ABSTRACT
So far we have studied many-body systems by considering the effect of adding or removing one or more particles. From the one particle Green’s function G ( 1 - 1 ′ ) , $ G(1 - 1'), $ https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315196596/a397f31e-8107-49bb-8694-b978d38168d6/content/inline-math7_1.tif"/> we were able to determine the energy spectrum and decay times of the single-particle excited states.
