Variational problem for the frenkel and the Bargmann-Michel-Telegdi (BMT) equations

A. A. Deriglazov

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


We propose Lagrangian formulation for the particle with value of spin fixed within the classical theory. The Lagrangian is invariant under non-Abelian group of local symmetries. On this reason, all the initial spin variables turn out to be unobservable quantities. As the gauge-invariant variables for description of spin we can take either the Frenkel tensor or the Bargmann-Michel-Telegdi (BMT) vector. Fixation of spin within the classical theory implies O(h)-corrections to the corresponding equations of motion.

Original languageEnglish
Article number1250234
JournalModern Physics Letters A
Issue number1
Publication statusPublished - 10 Jan 2013


  • Bargmann-Michel-Telegdi equation
  • Frenkel equation
  • Semiclassical description of relativistic spin
  • Theories with constraints

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Astronomy and Astrophysics

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