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17 papers · 2 filters
Collisions near Kerr black holes: lower limit of energy between orbiting and incoming particles
Mieszko Rutkowski
In our paper we investigate the lower limit of collisional energy of test particles near the Kerr black hole. In particular we examine the minimal Lorentz factor between the freely…
Example of an inhomogeneous cosmological model in the context of backreaction
Szymon Sikora, Krzysztof Głód
In this article, we present an example of an inhomogeneous cosmological model, which is inspired by the linear perturbation theory. The metric of this model can be described as the…
The bizarre anti-de Sitter spacetime
Leszek M. Sokolowski
Anti--de Sitter spacetime is important in general relativity and modern field theory. We review its geometrical features and properties of light signals and free particles moving i…
Characterization of Null Geodesics on Kerr Spacetimes
Claudio F. Paganini, Blazej Ruba, Marius A. Oancea
We consider null geodesics in the exterior region of a subextremal Kerr spacetime. We show that most well-known fundamental properties of null geodesics can be represented on one p…
Slow-roll approximation in loop quantum cosmology
Joanna Luc, Jakub Mielczarek
The slow-roll approximation is an analytical approach to study dynamical properties of the inflationary universe. In this article, systematic construction of the slow-roll expansio…
Observer's observables. Residual diffeomorphisms
Paweł Duch, Jerzy Lewandowski, Jedrzej Świeżewski
We investigate the fate of diffeomorphisms when the radial gauge is imposed in canonical general relativity. As shown elsewhere, the radial gauge is closely related to the observer…