12 papers
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…
Rotating black holes with primary hair in five-dimensional generalized Proca theory
Mokhtar Hassaine, Ulises Hernandez-Vera
This work presents a new class of exact analytic rotating black hole solutions within five-dimensional generalized Proca theories. Through a Kerr-Schild ansatz where the Proca fiel…
An effective cosmological constant as black hole primary hair
Christos Charmousis, Pedro G. S. Fernandes, Mokhtar Hassaine
We study Generalized Proca theories inspired by the recent regularised Proca theory of four-dimensional Gauss-Bonnet gravity. By abandoning the rigid constraints typically imposed…
A new exact rotating spacetime in vacuum: The Kerr--Levi-Civita Spacetime
José Barrientos, Adolfo Cisterna, Mokhtar Hassaine +2
We construct a new rotating solution of Einstein's theory in vacuum by exploiting the Lie point symmetries of the field equations in the complex potential formalism of Ernst. In pa…
Ultrarelativistic limit of the Kerr theorem
Eloy Ayón-Beato, Daniel Flores-Alfonso, Mokhtar Hassaine
The original Kerr theorem provides the foundation for Kerr-Schild transformations by classifying all shear-free and geodesic null congruences in flat spacetime; the key ingredient…
Rotating spacetimes with a free scalar field in four and five dimensions
José Barrientos, Christos Charmousis, Adolfo Cisterna +1
We construct explicit rotating solutions in Einstein's theory of relativity with a minimally coupled free scalar field rederiving and finding solutions in four or five spacetime di…