Yang-Mills Theory(Non-Abelian gauge theory)

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Pythagoras0 (토론 | 기여)님의 2020년 12월 28일 (월) 04:55 판 (→‎메타데이터: 새 문단)
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introduction

  • This is not a quantum theory.
  • This can be regarded as a generalization of theory of electromagetisms., i.e. bundle + connections
  • looks like the coordinate invariance of gravity theory
  • Gauge theory
  • Usually, non-abelian gauge theory is called the YM theory.
    • QCD is one example.



basic concepts

  • connection
  • curvature



original Yang-Mills model

  • three kinds of photon
    • one ordinary photon
    • two electrically charged photons with spin 1 which is physically impossible to exist
  • massless gauge fields
    • for example, electromagnetic field(the only example at that time)



weak force

recipe

  • prepare Dirac fields
  • start with the free Dirac Lagrangian
  • we demand the Lagrangian to be invariant under the SU(N) local gauge transformations
  • structure constants are needed
  • self-interaction of gauge fields starts to appear



Yang-Mills potential

  • dual role
    • a field in space-time
    • operator in the isotopic-spin space



quantization of Yang-Mills theory



books



expository


articles



encyclopedia

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