33 citations · 150 across the 12 of their papers we have counts for
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hep-th2022★ 4 cited
Vacuum energy, the Casimir effect, and Newton's non-constant
Benjamin Koch, Christian Käding, Mario Pitschmann +1
We explore two hypotheses. First, the possibility that the quantum vacuum energy density of the Casimir effect contributes to a (local) gravitational vacuum energy density. Second,…
hep-th2022★ 11 cited
Density matrix formalism for interacting quantum fields
Christian Käding, Mario Pitschmann
We provide a description of interacting quantum fields in terms of density matrices for any occupation numbers in Fock space in a momentum basis. As a simple example, we focus on a…
hep-th2022★ 20 cited
A new method for directly computing reduced density matrices
Christian Käding, Mario Pitschmann
We demonstrate the power of a first principle-based and practicable method that allows for the perturbative computation of reduced density matrix elements of an open quantum system…