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On the strong coupling of Einsteinian Cubic Gravity and its generalisations
Jose Beltrán Jiménez, Alejandro Jiménez-Cano
In this note we discuss the strong coupling issues inherent to the defining requirement for the so-called Einsteinian Cubic Gravity and its quasi-topological generalisations.
Instabilities in Metric-Affine Theories of Gravity
Jose Beltrán Jiménez, Adrià Delhom
We discuss the presence of ghostly instabilities for metric-affine theories constructed with higher order curvature terms. We mainly focus on theories containing only the Ricci ten…
The coupling of matter and spacetime geometry
Jose Beltran Jimenez, Lavinia Heisenberg, Tomi Koivisto
The geometrical formulation of gravity is not unique and can be set up in a variety of spacetimes. Even though the gravitational sector enjoys this freedom of different geometrical…
Charged Black Hole Mergers: Orbit Circularisation and Chirp Mass Bias
Øyvind Christiansen, Jose Beltrán Jiménez, David F. Mota
We consider the inspiral of black holes carrying U(1) charge that is not electromagnetic, but corresponds to some dark sector. In the weak-field, low-velocity regime, the component…