Crucially, we managed to compute the full three-dimensional real-frequency dependence of the four-point vertex of the single-impurity Anderson model, using the functional renormalization group and, independently, the self-consistent parquet equations.

3/3

In it, we tackle the challenge of computing dynamical correlation functions. Using the Keldysh formalism, we obtain their real-frequency dependence directly, without the need for analytic continuation.

2/3