60 citations · 91 across the 11 of their papers we have counts for
9 papers · 1 filter
Emergence of Horndeski gravity from asymptotic safety?
Astrid Eichhorn, Pedro G. S. Fernandes, Fabian Willaschek
There are strong motivations to modify gravity in the ultraviolet as well as the infrared. Such modifications are usually pursued independently from one another. Using the predicti…
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…
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…
Towards a Non-singular Paradigm of Black Hole Physics
Raúl Carballo-Rubio, Francesco Di Filippo, Stefano Liberati +18
The study of regular black holes and black hole mimickers as alternatives to standard black holes has recently gained significant attention, driven both by the need to extend gener…
Black Holes Inside and Out 2024: visions for the future of black hole physics
Niayesh Afshordi, Abhay Ashtekar, Enrico Barausse +27
The gravitational physics landscape is evolving rapidly, driven by our ability to study strong-field regions, in particular black holes. Black Holes Inside and Out gathered world e…
Black hole horizons must be veiled by photon spheres
Raúl Carballo-Rubio, Astrid Eichhorn
Horizons and bound photon orbits are defining features of black holes that translate into key features of black hole images. We present a purely geometric proof that spherically sy…
Shadows and Properties of Spin-Induced Scalarized Black Holes with and without a Ricci Coupling
Pedro G. S. Fernandes, Clare Burrage, Astrid Eichhorn +1
In this work, we explore the properties and shadows of spin-induced scalarized black holes, as well as investigate how a Ricci coupling influences them. Our findings reveal signifi…
Breaking black-hole uniqueness at supermassive scales
Astrid Eichhorn, Pedro G. S. Fernandes, Aaron Held +1
In general relativity, all vacuum black holes are described by the Kerr solution. Beyond general relativity, there is a prevailing expectation that deviations from the Kerr solutio…
Disentangling photon rings beyond General Relativity with future radio-telescope arrays
Raúl Carballo-Rubio, Héloïse Delaporte, Astrid Eichhorn +1
New physics beyond General Relativity can modify image features of black holes and horizonless spacetimes and increase the separation between photon rings. This motivates us to exp…