中国物理B ›› 2011, Vol. 20 ›› Issue (1): 11101-011101.doi: 10.1088/1674-1056/20/1/011101

• THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS • 上一篇    下一篇

Noether's theory of Lagrange systems in discrete case

吕洪升1, 张宏彬2, 顾书龙2   

  1. (1)Department of Mathematics, Chaohu University, Chaohu 238000, China; (2)Department of Physics , Chaohu University, Chaohu 238000, China
  • 收稿日期:2010-02-28 修回日期:2010-07-01 出版日期:2011-01-15 发布日期:2011-01-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 10872037) and the Natural Science Foundation of Anhui Province, China (Grant No. 070416226).

Noether's theory of Lagrange systems in discrete case

Lü Hong-Sheng(吕洪升)a), Zhang Hong-Bin(张宏彬)b)†, and Gu Shu-Long(顾书龙)b)   

  1. a Department of Mathematics, Chaohu University, Chaohu 238000, China; b Department of Physics , Chaohu University, Chaohu 238000, China
  • Received:2010-02-28 Revised:2010-07-01 Online:2011-01-15 Published:2011-01-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 10872037) and the Natural Science Foundation of Anhui Province, China (Grant No. 070416226).

摘要: In this paper, Noether theory of Lagrange systems in discrete case are studied. First, we briefly overview the well-known Noether theory of Lagrange system in the continuous case. Then, we introduce some definitions and notations, such as the operators of discrete translation to the right and the left and the operators of discrete differentiation to the right and the left, and give the conditions for the invariance of the difference functional on the uniform lattice and the non-uniform one, respectively. We also deduce the discrete analog of the Noether-type identity. Finally, the discrete analog of Noether's theorem is presented. An example was discussed to illustrate these results.

Abstract: In this paper, Noether theory of Lagrange systems in discrete case are studied. First, we briefly overview the well-known Noether theory of Lagrange system in the continuous case. Then, we introduce some definitions and notations, such as the operators of discrete translation to the right and the left and the operators of discrete differentiation to the right and the left, and give the conditions for the invariance of the difference functional on the uniform lattice and the non-uniform one, respectively. We also deduce the discrete analog of the Noether-type identity. Finally, the discrete analog of Noether's theorem is presented. An example was discussed to illustrate these results.

Key words: discrete Lagrange system, difference functional, Noether-type identity, Noether-type theorem

中图分类号:  (Symmetry and conservation laws)

  • 11.30.-j
45.20.Jj (Lagrangian and Hamiltonian mechanics)