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4 papers · 2 filters
Dynamical axisymmetric compact objects in General Relativity
Jibril Ben Achour, Adolfo Cisterna, Mokhtar Hassaine
The search for exact solutions describing asymptotically FLRW compact objects in General Relativity remains a challenging problem. Progress has largely been limited to the spherica…
Twisting asymptotically-flat spacetimes
Marc Geiller, Pujian Mao, Antoine Vincenti
We extend the Bondi formalism to describe asymptotically-flat spacetimes where the outgoing null geodesic congruence is not hypersurface-orthogonal, i.e. has non-vanishing twist. I…
Algebraically special perturbations of the Kerr black hole: a metric formulation
Jibril Ben Achour, Clara Montagnon, Hugo Roussille
Perturbations of the Kerr black hole are notoriously difficult to describe in the metric formalism and are usually studied in terms of perturbations of the Weyl scalars. In this wo…
Black hole photon ring beyond General Relativity: an integrable parametrization
Jibril Ben Achour, Eric Gourgoulhon, Hugo Roussille
In recent years, the shape of the photon ring in black holes images has been argued to provide a sharp test of the Kerr hypothesis for future black hole imaging missions. In this w…