Kavli Institute for the Physics and Mathematics of the Universe | University of Tokyo | 2018 Sep 26
Einstein’s general theory of relativity has helped an international team of researchers measure the lumpiness of dark matter in our Universe today by analyzing images of 10 million distant galaxies, and further use it to understand dark energy.
Dark matter is responsible for the formation of galaxies in the Universe, while dark energy is responsible for the acceleration in the Universe’s ongoing expansion. Together dark matter and dark energy make up 95 percent of our Universe, but why this number is so big remains a mystery. To explain the behavior and the fate of the Universe, scientists must find out what dark matter and dark energy are.
Studies to measure the amount of cosmic structure have been carried out in the past, especially when the Universe was very young, such as the European Space Agency Planck satellite. Dark energy can affect the growth rate of these structures at a later time, closer to today. Scientists are just starting to measure the growth of these structures by studying dark matter in the later Universe and thus using it to learn about dark energy. ...
Cosmology from Cosmic Shear Power Spectra with Subaru Hyper Suprime-Cam First-Year Data ~ Chiaki Hikage et al
- arXiv.org > astro-ph > arXiv:1809.09148 > 24 Sep 2018