282 citations · 4k across the 98 of their papers we have counts for
102 papers
Observations in Quantum Cosmology
Leonardo Chataignier, Claus Kiefer, Paulo Moniz
In this review, we focus on whether a canonical quantization of general relativity can produce testable predictions for cosmology. In particular, we examine how this approach can b…
Gödel's undecidability theorems and the search for a theory of everything
Claus Kiefer
I investigate the question whether Gödel's undecidability theorems play a crucial role in the search for a unified theory of physics. I conclude that unless the structure of space-…
From classical to quantum Oppenheimer-Snyder model: non-marginal case
Claus Kiefer, Hamid Mohaddes
We first present a consistent canonical formulation of the general (non-marginal) Oppenheimer-Snyder model. The switching between comoving and stationary observer is achieved by pr…
Quantum gravity -- an unfinished revolution
Claus Kiefer
It is generally assumed that the search for a consistent and testable theory of quantum gravity is among the most important open problems of fundamental physics. I review the motiv…
Quantum-gravitational corrections to the power spectrum for a closed universe
Tatevik Vardanyan, Claus Kiefer
We study the quantum-gravitational corrections to the power spectrum of a gauge-invariant inflationary scalar perturbations in a closed model of a universe. We consider canonical q…
Symmetric wormholes in Einstein-vector-Gauss-Bonnet theory
Simon Barton, Claus Kiefer, Burkhard Kleihaus +1
We construct wormholes in Einstein-vector-Gauss-Bonnet theory where a real massless vector field is coupled to the higher curvature Gauss-Bonnet invariant. We consider three coupli…