An Exact Derivation of Conservation of Momentum for Quantum System Under Invariance of Translation in Space
Hu Xian · 2001
Symmetry in space and time lead to the conservation laws of energy and momentum,which are a general principle across all fields of physics So.it is of great importance to study symmetrization and conservation laws of mechanical system,While in most of general literatures and textbooks the derivations of conservation of momentum for quantum systems are made by infinitesimal translations in space,by approximate expansion of wave functions as the first order,or by means of the Lie symmetries.In this paper,the conservation of momentum is derived from the picture Schrdinger and the wave functions belonging to the translations in space are made to expand in power series and with the help of Lie symetries,the conservation of momentum is obtained.It is more precise than that in the literatures.