 |
 |
Dark Matter
An unknown matter that accounts for 23% of the total mass in the Universe. Dark matter is not directly detectable because it emits no radiations.
The Universe started with the Big Bang, and the small spatial inhomogeneities in this early era eventually grew into stars and galaxies. The presence of unknown matter was inferred from the observation of its gravitational interactions with visible matters, and dark matter was postulated to account for the missing masses in galaxies and beyond. The Wilkinson Microwave Anisotropy Probe (WMAP) satellite launched by NASA in 2001 showed that dark matter makes up 23% of the total mass in the Universe. The best candidate for dark matter is a supersymmetric particle (SUSY), neutralino. An example of experimental searches for these dark matters in Japan is the water tank observatory constructed 1 kilometer below the summit level in Kamioka mine. Another approach is to produce them in a laboratory, and the large proton accelerator, the Large Hadron Collider (LHC), at the European Organization for Nuclear Research (CERN) may be able to detect man-made dark matters.
The Universe started with the Big Bang, and the small spatial inhomogeneities in this early era eventually grew into stars and galaxies. The presence of unknown matter was inferred from the observation of its gravitational interactions with visible matters, and dark matter was postulated to account for the missing masses in galaxies and beyond. The Wilkinson Microwave Anisotropy Probe (WMAP) satellite launched by NASA in 2001 showed that dark matter makes up 23% of the total mass in the Universe. The best candidate for dark matter is a supersymmetric particle (SUSY), neutralino. An example of experimental searches for these dark matters in Japan is the water tank observatory constructed 1 kilometer below the summit level in Kamioka mine. Another approach is to produce them in a laboratory, and the large proton accelerator, the Large Hadron Collider (LHC), at the European Organization for Nuclear Research (CERN) may be able to detect man-made dark matters.
