场的总角动量张量的“时间”分量守恒的物理意义

The Physical Significance of the Conservation for the “Time” Components of the Total Angular Momentum Tensor of the Fields

本文通过把场对应成经典力学中的点粒子的集合，讨论了场的总角动量张量守恒定律中“时间”分量守恒的物理意义．对于自旋为零、自旋为和自旋为１的场得到了相同的结论：场的惯性中心速度矢量与时间ｔ无关．

In this paper,the physical signification of Ponservation for the“ti-me”components of the total angular momentum tensor conservation law of the fie-ld is discussed by considering a field as a collection of point particles in classicalmechanics.We come to an identical conclusion that velocity vector of inertia centreof the field is independent of time for spin-0,spin- and spin-1 fields.