Universität zu Köln

2019

Bouhmadi-López, Mariam, Kiefer, Claus ORCID: 0000-0001-6163-9519 and Martín-Moruno, Prado ORCID: 0000-0001-8073-4896 (2019). Phantom singularities and their quantum fate: general relativity and beyond—a CANTATA COST action topic. General Relativity and Gravitation, 51 (10). Springer. ISSN 0001-7701

Brizuela, David, Kiefer, Claus, Krämer, Manuel and Robles-Pérez, Salvador (2019). Quantum-gravity effects for excited states of inflationary perturbations. Physical Review D, 99 (10). APS. ISSN 2470-0010

Kiefer, Claus and Kwidzinski, Nick (2019). Singularity avoidance in anisotropic quantum cosmology. Journal of Physics: Conference Series, 1275. 012011. IOP. ISSN 1742-6588

Kiefer, Claus, Kwidzinski, Nick and Piontek, Dennis (2019). Singularity avoidance in Bianchi I quantum cosmology. The European Physical Journal C, 79 (8). Springer. ISSN 1434-6044

Kiefer, Claus and Schmitz, Tim (2019). Singularity avoidance for collapsing quantum dust in the Lemaître-Tolman-Bondi model. Physical Review D, 99 (12). ISSN 2470-0010

2018

Hehl, Friedrich W. and Kiefer, Claus (2018). Comparison of the DeWitt metric in general relativity with the fourth-rank constitutive tensors in electrodynamics and in elasticity theory. General Relativity and Gravitation, 50 (1). Springer. ISSN 0001-7701

Kiefer, Claus, Kwidzinski, Nick and Piechocki, Włodzimierz (2018). On the dynamics of the general Bianchi IX spacetime near the singularity. The European Physical Journal C, 78 (9). Springer. ISSN 1434-6044

Kiefer, Claus ORCID: 0000-0001-6163-9519 and Wichmann, David (2018). Semiclassical approximation of the Wheeler–DeWitt equation: arbitrary orders and the question of unitarity. General Relativity and Gravitation, 50 (6). Springer. ISSN 0001-7701

2017

Eckart, Andreas, Hüttemann, Andreas, Kiefer, Claus, Britzen, Silke, Zajaček, Michal, Lämmerzahl, Claus, Stöckler, Manfred, Valencia-S, Monica, Karas, Vladimir and García-Marín, Macarena (2017). The Milky Way’s Supermassive Black Hole: How Good a Case Is It? Foundations of Physics, 47 (5). pp. 553-624. Springer. ISSN 0015-9018

Eingorn, Maxim, Kiefer, Claus and Zhuk, Alexander (2017). Cosmic screening of the gravitational interaction. International Journal of Modern Physics D, 26 (12). p. 1743012. World Scientific. ISSN 0218-2718

Kiefer, Claus and Nikolić, Branislav (2017). Conformal and Weyl-Einstein gravity: Classical geometrodynamics. Physical Review D, 95 (8). 084018. APS. ISSN 2470-0010

Kiefer, Claus and Nikolić, Branislav (2017). Quantum geometrodynamics of Einstein and conformal (Weyl-squared) gravity. Journal of Physics: Conference Series, 880. 012002. IOP. ISSN 1742-6588

Menezes, Gabriel, Kiefer, Claus and Marino, Jamir (2017). Thermal and nonthermal scaling of the Casimir-Polder interaction in a black hole spacetime. Physical Review D, 95 (8). 085014. APS. ISSN 2470-0010