Sachs–Wolfe effect
Phenomenon of redshift in cosmology / From Wikipedia, the free encyclopedia
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The Sachs–Wolfe effect, named after Rainer K. Sachs and Arthur M. Wolfe,[1] is a property of the cosmic microwave background radiation (CMB), in which photons from the CMB are gravitationally redshifted, causing the CMB spectrum to appear uneven. This effect is the predominant source of fluctuations in the CMB for angular scales larger than about ten degrees.