PhD Defense of Gary Schmiedinghoff
systems. Furthermore, flow equation approaches often struggle in the vicinity of critical points. This thesis aims to cover three separate problems regarding flow equations: Spin ladders are crucial models for [...] scattering, but the theoretical prediction of the corresponding spectral densities is intricate. In this thesis, we compute the spectral densities of a spin-1/2 Heisenberg ladder with the flow equation method …
