Name: 重新思考現實。空間、時間和引力 (Rethinking Reality: Space, Time and Gravity)
Uploaded: 2021-01-14T07:05:23.000Z
Duration: 51 min 55 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

And all of you here are in for a treat today.

程度副詞

is going to tell us about one of the most amazing things

And that's the measurement of gravity waves.

And he will describe it to us, and at the end of the evening

But Sam is a theorist working on gravitational physics

He's interested in the strongest gravitational

and electromagnetic fields in the universe,

which occur near black holes and neutron stars.

And you heard a little bit about this last week.

Sam applies techniques from diverse communities,

relativity, astrophysics, particle physics

to study the physical processes occurring

His PhD is from Chicago, and his postdoctoral work

And we're really lucky to have Sam as one of our faculty

Well, what a pleasure to be here in this beautiful hall,

in this great university in this wonderful city.

the story of how I came to the University of Arizona.

When you're a young theoretical physicist, you apply widely

is a little different from a normal job interview.

It's really more like 20 or 30 interviews right

If you're lucky, in the midst of all this

Now, I had a thing I did with deans on job interviews.

The first thing I would do when I got in the dean's office

is I'd take out a book and I'd start reading it.

That would get the conversation started, usually

And then I'd say, you tell me one thing--

if you're in a vehicle moving at the speed of light

and you turn on your headlights, do they work?

But the comedian Steven Wright has his interviewee in his joke

First, it pushes us outside of our comfort zone, right?

works from living with light all around you,

but as soon as you ask a question involving where

Maybe you don't understand light so well,

because you're used to not moving that fast.

The second reason Steven Wright's question is a good one

It's not some vague, can you make light stop?

It's some pretty precise sequence of actions.

You get in your car, you get up to light speed,

and you pull the lever that would normally

These kinds of questions that are reasonably precise

He called them gedanken experiments in German.

This is not exactly the kind of thought experiment

And the answer to this particular conundrum

Einstein didn't mean your car won't go that fast.

nothing can go that fast-- not your car, not a truck,

not a motorcycle, not a plane, not a spaceship,

we have lots of those in my neighborhood right now--

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重新思考現實。空間、時間和引力 (Rethinking Reality: Space, Time and Gravity)

obvious

stretch

experiment

spectrum