Hierarchy of double-time correlations
Abstract
The hierarchy of correlations is an analytical approximation method which allows us to study non-equilibrium phenomena in strongly interacting quantum many-body systems on lattices in higher dimensions. So far, this method was restricted to equal-time correlators Aμ(t) B(t). In this work, we generalize this method to double-time correlators Aμ(t) B(t'), which allows us to study effective light cones and Green functions and to incorporate finite initial temperatures.
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