作者GiantPenis (海屌七号)
看板Physics
标题Re: [问题] 古典与量子 的角度
时间Mon Oct 27 01:37:00 2008
※ 引述《GiantPenis (海屌七号)》之铭言：
: ※ 引述《flyingwave (飞翔的波)》之铭言：
: : 请问下面这种说法正确吗
: : 古典: 根据之前1000000000次的经验 从100楼往1楼跳 一定会撞死 所以第1000000001次
: : 也一定会撞死
: : 量力: 第1000000001次 撞死的机率是 99.999999999%
: : 这槎说有错吗?
: 量子与古典 物理最大的不同
: 关键字：Quantum Fluction
: 请自行google
: 或是参考Wikipedia http://en.wikipedia.org/wiki/Quantum_fluctuation
: 类比拿来写写科普还可以，但不见得真的让你学到真正的观念～
google一下就有了，这写得很清楚...
http://universe-review.ca/R03-01-quantumflu.htm
In classical physics (appliable to macroscopic phenomena), empty space-time
is called the vacuum. The classical vacuum is utterly featureless. However,
in quantum mechanics (appliable to microscopic phenomena), the vacuum is a
much more complex entity. It is far from featureless and far from empty.
The quantum vacuum is just one particular state of a quantum field
(corresponding to some particles). It is the quantum mechanical state in
which no field quanta are excited, that is, no particles are present.
Hence, it is the "ground state" of the quantum field, the state of minimum
energy. The picture on the left illustrates the kind of activities going on
in a quantum vacuum. It shows particle pairs appear, lead a brief existence,
and then annihilate one another in accordance with the Uncertainty Principle.
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