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Missing matter found in the cosmic web
The article "Missing matter found in the cosmic web" in Nature of 21
June 2018 (See https://www.nature.com/articles/d41586-018-05432-2) Starts with the following sentence: "We live in a dark Universe: just 5% of it consists of ordinary matter such as that found in atoms, whereas the rest is `dark' matter and energy that cannot currently be detected directly" The word dark is written within '' indicating doubt. Accordingly to https://en.wikipedia.org/wiki/Dark_matter: "In the standard Lambda-CDM model of cosmology, the total mass-energy of the universe contains 4.9% ordinary matter and energy, 26.8% dark matter and 68.3% of an unknown form of energy known as dark energy. Thus, dark matter constitutes 84.5% of total mass, while dark energy plus dark matter constitute 95.1% of total mass-energy content." Next we read in the nature article: "However, observations of the nearby Universe suggest that up to 40% of this ordinary matter---which is made up primarily of particles known as baryons---is missing" This is a strange twist. What we observe/measure are 1) galaxy rotation curves and 2) an expanding universe. What we also observe is 3) stars and baryonic matter throughout the universe. However the amount found as #3 is not enough to explain #1 and #2. To solve this issue we introduced the concepts of dark (missing) matter and dark energy. And this missing matter is supposed to be nonbaryonic. However accoringly to Wikipedia there is also a Missing baryon problem. See: https://en.wikipedia.org/wiki/Missing_baryon_problem. That means there are two problems: 1) A dark matter problem and 2) a Missing baryon problem. (In reality there are more issues: CMBR and BB nucleosynthesis) What this article indicates is that there is much more baryonic matter in the cosmic web (Universe) as original thought. To me this seems logical because more and more ordinary matter becomes visible because technology improves. My question is why is newly found matter 'clasified' as a solution for problem #2 (and not #1) Different question: Why are there two problems in the first place? Maybe Fig 4 at page 408 shows the answer. They mention the word Local Universe which makes everything much more complex. Nicolaas Vroom http://users.pandora.be/nicvroom/ |
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