44.3 For further reading
The operators corresponding to various symmetries of scalar quantum fields described in this chapter are discussed in many quantum field theory books, with a typical example chapter 4 of [35]. In these books the form of the operators is typically derived from an invariance of the Lagrangian via Noether’s theorem rather than by the Hamiltonian moment map methods used here.
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正文：英文 · OCR 机器稿 · 待校对
核对状态：OCR 机器稿 · 待校对
原书 PDF · 印刷页 473、474、475、476、477、478、479、480、481、482、483
来源版本：2025-10-20
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