ADM-201 dump PMP dumps pdf SSCP exam materials CBAP exam sample questions

宇宙解密 S1 • E6 关于大爆炸的极地发现! – 译学馆
未登录,请登录后再发表信息
最新评论 (0)
播放视频

宇宙解密 S1 • E6 关于大爆炸的极地发现!

A Polarizing Discovery About the Big Bang!

光是一种波 并且它确实会在传递时沿着特定方向波动
Light is a wave, and as it travels it does its “waving” along a certain direction – its
即它的偏振
polarization.
和其他因素一样 偏振很大程度上影响了光的反射和散射
Polarization, among other things, heavily influences the way light bounces and scatters
这就是为什么水平偏振光会被湖面或者汽车挡风玻璃反射
– that’s why horizontally polarized light reflects off of a lake or car windshield,
反过来 这也是有垂直偏振镜的太阳镜可以挡光的原因
which in turn is why sunglasses with a vertical polarizing filter can block that light.
在初生宇宙的热等离子体中 光四处被电子反射
And in the hot plasma of the baby universe, light was bouncing off of electrons left and
直到等离子体冷却到变得透明
right – until the plasma cooled enough to become transparent so the light could start
光才开始在空间传播
traveling through space.
但在开始超过一百三十亿的旅程之前
But before heading out on its 13+ billion year journey, this light bounced one last
这束光被等离子体持续反射 每一个光子的移动方向
time off of the plasma, and the direction each photon went was influenced by how its
与它的偏振有关 而偏振则与等离子体确切的温度 密度以及运动相互作用
polarization interacted with the precise temperature, density and motion of the plasma.
因此我们测量来自宇宙背景辐射的光的偏振
So if we measure the polarization of light coming from this cosmic background radiation,
就可以了解大爆炸
it can tell us about the big bang.
细节上很复杂 粗略的说 早期宇宙等离子体中的固定部分
The details are complicated, but roughly speaking, clumps in the plasma of the early universe
行程了平行或垂直于从热到冷方向的偏振 而微动部分
created polarization aligned along or across the direction from hot to cold, while jiggles
则产生了与由热到冷方向成45度角的偏振
created polarization at 45° angles to the hot-cold direction.
这里的微动部分 我指的是空间的伸展和压缩
And by jiggles I mean the stretching and squeezing of space due to gravitational waves passing
这是由引力波通过造成的
through.
无论如何 从位于南极的BICEP望远镜得出的结果看 我们
Anyway, starting with the results from the BICEP telescope at the South Pole, we see
发现虽然偏振中的大部分来自于早期宇宙的固定部分
that while a majority of the polarization came from clumps in the early universe, about
但其中大约百分之十五来自于微动部分
15% of it seems to come from jiggles.
这种微动很重要 它可以在比一秒短得多的时间里产生
And these jiggles are a big deal – they were caused just fractions of fractions of a second
通过引力场的量子波动进入宇宙生命中
into the life of the universe by quantum fluctuations of the gravitational field, so not only does
所以他们的发现第一次证实了引力确实是量子力学现象
their discovery mark the first confirmation that gravity is indeed a quantum mechanical
还使我们能追寻到三十八万年前
phenomenon, but it also opens the door for us to look 380,000 years farther back than
宇宙的初生之时
ever before, into the very birth of our cosmos.
祝贺BICEP项目 但愿他们的成果
Congrats to the BICEP collaboration! – assuming of course, that their results are confirmed
能被其他实验验证
by other experiments.

发表评论

译制信息
视频概述

解释光的偏振与大爆炸之间的联系

听录译者

收集自网络

翻译译者

ID552499

审核员

审核团MG

视频来源

https://www.youtube.com/watch?v=4IlBNJbCzfk

相关推荐