A new discrete causal representation of the self-energy is obtained by discretizing Kugler's symmetric estimator for use in impurity models and DMFT.
L¨ owdin, A Note on the Quantum-Mechanical Perturbation Theory, The Journal of Chemical Physics 19, 1396 (1951)
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Symmetric estimator for discrete self-energy of discrete many-body systems
A new discrete causal representation of the self-energy is obtained by discretizing Kugler's symmetric estimator for use in impurity models and DMFT.