{"id":2789,"date":"2023-04-04T00:00:26","date_gmt":"2023-04-03T15:00:26","guid":{"rendered":"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/?p=2789"},"modified":"2023-04-04T00:07:50","modified_gmt":"2023-04-03T15:07:50","slug":"2789","status":"publish","type":"post","link":"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/blog\/2023\/04\/04\/2789\/","title":{"rendered":"[Research] How to see the invisible: Using dark matter distribution to test our cosmological model"},"content":{"rendered":"
\"\"
The Subaru HSC image (Credit: HSC-SSP project & NAOJ)<\/figcaption><\/figure>\n

An international team of astrophysicists and cosmologists at various institutes including Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI) at Nagoya University, the Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU) at the University of Tokyo, and Princeton University have submitted a set of five papers, measuring the a value for the \u201cclumpiness\u201d of the universe\u2019s dark matter, known to cosmologists as S8<\/sub>, of 0.76, which aligns with values that other gravitational lensing surveys have found in looking at the relatively recent universe \u2014 but it does not align with the value of 0.83 derived from the Cosmic Microwave Background, which dates back to the universe\u2019s origins when the universe was about 380,000 years old. <\/p>\n

\"\"
The measurement results of S8<\/sub> parameter from Subaru Hyper Suprime-Cam (HSC) Year 3 data<\/figcaption><\/figure>\n

The gap between these two values is small, but as more and more studies confirm each of the two values, it doesn\u2019t appear to be accidental. The possibilities are that there\u2019s some as-yet unrecognized error or mistake in one of these two measurements or the standard cosmological model is incomplete in some interesting way. <\/p>\n

Hironao Miyatake, Associate Professor at KMI, says:<\/p>\n

\nThe data analysis in the third year of the Subaru Telescope has made more certain the breakdown of the Standard Model of the Universe, which has not been broken for 20 years. From now on, we will gradually enter the phase of searching for what new physics will emerge from the breakdown of the Standard Model of the Universe. I am very excited to continue working on this big problem together with young researchers who have gained experience through this analysis.\n<\/p><\/blockquote>\n

Please read the press release<\/a> for further information.<\/p>\n

Related Links<\/h2>\n