Karim Mosani

collaborators

3 papers

gr-qc2026

Trapped photon region in the phase space of sub-extremal Kerr-Newman and Kerr-Sen spacetimes

Carla Cederbaum, Karim Mosani

We analyse the geometry and topology of the trapped photon region in the domain of outer communication of sub-extremal Kerr-Newman and Kerr-Sen spacetimes. Specifically, we show th…

math.DG2025

Conformal transformations of metric spaces and Lorentzian pre-length spaces

Miguel Manzano, Karim Mosani, Clemens Sämann +1

We introduce conformal transformations in the synthetic setting of metric spaces and Lorentzian (pre-)length spaces. Our main focus lies on the Lorentzian case, where, motivated by…

gr-qc2025

Geodesic causality in Kerr spacetimes with $∣ a ∣ \geq M$

Giulio Sanzeni, Karim Mosani

The analytic extension of the Kerr spacetimes into the negative radial region contains closed causal curves for any non-zero rotation parameter $a$ and mass parameter $M$ . Furtherm…

Trapped photon region in the phase space of sub-extremal Kerr-Newman and Kerr-Sen spacetimes

Conformal transformations of metric spaces and Lorentzian pre-length spaces

Geodesic causality in Kerr spacetimes with ∣a∣≥M

Geodesic causality in Kerr spacetimes with $∣ a ∣ \geq M$