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dc.contributor.authorGralla, Samuel E.
dc.contributor.authorLupsasca, Alexandru
dc.date.accessioned2021-04-01T20:29:25Z
dc.date.available2021-04-01T20:29:25Z
dc.date.issued2020-02-14
dc.identifier.citationGralla, S. E., & Lupsasca, A. (2020). Lensing by Kerr black holes. Physical Review D, 101(4), 044031.en_US
dc.identifier.issn2470-0010
dc.identifier.doi10.1103/physrevd.101.044031
dc.identifier.urihttp://hdl.handle.net/10150/657275
dc.description.abstractInterpreting horizon-scale observations of astrophysical black holes demands a general understanding of null geodesics in the Kerr spacetime. These may be divided into two classes: "direct" rays that primarily determine the observational appearance of a given source, and highly bent rays that produce a nested sequence of exponentially demagnified images of the main emission: the so-called "photon ring." We develop heuristics that characterize the direct rays and study the highly bent geodesics analytically. We define three critical parameters gamma, delta, and tau that respectively control the demagnification, rotation, and time delay of successive images of the source, thereby providing an analytic theory of the photon ring. These observable parameters encode universal effects of general relativity, independent of the details of the emitting matter.en_US
dc.description.sponsorshipNational Science Foundationen_US
dc.language.isoenen_US
dc.publisherAMER PHYSICAL SOCen_US
dc.rights© 2020 American Physical Society.en_US
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en_US
dc.titleLensing by Kerr black holesen_US
dc.typeArticleen_US
dc.identifier.eissn2470-0029
dc.contributor.departmentUniv Arizona, Dept Physen_US
dc.identifier.journalPHYSICAL REVIEW Den_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.journaltitlePhysical Review D
dc.source.volume101
dc.source.issue4
refterms.dateFOA2021-04-01T20:29:35Z


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