اسکر ِ ریز-سیاما oskar-e Rees-Sciama
*Fr.: effet de Rees-Sciama*
The → *Sachs-Wolfe effect* in which the calculations
are extended to nonlinear mass concentrations. In the non-linear regime
of large-scale → *structure formation *
the → *gravitational potential* changes with time,
and photons climb out of a → *potential well*
slightly different from the one that they fell into.
Therefore, nonlinear density fluctuations produce extra evolution of the
potentials against the background expansion.
On large scales, the nonlinear contribution to the
full ISW effect is expected to be dominated by the linear ISW
effect in a Universe with → *cosmological constant*
(Seljak, 1996, ApJ 460, 549). Martin J. Rees (1942-) & Dennis W. Sciama (1926-1999), 1968,
Nature 217, 511; → *effect*. |