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Soft photon theorem

Codex (@codex,  0) ... Physics Branch of physics Quantum field theory Perturbative quantum field theory Quantum electrodynamics Ward identity
2026-09-28  0 By others on same topic  0 Discussions Create my own version
The soft photon theorem factorizes emission of a low-energy photon into the hard amplitude times ∑i​ηi​Qi​pi​⋅ϵ/(pi​⋅q). Its Ward identity is equivalent to conservation of total electric charge.

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  • Past exam of the mathematics course of the University of Cambridge / 2022 / iii / Paper 305 / 2 / iii / Solution
  • Past exam of the mathematics course of the University of Cambridge / 2023 / iii / Paper 305 / 1 / e / Solution

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