Replacing the Breit-Wigner Amplitude by the Complex Delta Function to Describe Resonances(Frontiers in Nonequilibrium Physics-Fundamental Theory, Glassy & Granular Materials, and Computational Physics-)
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概要
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Whenever the Breit-Wigner amplitude appears in a calculation, there are many instances (e.g., Fermi's two-level system and the Weisskopf-Wigner approximation) where energy integrations are extended from the scattering spectrum of the Hamiltonian to the whole real line. Such extensions are performed in order to obtain a desirable, causal result. In this paper, we recall several of those instances and show that substituting the Breit-Wigner amplitude by the complex delta function allows us to recover such desirable results without having to extend energy integrations outside of the scattering spectrum.
- 2010-07-27
著者
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DE LA
Department of Physics, Lamar University
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De La
Department Of Physics Lamar University
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De La
Departamento De Bioquimica Genetica E Inmunologia Universidad De Vigo
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La Madrid
Department of Physics, Lamar University
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- Replacing the Breit-Wigner Amplitude by the Complex Delta Function to Describe Resonances(Frontiers in Nonequilibrium Physics-Fundamental Theory, Glassy & Granular Materials, and Computational Physics-)
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