3 papers
gr-qc2026
Chaos and fractals of the black hole photon ring
Roman Berens, Peter Galison, Trevor Gravely +2
The photon ring of a Kerr black hole decomposes into a self-similar hierarchy of subrings. Here, we show that this self-similar structure persists in phase space. Moreover, near th…
gr-qc2026
Black Hole Vision: An Interactive iOS Application for Visualizing Black Holes
Roman Berens, Dominic O. Chang, Trevor Gravely +1
The Black Hole Explorer (BHEX) is a proposed mission to launch a sub-millimeter radio telescope into Earth orbit that will take the sharpest images in the history of astronomy and…
gr-qc2025
Gravitational Waves on Kerr Black Holes II: Metric Reconstruction with Cosmological Constant
Roman Berens, Trevor Gravely, Alexandru Lupsasca
In this second paper of our series started with \cite{Berens2024}, we investigate linearized gravitational perturbations of a rotating Kerr black hole in a non-asymptotically flat…