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Matsubara frequency

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Matsubara frequency is a concept commonly used in condensed matter physics and statistical mechanics, specifically in the context of finite-temperature field theory and many-body quantum systems. It arises in the formalism known as Matsubara techniques, which are used to evaluate correlations and Green's functions in systems at finite temperature. Matsubara frequencies are defined as discrete frequencies that appear in the solution of the equations describing quantum systems at finite temperature.

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