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On the physical viability of black hole solutions in Einsteinian Cubic Gravity and its generalisations
Jose Beltrán Jiménez, Alejandro Jiménez-Cano
In this note, we discuss the pathological nature of black holes in Einsteinian Cubic gravity and its extensions. We compute the equations for the odd perturbations and show how sph…
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…
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…
Non-trivial gravitational waves and structure formation phenomenology from dark energy
Jose Beltran Jimenez, Lavinia Heisenberg
The detection of the GW170817/GRB170817A event improved the constraints on the propagation speed of gravitational waves, thus placing possible variations caused by dark energy unde…
Teleparallel Palatini theories
Jose Beltran Jimenez, Lavinia Heisenberg, Tomi Koivisto
The Palatini formalism is developed for gravitational theories in flat geometries. We focus on two particularly interesting scenarios. First, we fix the connection to be metric com…