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…
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…
Quark and lepton mixing in the asymptotically safe Standard Model
Astrid Eichhorn, Zois Gyftopoulos, Aaron Held
The quark mixing (CKM) matrix is near-diagonal, whereas the lepton mixing (PMNS) matrix is not. We learn that both observations can generically be explained within an ultraviolet c…
On the Renormalization Group flow of distributions
Astrid Eichhorn, Aaron Held
Renormalization Group flows relate the values of couplings at different scales. Here, we go beyond the Renormalization Group flow of individual trajectories and derive an evolution…
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…
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…