= Saul Perlmutter
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= S. Perlmutter
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<Saul Perlmutter> led the Supernova Cosmology Project's measurement of cosmic expansion using 42 distant <Type Ia supernovae>. Their peak brightnesses were standardized through a relation between <light curve> width and <luminosity>, then compared with a nearby sample.
Fitting the magnitude–<cosmological redshift> relation constrained the matter and <cosmological constant> contributions together. The paper reported a joint parameter distribution and distinguished statistical errors from identified systematic effects. Its result favored a substantial <cosmological constant> contribution within the tested models, independently supporting the accelerating-expansion picture.<Measurements of Omega and Lambda from 42 High-Redshift Supernovae by Saul Perlmutter and others>[Abstract: sample, width–luminosity standardization, joint density constraints and uncertainty treatment]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Saul%20Perlmutter%2C%20PCAST%20Member%20%28cropped%29.jpg?width=250]
{title=Portrait of <Saul Perlmutter>}
{description=The White House, 2021 PCAST member portrait; existing Commons cropped version. Public domain in the United States: official-duty work by an employee of the Executive Office of the President. https://commons.wikimedia.org/wiki/Template:PD-USGov-POTUS[Source usage terms], via Wikimedia Commons.}
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