161 citations · 1.2k across the 28 of their papers we have counts for
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gr-qc2018
Space and Time 62 Years after the Berne Conference
Claus Kiefer
In 1955, an international conference took place in Berne at which the state of relativity theory and its possible generalizations were presented and critically discussed. I review…
gr-qc2018
On the dynamics of the general Bianchi IX spacetime near the singularity
Claus Kiefer, Nick Kwidzinski, Włodzimierz Piechocki
We show that the complex dynamics of the general Bianchi IX universe in the vicinity of the spacelike singularity can be approximated by a simplified system of equations. Our analy…
gr-qc2018
Semiclassical approximation of the Wheeler-DeWitt equation: arbitrary orders and the question of unitarity
Claus Kiefer, David Wichmann
We extend the Born-Oppenheimer type of approximation scheme for the Wheeler-DeWitt equation of canonical quantum gravity to arbitrary orders in the inverse Planck mass squared. We…