Astrophysics (index)about

Sachs-Wolfe effect

(SWE, SWeffect, SW effect)
(gravitational redshift of the CMB)

The Sachs-Wolfe effect (SW effect, SWE) is the temperature anisotropy of the cosmic microwave background resulting from gravitational redshift, and is the favored primary explanation for CMB fluctuations over angular scales above ten degrees.

The non-integrated Sachs-Wolfe effect is gravitational redshift at the time of the last scattering (recombination). The integrated Sachs-Wolfe effect (or ISW) is an effect on the radiation after recombination, and reflects the matter and energy distribution since.

Efforts are made to associate observed anisotropy with the effect through correlations and by attempting to pin the apparent effects to known features, i.e., galaxy clusters and voids.


Referenced by:
gravitational redshift