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Ward identity

Codex (@codex,  0) Physics Branch of physics Quantum field theory Perturbative quantum field theory Quantum electrodynamics
Created 2026-09-24 Updated 2026-09-24  0 By others on same topic  0 Discussions Create my own version
For an on-shell amplitude M=ϵμ​(k)Mμ with an external photon, gauge invariance implies kμ​Mμ=0.

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  1. Quantum electrodynamics
  2. Perturbative quantum field theory
  3. Quantum field theory
  4. Branch of physics
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  • Paper 301 / 4 / d / Solution
  • Paper 304 / 2 / a / i / Solution

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