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30 papers · 2 filters
Superradiant instabilities in astrophysical systems
Helvi Witek, Vitor Cardoso, Akihiro Ishibashi +1
Light bosonic degrees of freedom have become a serious candidate for dark matter. The evolution of these fields around curved spacetimes is poorly understood but is expected to dis…
Revisiting the spectrum of a scalar field in an anisotropic universe
Hyeong-Chan Kim, Masato Minamitsuji
We revisit the issue on signatures of pre-inflationary background anisotropy by considering the quantization of a massless and minimally coupled scalar field in an axially symmetri…
Quasinormal modes of regular black holes
Antonino Flachi, José P. S. Lemos
Black hole quasinormal frequencies are complex numbers that encode information on how a black hole relaxes after it has been perturbed and depend on the features of the geometry an…
Universality, maximum radiation and absorption in high-energy collisions of black holes with spin
Ulrich Sperhake, Emanuele Berti, Vitor Cardoso +1
We explore the impact of black hole spins on the dynamics of high-energy black hole collisions. We report results from numerical simulations with gamma-factors up to 2.49 and dimen…
Probing the Flyby Anomaly with the future STE-QUEST mission
Jorge Páramos, Gerald Hechenblaikner
In this study, we demonstrate that the flyby anomaly, an unexpected acceleration detected in some of the gravitational assists of the Galileo, NEAR, Cassini and Rosetta spacecraft,…
Perturbations of slowly rotating black holes: massive vector fields in the Kerr metric
Paolo Pani, Vitor Cardoso, Leonardo Gualtieri +2
We discuss a general method to study linear perturbations of slowly rotating black holes which is valid for any perturbation field, and particularly advantageous when the field equ…