Uniform Distribution of Dark Energy and Detecting Dark Photons with Telescopes

A study using the eROSITA X-ray telescope has found that dark energy, which causes the accelerating expansion of the universe, is uniformly distributed in space and constant in time. The study used data from the eFEDS survey, which found about 500 low-mass galaxy clusters, and optical data from the Hyper Suprime-Cam Subaru Strategic Program. The results suggest that dark energy makes up around 76% of total energy density in the universe and can be described by a simple constant, known as the cosmological constant.