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        "quote": "自由度此时可数，但仍有无限多个。再施加“[<u class=\"concept-term\" data-concept-reference=\"concepts/quantum-field-theory/ultraviolet-cutoff\" data-concept-identity=\"urn:uuid:86b49294-3197-40c3-94d8-1af3e1c723bc\" data-concept-route=\"/concept-identities#concept-86b49294-3197-40c3-94d8-1af3e1c723bc\" id=\"first-081dacab86af793b9dd3-zh\">紫外截断(ultraviolet cutoff)</u>](../../../../../concepts/quantum-field-theory/ultraviolet-cutoff)”，将动量限制为 $|p|\\le\\Lambda$，其中 $\\Lambda$ 有限，等价地将指标限制为 $|j|<\\Lambda L/(2\\pi)$。这样解空间成为有限维，便可用Bargmann–Fock方法量子化，最后再取 $\\Lambda\\to\\infty$、$L\\to\\infty$。",
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