An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 1 Search : Sachs-Wolfe effect
Sachs-Wolfe effect
  اُسکر ِ زاخس-وُلف   
oskar-e Sachs-Wolfe

Fr.: effet de Sachs-Wolfe   

The effect of gravitational potentials on the → anisotropy of the → cosmic microwave background radiation, 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 above about 10 degrees. It involves two parts: the effect of the potential at the → surface of last scattering, which is the ordinary Sachs-Wolfe effect. And the integrated Sachs-Wolfe effect, which depends on the change of the gravitational potential while photons of the CMB are passing through a → potential well.

Named after Rainer Kurt Sachs (1932- ) and Arthur Michael Wolfe (1939- ), who were the first to calculate this effect in 1967 (ApJ 147, 73); → effect.