| 释义 |
Sachs-Wolfe effect
Sachs–Wolfe effect (saks wûlf) The process by which density fluctuations in the early Universe have left an imprint on the cosmic microwave background radiation. It is caused by the interaction of photons with a gravitational field with density fluctuations. This causes small variations in the temperature. It is thought that the ‘ripples' found by the COBE satellite were due to the Sachs–Wolfe effect. The effect was predicted by Rainer Kurt Sachs and Arthur Michael Wolfe in 1967. See also structure formation. |