A new discrete causal representation of the self-energy is obtained by discretizing Kugler's symmetric estimator for use in impurity models and DMFT.
Here, we describe an alternative approach that obtains the pole expansion of Σ(z) directly from the pole expansion of ˜G(z) using standard linear algebra techniques
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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.