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TT: Fachverband Tiefe Temperaturen

TT 86: Correlated Electrons: Method Development

TT 86.2: Talk

Friday, March 22, 2024, 09:45–10:00, H 3007

Compressed Models of Exact Many-Body Propagators — •Markus Wallerberger — TU Wien, Austria

Many-body propagators take centre stage in a multitude of theories and experiments of strongly correlated systems. Computing these propagators for small systems, one usually turns to the numerically exact Lanczos method or related configuration interaction techniques. However, the multi-point propagator is still challenging to compute efficiently.

In this contribution, we will show how to use the recently developed intermediate representation and sparse modelling, machine-learning inspired models for the many-body propagator, to significantly speed up and numerically stabilize the computation of these propagators.

Keywords: Lanczos; Sparse modelling; Many-body propagator