M. Granath, A. Sabashvili, H.U.R. Strand and S. Östlund Discretized thermal Green's functions Annalen der Physik 524
A spectral weight conserving formalism is presented for Fermionic thermal Green's functions that are discretized in imaginary time τ and thus periodic in imaginary (“Matsubara”) frequency i ωn. The formalism requires a generalization of the Dyson equation and the Baym-Kadanoff-Luttinger-Ward functional for the free energy. A conformal transformation is used to analytically continue the periodized Matsubara Green's function to real frequencies. This allows numerical Green's function calculations of high precision.
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