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介绍了电磁相互作用条件下Dirac协变导数的扩展。从量子场论的角度审视了整体规范变换下不变的Lagrange密度函数L,要使它在定域规范变换下也是不变的,则必须对其进行变化。如果将Dirac协变导数扩展为,这样电磁场的出现就是一个必然的结果。本文用更一般的形式总结了Dirac协变导数扩展的原则,最后做出引入标量场的猜想,这为自发破缺对称性理论的进一步研究提供了一个思路。
The expansion of Dirac covariant derivative under electromagnetic interaction conditions is introduced. From the perspective of quantum field theory, we examine the invariant Lagrange density function L under the global canonical transformation, which must be changed if it is invariant under the local canonical transformation. If the Dirac covariance derivative is extended to such an electromagnetic field is an inevitable result. This paper summarizes the principle of Dirac covariate derivative expansion in a more general form, and finally makes the conjecture of introducing scalar field, which provides a train of thought for the further study of spontaneous breaking symmetry theory.