8 papers
Nonradial perturbations of static charged wormholes
Jose Luis Blázquez-Salcedo, Luis Manuel González-Romero, Fech Scen Khoo +2
We investigate the nonradial quasinormal-mode spectrum of static charged Ellis--Bronnikov wormholes in Einstein--Maxwell theory minimally coupled to a phantom scalar field. The bac…
Hierarchy of Angular Instabilities in Scalarized Black Holes
Jose Luis Blázquez-Salcedo, Luis Manuel González-Romero, Fech Scen Khoo +2
We investigate the stability of scalarized black holes in Einstein-scalar-Gauss-Bonnet-Ricci theory along their fundamental branches. We show that initially stable solutions first…
Radial perturbations of charged wormholes
Jose Luis Blázquez-Salcedo, Luis Manuel González-Romero, Fech Scen Khoo +2
Ellis-Bronnikov wormholes suffer from an unstable radial mode. Here we investigate the evolution of the unstable mode(s) for charged wormholes. We show that the instability remains…
Quasinormal modes of rotating black holes in shift-symmetric Einstein-scalar-Gauss-Bonnet theory
Fech Scen Khoo, Jose Luis Blázquez-Salcedo, Burkhard Kleihaus +1
We employ a recently developed spectral method to obtain the spectrum of quasinormal modes of rapidly rotating black holes in alternative theories of gravity and apply it to the bl…
Quadrupole perturbations of slowly spinning Ellis-Bronnikov wormholes
Bahareh Azad, Jose Luis Blázquez-Salcedo, Fech Scen Khoo +2
We study the axial and polar perturbations of slowly rotating Ellis-Bronnikov wormholes in General Relativity, applying a perturbative double expansion. In particular, we derive th…
Scalar Quasinormal Modes of Rotating Regular Black Holes
Fech Scen Khoo
Quasinormal modes are characteristic signatures of compact objects. Here we consider rotating regular black holes, representing rotating generalizations of the Simpson and Visser m…