106 citations · 267 across the 14 of their papers we have counts for
5 papers · 1 filter
Gravitational electric-magnetic duality at the light ring and quasinormal mode isospectrality in effective field theories
Ibrahima Bah, Emanuele Berti, Valerio De Luca +2
Black hole perturbations are characterized by a superposition of damped exponentials known as quasinormal modes. In general relativity, the spectra of parity-even and parity-odd qu…
Gravitational Atoms from Topological Stars
Ibrahima Bah, Emanuele Berti, Bogdan Ganchev +2
We study the bound states of a massive scalar field around a topological star, and show that these are strictly normal modes. This yields a genuine gravitational atom, sharply dist…
Black Hole Multipoles in Higher-Derivative Gravity
Pablo A. Cano, Bogdan Ganchev, Daniel R. Mayerson +1
We consider a broad family of higher-derivative extensions of four-dimensional Einstein gravity and study the multipole moments of rotating black holes therein. We carefully show t…
Plausible scenario for a generic violation of the weak cosmic censorship conjecture in asymptotically flat four dimensions
Felicity C. Eperon, Bogdan Ganchev, Jorge E. Santos
We present a plausible counterexample to the weak cosmic censorship conjecture in the four-dimensional Einstein-Scalar theory with asymptotically flat boundary conditions. Our setu…
Scalar Hairy Black Holes in Four Dimensions are Unstable
Bogdan Ganchev, Jorge E. Santos
We present a numerical analysis of the stability properties of the black holes with scalar hair constructed by Herdeiro and Radu. We prove the existence of a novel gauge where the…