= William H. Press
{c}
{tag=Physicist}
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<William H. Press> coauthored a quantitative treatment of physical processes around rotating <black holes>. With <James M. Bardeen> and <Saul Teukolsky>, he organized measurements using locally nonrotating frames in the <Kerr metric>.
Their applications distinguished a permitted energy-extraction process from an efficient astrophysical mechanism. Studying the required local particle <velocities> and <orbits> exposed restrictions that an energy-conservation argument alone would miss.<Rotating Black Holes: Locally Nonrotating Frames, Energy Extraction, and Scalar Synchrotron Radiation by James M. Bardeen and others>[p. 347, abstract: local frames, energy extraction and orbital restrictions]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/William%20Press%2C%20PCAST%20Member%20%28cropped%29.jpg?width=250]
{title=Portrait of <William H. Press>}
{description=The White House, PCAST portrait, 2021; existing crop by Clay. Public domain in the United States: official-duty work of an Executive Office of the President employee. https://commons.wikimedia.org/wiki/Template:PD-USGov-POTUS[Source usage terms], via Wikimedia Commons.}
{source=https://commons.wikimedia.org/wiki/File:William_Press%2C_PCAST_Member_%28cropped%29.jpg}
{width=250}
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