Dark Energy Detected with Supervoids and Superclusters

Understand

The observed apparent acceleration of the universe is usually attributed to negative pressure from a mysterious dark energy.

• This acceleration causes the gravitational potential to decay, heating or cooling photons travelling through crests or troughs of large-scale matter density fluctuations.
• This phenomenon, the late-time integrated Sachs-Wolfe (ISW) effect, has been detected, albeit at low significance, by cross-correlating various galaxy surveys with the Cosmic Microwave Background (CMB).
• Recently, the best evidence has come from the statistical combination of results from multiple correlated galaxy data sets.