2 papers
gr-qc2025
Twisting shadows: Light rings, lensing and shadows of black holes in swirling universes
Zeus S. Moreira, Carlos A. R. Herdeiro, LuÃs C. B. Crispino
Using the Ernst formalism, a novel solution of vacuum general relativity (GR) was recently obtained [1], describing a Schwarzschild black hole (BH) immersed in a nonasymptotically…
gr-qc2025
Ergoregion instability in a fluid with vorticity
Leandro A. Oliveira, Carolina L. Benone, LuÃs C. B. Crispino
We investigate perturbations in a rotational and incompressible fluid flow. Interested in the phenomenon analogous to the black hole ergoregion instability, we verify the influence…