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如何在笔记本上模拟宇宙

How to Simulate the Universe on your Laptop

分钟物理
This is the amazing and beautiful Millennium run.
这就是令人惊奇的 壮观的宇宙演化数值模拟
It’s a simulation of the large-scale evolution of the universe
它是对从大爆炸时期到现在
from just after the big bang all the way to the present.
宇宙大规模演化的模拟
The researchers at the Max Plank Institute in Germany who ran the simulation,
德国马克斯普朗克研究所 负责此项模拟的研究员
began with the latest observations of what the early universe looked like,
从最新资料中的早期宇宙的样子开始
and simulated the evolution of the universe forward in time,
模拟了宇宙随着时间的演化
to see how the tiny fluctuations in the density of the early universe
用来研究早期宇宙的微小密度波动
gave rise of the galaxies and galactic clusters of today.
如何形成了今天的星系和星团
As a testament to their success, the Millennium simulation looks strikingly similar to
有证据表明这项模拟十分成功 这个宇宙演化模拟
the actual universe here shown in the equally impressive 3D map of
与这里展示的3D地图中真实的宇宙十分相似
the universe created by the Sloan Digital Sky Survey.
这个同样惊艳的3D地图由斯隆数字巡天绘制
But the millennium run was no small feat.
但这个模拟并不简单
It contained over 10 billion simulated particles
它模拟了100亿个粒子
and ran on over 500 computers for a total of 350,000 hours,
在500多台电脑上 总共运行了35万小时
or 40 years, of processor time.
相当于40年的运算时间
Not to be outdone, here’s my version that I did on my laptop in only a few minutes.
我不甘人后 也花了几分钟在笔记本上做了这个版本的演化模拟
And I did the simulation using off-the-shelf video special effects software.
我是用现成的视频特效软件来进行模拟的
In fact, if you want to try this yourself,
事实上 如果你想自己尝试模拟一下
you can even download a free, fully-functional demo.
你甚至可以下载一个免费的功能齐全的模板
So how did I simulate the universe on my laptop?
那么 我是如何在笔记本上进行模拟的呢?
Simple – I began with a real image of the universe about 13.7 billion years ago,
很简单 我选了一张137亿年前宇宙真实的照片
and used it to tell a particle simulator
用来让粒子模拟器分辨
which particles should be lighter and which should be heavier.
哪些粒子应该更轻哪些应该更重
This simulates the slight variations of density of the early universe.
它模拟了早期宇宙密度的细微变化
Then I turned on a little bit of gravity, and watched the particles go.
然后我加上一点重力 观察这些粒子的运动
Now, it’s by no means the millennium simulation.
然而 这绝不是一样的宇宙演化模拟
For starters, it’s only two-dimensional, and the gravity isn’t physically accurate.
首先 这只是二维的而且重力也不精确
But nevertheless, here you have it:
但尽管如此 在这里你看到了结果:
the large scale of evolution of the universe as simulated on a laptop.
由笔记本模拟的宇宙大演化过程
For those of you interested in the particular details of
如果你们对粒子模拟的细节十分感兴趣
how to make this particle simulation in After Effects,
想知道如何用AE进行这样的粒子模拟
check out the tutorial here.
可以查看这里的教程
And if you just want more cool science, click here
如果你想知道更多有趣的科学知识 点击这里
to find out what would happenif we dug a tunnel through the earth and jumped in.
探索如果我们在地球上挖一个隧道并跳进去会发生什么
如果地球是空心的会怎样呢?

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视频概述

介绍了目前规模最大的宇宙演化数值模拟,及如何在笔记本上进行同样的模拟

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视频来源

https://www.youtube.com/watch?v=pP-C_B8nSmw

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