From the 1 of 6 linked papers with an AI index.
6 papers
A parity selection rule for regular black holes
Farid Thaalba, Julio Arrechea, Stefano Liberati
Regular black hole metrics are usually studied kinematically, but a finite-curvature static core does not guarantee that the underlying theory can consistently evolve generic matte…
Higher-derivative gravitational effective field theories are generically weakly hyperbolic
Farid Thaalba, Fernando Abalos, Miguel Bezares
The paper studies the initial‑value problem for metric higher‑derivative gravitational effective field theories and demonstrates that any such theory with characteristic speeds ind…
A well-posed BSSN-type formulation for scalar-tensor theories of gravity with second-order field equations
Harry L. H. Shum, Llibert Aresté Saló, Farid Thaalba +2
Recent developments in the modified harmonic and modified puncture gauges have opened new possibilities for performing stable numerical evolutions beyond General Relativity. In thi…
Screening of dipolar emission in two-scale Gauss-Bonnet gravity
Farid Thaalba, Leonardo Gualtieri, Thomas P. Sotiriou +1
We study black holes in shift-symmetric scalar Gauss-Bonnet gravity extended by a cubic Galileon interaction with a distinct energy scale. Introducing this hierarchy profoundly mod…
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…
Hyperbolicity in scalar-Gauss-Bonnet gravity: a gauge invariant study for spherical evolution
Farid Thaalba, Nicola Franchini, Miguel Bezares +1
We study spherical evolution in scalar-Gauss-Bonnet gravity with additional Ricci coupling and use the gauge-invariant approach of Ref.~\cite{Reall:2021voz} to track well-posedness…