6 papers
Regular black holes without mass-inflation instability and gravastars from modified gravity
Astrid Eichhorn, Pedro G. S. Fernandes
We derive regular black-hole solutions, including the Hayward metric, from four-dimensional action principles involving vector fields in addition to the metric. These black holes p…
Strong breaking of black-hole uniqueness from coexisting scalarization mechanisms
Astrid Eichhorn, Pedro G. S. Fernandes, Lidia Marino
Black-hole uniqueness, i.e., the statement that all stationary vacuum black holes in the universe are described by the Kerr solution, is expected to break in theories beyond Genera…
Non-minimal light-curvature couplings and black-hole imaging
Raúl Carballo-Rubio, Héloïse Delaporte, Astrid Eichhorn +1
Non-minimal couplings between the electromagnetic field strength and the spacetime curvature are part of the effective field theory of gravity and matter. They alter the local prop…
Supermassive black hole scalarization and effective field theory
Farid Thaalba, Pedro G. S. Fernandes, Thomas P. Sotiriou
A model in which black hole scalarization occurs for supermassive black holes, while their less massive counterparts remain unscalarized, has been recently proposed. We explore whe…
Rotating scalarized black holes: the role of the coupling
Kalin V. Staykov, Daniela D. Doneva, Pedro G. S. Fernandes +1
We perform an in-depth analysis of rotating scalarized black holes in scalar-Gauss-Bonnet gravity, where scalarization is induced by the spacetime curvature. Our results show that…
Purely metric Horndeski theories and spontaneous curvaturization of black holes
Astrid Eichhorn, Pedro G. S. Fernandes
We explore purely metric theories of gravity with second-order equations of motion and a single additional, purely gravitational, propagating, scalar degree of freedom. We identify…