11 citations · 26 across the 8 of their papers we have counts for
4 papers · 1 filter
Again About Singularity Crossing In Gravitation And Cosmology
Alexander Kamenshchik
We discuss the problem of singularity crossing in isotropic and anisotropic universes. We study at which conditions singularities can disappear in quantum cosmology and how quantum…
Cosmology from Schwarzschild black hole revisited
Roberto Casadio, Alexander Kamenshchik, Jorge Ovalle
We study cosmological models based on the interior of the revisited Schwarzschild black hole recently reported in [Phys.~Rev.~D{\bf 109} (2024) 104032]. We find that these solution…
Relaxation of first-class constraints and the quantization of gauge theories: from "matter without matter" to the reappearance of time in quantum gravity
Roberto Casadio, Leonardo Chataignier, Alexander Yu. Kamenshchik +3
We make a conceptual overview of a particular approach to the initial-value problem in canonical gauge theories. We stress how the first-class phase-space constraints may be relaxe…
From black hole mimickers to black holes
Roberto Casadio, Alexander Kamenshchik, Jorge Ovalle
We present a simple analytical model for studying the collapse of an ultracompact stellar object (regular black hole mimicker with infinite redshift surface) to form a (integrable)…