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锁定200年? 2023-02-18 18:54:58

刚才在油管看到一个节目中提到中国有个科幻片中有个叫智子的外星人将地球的量子力学锁定了200年。

是否会锁定200年我不知道,但已经锁定了100来年应该是不假。今天的量子力学所依据的最基本的动量守恒没有经验的依据,是空想出来的,哈密尔顿方程是类推出来的,拉格朗日函数是定义出来的。这样的科学你能相信它靠谱?

至于是否会再继续所100年以凑出中国的科幻片中的200年就不知道了。。。。。。

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下面这个视频中说狄拉克推导他的公式是为了总结前人的经验将薛定谔方程从低速推广到高速。。。。估计他在做节目之前懒得去了解一下狄拉克本人是怎么讲的。其实只要打开狄拉克1928年推导该方程的文章随便扫一眼狄拉克的原文(Dirac, P. A. M. (1928). "The Quantum Theory of the Electron". Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences. 117 (778): 610–624. ),就能知道狄拉克当初不是吃饱没事干去要泛泛地发展薛定谔方程,而是有着非常明确的“项目目标”的,那就是当时的量子力学理论提出的原子能级上只有一个电子(指的是泡利大师的理论)与实验结果之间的不一致:

The new quantum mechanics, when applied to the problem of the structure of the atom with point-charge electrons, does not give results in agreement with experiment. The discrepancies consist of “ duplexity ” phenomena, the observed number of stationary states for an electron in an atom being twice the number given by the theory. To meet the difficulty, Goudsmit and Uhlen- beck have introduced the idea of an electron with a spin angular momentum of half a quantum and a magnetic moment of one Bohr magneton. This model for the electron has been fitted into the new mechanics by Pauli,* and Darwin,f working with an equivalent theory, has shown that it gives results in agreement with experiment for hydrogen-like spectra to the first order of accuracy.


该网红还说狄拉克方程比海森堡的矩阵力学简单多了,因为不需要矩阵。。。他真应该至少去扫一眼狄拉克的文章,看看那里的矩阵有多复杂:


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