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Ratio baryonic versus non-baryonic matter in the Universe.
The article:
https://www.newscientist.com/article...finally-found/ claims that: "Half the universe's missing matter has just been finally found" implying that a lot of dark matter is not non-baryonic but baryonic (i.e. ordinary matter) The article mentions: https://arxiv.org/abs/1709.10378v1 with the title: "Missing baryons in the cosmic web revealed by the Sunyaev-Zel'dovich effect" https://arxiv.org/abs/1709.05024 with the title: A Search for Warm/Hot Gas Filaments Between Pairs of SDSS Luminous Red Galaxies A article in with a different opinion: https://www.forbes.com/sites/startsw...g-matter-foun= d-but-doesnt-dent-dark-matter/#499df136faf7 "Missing Matter Found, But Doesn't Dent Dark Matter" This article reads: "The fact that about 5% of the Universe's energy is in normal matter, 27% is dark matter, and the other 68% is dark energy has been known for nearly 20 years now, but it remains as puzzling as ever." Most(?) of this comes from studying the CMB radiation. The article also states: "But light plays a major role, too. Stars shine etc so measuring the light coming from all of them tells you how much mass there is." The problem of course is that there is a lot of (?) baryonic matter which does not shine. https://en.wikipedia.org/wiki/Cosmic...ave_background We read: "The angular scale of the first peak determines the curvature of the universe (but not the topology of the universe). The next peakā=80_ratio of the odd peaks to the even peaksā=80_determines the reduced baryon density. The third peak can be used to get information about the dark-matter density." I assume the non-baryonic density. This raises a serious issue: How can these CMB peaks be trusted and be used to make predictions when observations reveal that the ratio baryonic versus= non-baryonic matter has changed? Nicolaas Vroom |
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Ratio baryonic versus non-baryonic matter in the Universe.
In article ,
Nicolaas Vroom writes: The article: https://www.newscientist.com/article...ses-missing-m= atter-has-just-been-finally-found/ claims that: "Half the universe's missing matter has just been finally found" implying that a lot of dark matter is not non-baryonic but baryonic (i.e. ordinary matter) The standard number is that much less than half of the missing matter can be baryonic. A article in with a different opinion: https://www.forbes.com/sites/startsw...ing-matter-fo= un= d-but-doesnt-dent-dark-matter/#499df136faf7 "Missing Matter Found, But Doesn't Dent Dark Matter" Right. This article reads: "The fact that about 5% of the Universe's energy is in normal matter, 27% is dark matter, and the other 68% is dark energy has been known for nearly 20 years now, Right. but it remains as puzzling as ever." Whether it's puzzling is another question, but that's the way it is. Most(?) of this comes from studying the CMB radiation. Yes, the CMB provides good constraints, but is also in agreement with other tests. The article also states: "But light plays a major role, too. Stars shine etc so measuring the light coming from all of them tells you how much mass there is." The problem of course is that there is a lot of (?) baryonic matter which does not shine. This is also nothing new. What is new is that some of it might have been found. https://en.wikipedia.org/wiki/Cosmic...ave_background We read: "The angular scale of the first peak determines the curvature of the universe (but not the topology of the universe). The next peak---ratio of the odd peaks to the even peaks---determines the reduced baryon density. The third peak can be used to get information about the dark-matter density." I assume the non-baryonic density. Right. This raises a serious issue: How can these CMB peaks be trusted and be used to make predictions when observations reveal that the ratio baryonic versus non-baryonic matter has changed? The only thing which has changed is the ratio of KNOWN baryonic matter to non-baryonic matter. |
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