9 citations · 9 across the 7 of their papers we have counts for
7 papers
Perturbations of black holes with primary hair: time evolutions, quasinormal modes and greybody factors
Georgios Antoniou
In this work we study gravitational perturbations of black holes carrying primary scalar hair in shift-symmetric beyond-Horndeski gravity. By focusing on the axial sector, we study…
Parametrized quasinormal modes, greybody factors and their correspondence
Georgios Antoniou
We present a detailed study of quasinormal modes and greybody factors in the context of the parametrized quasinormal mode framework, in which modifications to general relativity ar…
Nonperturbative suppression of beyond-General-Relativity effects in quadratic gravity
Georgios Antoniou, Leonardo Gualtieri, Paolo Pani
Quadratic gravity is a well-motivated extension of general relativity~(GR) wherein the Einstein-Hilbert action is augmented by quadratic curvature terms. This theory is equivalent…
Greybody factors in scalar-tensor gravity and beyond
Georgios Antoniou, Thomas D. Pappas, Panagiota Kanti
In the framework of the beyond Horndeski action, we consider three subtheories that support scalarised black-hole solutions, and look for modified characteristics compared to GR. W…
Probing time-dependent scalar wigs with extreme mass ratio inspirals
Matteo Della Rocca, Georgios Antoniou, Leonardo Gualtieri +1
We investigate the gravitational wave emission from extreme mass ratio inspirals, key targets for the upcoming space-based detector LISA, considering the scenario where the lighter…
Gravitational quasinormal modes of black holes in quadratic gravity
Georgios Antoniou, Leonardo Gualtieri, Paolo Pani
We study the gravitational perturbations of black holes in quadratic gravity, in which the Einstein-Hilbert term is supplemented by quadratic terms in the curvature tensor. In this…
Quasinormal modes of hairy black holes in shift-symmetric theories
Georgios Antoniou
Alternative theories of gravity may be put to the test by making use of gravitational wave observations. Scalar-tensor theories provide a relatively simple framework that allows fo…