282 citations · 4k across the 98 of their papers we have counts for
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Classical and quantum LTB model for the non-marginal case
Claus Kiefer, Jakob Mueller-Hill, Cenalo Vaz
We extend the classical and quantum treatment of the Lemaitre-Tolman-Bondi (LTB) model to the non-marginal case (defined by the fact that the shells of the dust cloud start with a…
Quantum Gravity: General Introduction and Recent Developments
Claus Kiefer
I briefly review the current status of quantum gravity. After giving some general motivations for the need of such a theory, I discuss the main approaches in quantizing general rel…
Semiclassical approximation to supersymmetric quantum gravity
Claus Kiefer, Tobias Lueck, Paulo Moniz
We develop a semiclassical approximation scheme for the constraint equations of supersymmetric canonical quantum gravity. This is achieved by a Born-Oppenheimer type of expansion,…
Quantum Cosmology and the Arrow of Time
Claus Kiefer
Although most fundamental laws are invariant under time reversal, experience exhibits the presence of irreversible phenomena -- the arrows of time. Their origin lies in cosmology,…