Källén–Lehmann spectral representation
The Källén–Lehmann spectral representation gives a general expression for the (time ordered) two-point function of an interacting quantum field theory as a sum of free propagators. It was discovered by Gunnar Källén and Harry Lehmann independently. This can be written as, using the mostly-minus metric signature, where is the spectral density function that should be positive definite. In a gauge theory, this latter condition cannot be granted but nevertheless a spectral representation can be provided. This belongs to non-perturbative techniques of quantum field theory.
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Källén–Lehmann spectral representation
The Källén–Lehmann spectral representation gives a general expression for the (time ordered) two-point function of an interacting quantum field theory as a sum of free propagators. It was discovered by Gunnar Källén and Harry Lehmann independently. This can be written as, using the mostly-minus metric signature, where is the spectral density function that should be positive definite. In a gauge theory, this latter condition cannot be granted but nevertheless a spectral representation can be provided. This belongs to non-perturbative techniques of quantum field theory.
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Die Källén-Lehmann-Darstellung ...... als Propagator im Impulsraum.
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La rappresentazione spettrale ...... un approccio non perturbativo.
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Na teoria quântica de campos, ...... da teoria quântica de campos.
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The Källén–Lehmann spectral re ...... iques of quantum field theory.
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レーマン表示（英: Lehmann representation）とは、場の理論における2点グリーン関数(1粒子グリーン関数)のスペクトル表示のことを指す。
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Die Källén-Lehmann-Darstellung ...... als Propagator im Impulsraum.
@de
La rappresentazione spettrale ...... gente può essere scritto come:
@it
Na teoria quântica de campos, ...... da teoria quântica de campos.
@pt
The Källén–Lehmann spectral re ...... iques of quantum field theory.
@en
レーマン表示（英: Lehmann representation）とは、場の理論における2点グリーン関数(1粒子グリーン関数)のスペクトル表示のことを指す。
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label
Källén-Lehmann-Darstellung
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Källén–Lehmann spectral representation
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Rappresentazione spettrale di Källén-Lehmann
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Representação espectral de Källén-Lehmann
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レーマン表示
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켈렌-레만 스펙트럼 표현
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