45 citations · 177 across the 10 of their papers we have counts for
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The Cosmological Constant and Lorentz Invariance of the Vacuum State
Jurjen F. Koksma, Tomislav Prokopec
One hope to solve the cosmological constant problem is to identify a symmetry principle, based on which the cosmological constant can be reduced either to zero, or to a tiny value.…
Dynamics driven by the Trace Anomaly in FLRW Universes
J. F. Koksma
By means of a semiclassical analysis we show that the trace anomaly does not affect the cosmological constant. We calculate the evolution of the Hubble parameter in quasi de Sitter…
Fermion Propagator in Cosmological Spaces with Constant Deceleration
Jurjen F. Koksma, Tomislav Prokopec
We calculate the fermion propagator in FLRW spacetimes with constant deceleration , for excited states. For fermions whose mass is generated by a scalar f…
The Scalar Field Kernel in Cosmological Spaces
Jurjen F. Koksma, Tomislav Prokopec, Gerasimos I. Rigopoulos
We construct the quantum mechanical evolution operator in the Functional Schrodinger picture - the kernel - for a scalar field in spatially homogeneous FLRW spacetimes when the fie…