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559 papers · 1 filter
Spinning black holes in astrophysical environments
Pedro G. S. Fernandes, Vitor Cardoso
We present stationary and axially-symmetric black hole solutions to the Einstein field equations sourced by an anisotropic fluid, describing rotating black holes embedded in astrop…
Pseudospectral implementation of the Einstein-Maxwell system
Jorge Expósito Patiño, Hannes R. Rüter, David Hilditch
Electromagnetism plays an important role in a variety of applications in gravity that we wish to investigate. To that end, in this work, we present an implementation of the Maxwell…
Tidal Love numbers of gravitational atoms
Ricardo Arana, Richard Brito, Gonçalo Castro
Ultralight bosonic fields can form condensates, or clouds, around spinning black holes. When this system is under the influence of a secondary massive body, its tidal response can…
Physical States and Transition Amplitudes in Piecewise Flat Quantum Gravity
Aleksandar Mikovic
We show how the path integral for gravity and matter on a piecewise flat spacetime can be used to define the physical quantum gravity states and the related transition amplitudes.…
Superradiant Instability of Magnetic Black Holes
David Pereñiguez, Marina de Amicis, Richard Brito +1
Black hole superradiance has proven being very valuable in several realms of gravitational physics, and holds a promising discovery potential. In this paper, we consider the superr…
Comment on "The Tully-Fisher law and dark matter effects derived via modified symmetries" by Arraut Ivan
L. Filipe O. Costa, F. Frutos-Alfaro, José Natário +1
It has been claimed in I. Arraut, 2023 EPL 144 29003 [arXiv:2311.05652] that General Relativity can generate effects equivalent to dark matter, based on a "new modified symmetry th…