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A Beginner's Guide to Black Hole Imaging and Associated Tests of General Relativity
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Following the 2019 release by the Event Horizon Telescope Collaboration of the first pictures of a supermassive black hole, there has been an explosion of interest in black hole images, their theoretical interpretation, and their potential use in tests of general relativity. The literature on the subject has now become so vast that an introductory guide for newcomers would appear welcome. Here, we aim to provide an accessible entry point to this growing field, with a particular focus on the black hole "photon ring": the bright, narrow ring of light that dominates images of a black hole and belongs to the black hole itself, rather than to its surrounding plasma. Far from an exhaustive review, this beginner's guide offers a pedagogical review of the key basic concepts and a brief summary of some results at the research frontier.
Forward citations
Cited by 5 Pith papers
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Shadows of generalised Hayward spacetimes : in vacuum and with plasma
Shadows of generalized Hayward spacetimes are computed in vacuum and plasma, and EHT Sgr A* constraints favor wormholes with multi-peak effective potentials over single-peak ones.
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Towards a Non-singular Paradigm of Black Hole Physics
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Signatures of Black Hole Spin in Horizon-Scale Polarimetry
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