College Physics ›› 2019, Vol. 38 ›› Issue (5): 5-.doi: 10.16854 /j.cnki.1000-0712.180476

Previous Articles     Next Articles

Three kinds of ordering formulas for vacuum projection operators and their applications

ZHANG Chun-zao1,REN Gang1,FAN Hong-yi2   

  1. 1.School of Electronic Engineering,Huainan Normal University,Huainan,Anhui 232038,China; 2.Department of Material Science and Engineering,University of Science and Technology of China,Hefei,Anhui 230026,China
  • Received:2018-08-28 Revised:2018-12-27 Online:2019-05-20 Published:2019-06-10

Abstract: Three kinds of ordering formulas for the vacuum projector | 0?? 0 | ,i .e.,normally ordered-,antinormally

ordered- and Weyl ordered-forms,are derived systematically and concisely. It is further deduced that

many more operator identities play important roles in calculating various physical quantities.

Key words: vacuum projection operators, normal ordering, anti-normal ordering, Weyl ordering