66 citations · 180 across the 20 of their papers we have counts for
20 papers
Black holes in alternative theories of gravity
Jose Luis Blázquez-Salcedo, Fech Scen Khoo, Burkhard Kleihaus +1
Black holes, with their strong gravitational fields, provide an important testing ground for theories of gravity beyond General Relativity. Among the many proposed alternatives, co…
Static multipolar Einstein-vector-Gauss-Bonnet black holes
Burkhard Kleihaus, Jutta Kunz
We construct and analyze static multipolar black holes in Einstein-vector-Gauss-Bonnet theory with a quadratic coupling function. The vectorized solutions bifurcate from the Schwar…
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…
An Exact Single-Rotating Near-Horizon Geometry in Einstein-Gauss-Bonnet Gravity
U. Can Çelik, Kamal Hajian, Jutta Kunz
We construct a five-dimensional singly rotating near-horizon solution in Einstein-Gauss-Bonnet gravity. We show that the Gauss-Bonnet term removes the local curvature singularity,…
Spin-Induced Nonlinear Scalarization of Kerr Black Holes in Einstein-scalar-Gauss-Bonnet Gravity
Meng-Yun Lai, Hyat Huang, Jutta Kunz +2
We investigate spin-induced scalarization of Kerr black holes in an Einstein-scalar-Gauss-Bonnet (EsGB) model that does not admit a linear tachyonic instability of the scalar-free…
Stationary Einstein-vector-Gauss-Bonnet black holes
Burkhard Kleihaus, Jutta Kunz
We study spontaneously vectorized black holes in Einstein-vector-Gauss-Bonnet theory with a quadratic coupling function. Besides the static, spherically symmetric black holes carry…
Dyonic Einstein-Maxwell-scalar black holes: the cold, the hot and the plunge
Shun Chen, Xiao Yan Chew, Jutta Kunz
We investigate dyonic nonlinearly scalarized black holes in Einstein-Maxwell-scalar theory. The domain of existence of scalarized dyonic black holes consists of three branches. The…
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…
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…
Quasinormal mode spectrum of rotating black holes in Einstein-Gauss-Bonnet-dilaton theory
Jose Luis Blázquez-Salcedo, Fech Scen Khoo, Burkhard Kleihaus +1
Quasinormal modes are excited during the ringdown phase of black holes after merger. Determination of quasinormal modes of rapidly rotating black holes in alternative theories of g…
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…
Quasinormal modes of rapidly rotating Einstein-Gauss-Bonnet-dilaton black holes
Jose Luis Blázquez-Salcedo, Fech Scen Khoo, Burkhard Kleihaus +1
Quasinormal modes of rapidly rotating black holes are crucial in understanding the ringdown phase after a merger. While for Kerr black holes these modes have been known for a long…
Radial perturbations of Ellis-Bronnikov wormholes in slow rotation up to second order
Bahareh Azad, Jose Luis Blázquez-Salcedo, Fech Scen Khoo +1
We consider slowly rotating Ellis-Bronnikov wormholes and investigate their radial perturbations (), expanding up to second order in rotation. We present the detailed…
Quasinormal modes of rapidly rotating Ellis-Bronnikov wormholes
Fech Scen Khoo, Bahareh Azad, Jose Luis Blázquez-Salcedo +4
We present for the first time a study of the quasinormal modes of rapidly rotating Ellis-Bronnikov wormholes in General Relativity. We compute the spectrum of the wormholes using a…
Quasinormal modes of Kerr black holes using a spectral decomposition of the metric perturbations
Jose Luis Blázquez-Salcedo, Fech Scen Khoo, Jutta Kunz +1
We report a new method to calculate the quasinormal modes of rotating black holes, using a spectral decomposition to solve the partial differential equations that result from intro…
Universal relations for quasinormal modes of neutron stars in gravity
J. L. Blázquez-Salcedo, L. M. González-Romero, F. S. Khoo +2
We construct quasinormal modes for neutron stars in gravity in the Einstein frame, considering scalar masses in the sub-neV range. In particular, we investigate the fundament…
Rotating Einstein-Yang-Mills Black Holes
B. Kleihaus, J. Kunz, F. Navarro-Lerida
We construct rotating hairy black holes in SU(2) Einstein-Yang-Mills theory. These stationary axially symmetric black holes are asymptotically flat. They possess non-trivial non-Ab…
Static Axially Symmetric Einstein-Yang-Mills-dilaton solutions: Addendum Asymptotic solutions
B. Kleihaus, Jutta Kunz
We discuss the asymptotic form of the static axially symmetric, globally regular and black hole solutions, obtained recently in Einstein-Yang-Mills and Einstein-Yang-Mills-dilaton…
Black Holes with Yang-Mills Hair
B. Kleihaus, J. Kunz, A. Sood +1
In Einstein-Maxwell theory black holes are uniquely determined by their mass, their charge and their angular momentum. This is no longer true in Einstein-Yang-Mills theory. We disc…