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Dynamic correlations

Tobias Müller requested to merge dynamic_correlations into main

Created by: dominikkiese

Mayor changes:

  • correlations are now computed on the whole Matsubara axis. The corresponding mesh is likewise adjusted during the flow.
  • s and u channel live on the same mesh now, to ensure precise fulfillment of symmetries.
  • the integration of the SDE is now optimized and allows fast parquet iterations.
  • the integration routine for the correlations was upgraded to a two-dimensional Genz-Malik rule using the Cubature package. To cope with the infinite bounds, a transformation of integration variables is performed. Similarly, to respect the progressive sharpening of propagators with decreasing cutoffs, the integration domain is separated into rectangular boxes, where the central box has a width proportional to the region where the propagators have a vivid structure.

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