Probing black hole spacetimes with shadows and photon rings
Published on:
2 November 2023
Primary Category:
General Relativity and Quantum Cosmology
Paper Authors:
Kiana Salehi,
Avery Broderick,
Boris Georgiev
Bullets
Key Details
Presents a formulation of spinning black hole spacetimes separating event horizon and ergosphere functions
Derives expressions for shadow size and photon rings for a polar observer
Finds measurements independent of ergosphere properties
Generalizes prior characterizations of spherical spacetimes
Provides framework to constrain spinning spacetimes from observations
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AI generated summary
Probing black hole spacetimes with shadows and photon rings
This paper presents a formulation of spinning black hole spacetimes that separates functions controlling the event horizon and ergosphere. It explores how measurements of the black hole shadow size and photon rings for a polar observer probe these functions. The results generalize prior characterizations for spherical spacetimes. Notably, these measurements do not depend on ergosphere properties. This provides a framework to constrain spinning spacetimes from observations without assumptions about small deviations from Kerr.
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