66 citations · 103 across the 5 of their papers we have counts for
5 papers
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…
On Rotating Black Holes in DHOST Theories
Jibril Ben Achour, Hongguang Liu, Hayato Motohashi +2
Using the disformal solution-generating method, we construct new axisymmetric solutions in Degenerate Higher Order Scalar Tensor (DHOST) theories. The method consists in first cons…
The Cosmological Constant from Conformal Transformations: Möbius Invariance and Schwarzian Action
Jibril Ben Achour, Etera R. Livine
The homogeneous Friedman-Lema\^ıtre-Robertson-Walker (FLRW) cosmology of a free scalar field with vanishing cosmological constant was recently shown to be invariant under the one-d…
Conformal structure of FLRW Cosmology: Spinorial representation and the so(3,2) algebra of observables
Jibril Ben Achour, Etera R. Livine
It was recently shown that the homogeneous and isotropic cosmology of a massless scalar field coupled to general relativity exhibits a new hidden conformal invariance under Mobius…
Spectra of geometric operators in three-dimensional LQG: From discrete to continuous
Jibril Ben Achour, Marc Geiller, Karim Noui +1
We study and compare the spectra of geometric operators (length and area) in the quantum kinematics of two formulations of three-dimensional Lorentzian loop quantum gravity. In the…