German mathematician Theodor Kaluza

was studying Einstein's theory of gravity,

it's called the General Theory of Relativity,

in one theoretical package. So, he found a way of unifying

You move through the world, and you want to give some information

a cross street, and a height, a floor number.

If you want to meet somebody, that would be the data

The ideas of these higher dimensional theories

would be that that's not enough information.

You have to give those three pieces of information

plus more to really nail down where you are.

A very natural question, when confronted with this strange idea,

of more than left-right back-forth and up-down, is

well we immediately see those three dimensions,

And this is a real puzzle. It's a real problem

that people have come up with very interesting

If the math of your theory is suggesting more dimensions

but you don't see them, where are they hiding?

And one of the places that they may be hiding

It may be that those other dimensions are all

around us just like the three that we know about,

but they're tightly curled up, to a very very small size.

So tiny, that we can't see it with the naked eye

or even with our most powerful equipment to date.

And, often people get confused 'what do you mean by a small,

And all I mean by that is, if you're a little tiny ant,

and you're walking along one of these tiny dimensions

you circle around back to your starting point very quickly

Like, a sphere, or like a little tiny circle

and you go around it you come back to your

starting point, and if that circle or that sphere

is so tiny that we don't have the visual acuity to pick it out,

those dimensions can be all around us, and yet be invisible.

So according to these ideas if I, you know, if I take my hand

and I sweep it in front of my face, I wouldn't just be moving in the

obvious dimensions that we can all see with the naked eye,

I'd also be in some sense moving around those other

tiny dimensions, I'd just be returning to my starting point

over and over again so quickly that on average, I wouldn't even

have recognized that I took the journey at all.

To me the most exciting thing that one can do with one's life, really

is try to, get some sense of how we got here.

Where did the universe come from? Where did life come from?

These are the big questions, that frame existence.

And, what we are doing in physics and in string theory in particular,

The real motivation, the driving force behind what we do

behind these ideas of extra dimensions and strings and quantum mechanics

and general relativity we are all trying to figure out

And the current laws of physics, remarkably, take us back to a

fraction of a second after the beginning.

But the current laws breakdown. So we are really working hard

to find laws that don't breakdown under any circumstance

The early universe was very hot, it was very dense

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布萊恩-格林：尋找隱藏的尺度 (Brian Greene: The Search For Hidden Dimensions)

reality

start

point

tiny