= James M. Bardeen
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{tag=Physicist}
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<James M. Bardeen> developed methods for interpreting <motion> near rotating <black holes>. His 1972 paper with <William H. Press> and <Saul Teukolsky> introduced a practical local-frame treatment for particle <orbits> and radiation in the <Kerr metric>.
Locally nonrotating observers provide an orthonormal frame tied to the rotating geometry. Expressing measurable quantities in that frame clarifies which effects reflect local <motion> and which involve <frame dragging>.<Rotating Black Holes: Locally Nonrotating Frames, Energy Extraction, and Scalar Synchrotron Radiation by James M. Bardeen and others>[p. 347, abstract and introduction to locally nonrotating frames]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/JamesMBardeen1980.jpg?width=260]
{title=Portrait of <James M. Bardeen> in 1980}
{description=Via Wikimedia Commons; the linked file page provides image credits and usage information.}
{source=https://commons.wikimedia.org/wiki/File:JamesMBardeen1980.jpg}
{width=260}
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