Today , I read a article that a galactic satellite reveals where some of our galaxy's elusive material is hiding. So what will happen to Dark Matter? Is it also valid for other galaxies? May be there is nothing about Dark Matter, only there is missing material which we have not discovered yet.
http://www.scientificamerican.com/article/the-milky-way-s-missing-mass-partially-found/
What's a hard puzzle (Universe) that the mankind moils on it? Day by day everything becomes more snarl!
I think you misunderstood the content of the article : this deals about the missing baryon mass of the Galaxy. The whole point actually relies (as presented in the journalistic account) on the assumption that the cosmological ratio of Dark Matter to baryonic matter holds up at galactic scales. In that case, we expect much more baryonic material than meets the eyes, and this is what the science result is about. It says in substance that there is a new observational hint to the existence of a large halo of baryons surrounding the Milky Way, that correspond to a very large total mass; it does not say anything about Dark Matter..... but Dark Matter is one rationale (by no means the only one) to justify looking for missing baryons in our neighbourhood.
thank you for your answers. What is the Dark matter? cosmologists have discovered that 'regular' matter – the stuff we can see and that makes up stars, planets, rocks, gas clouds and dust – only accounts for a small fraction of the total mass in our Universe. Scientists call this 'regular' matter baryonic matter, so called because it is made up of particles called baryons. Dark matter is the name we give to matter we can not observe directly, and that appears to be made up of something other than baryons. Dear Johann, if the total mass of the baryon matter is increased, it means that mass ratio of the dark matter is decreased.
Ali,
1/ What is Dark Matter? We do not know : perhaps it is a new elusive particle, beyond the standard model, perhaps it is a modification of the physical laws we take for granted. Take the Dark Matter problem as a "missing mass" problem.
2/ "if the total mass of the baryon matter is increased, it means that mass ratio of the dark matter is decreased." : the total baryon mass is increased, so that the ratio computed at Galactic scale is closer to the one computed at cosmological scale. The ratio to Dark Matter is provided by the cosmological fit in the context of this article, so it does not change. The point at the start of the article is that : if this cosmological ratio holds at galactic scale, then we are missing baryon mass in the Milky Way, and so where is it? HTH
There is a solution to the Dark Matter enigma. Although this solution is technically simple it requires us to radically revise our ideas of existence, which academia seems unprepared for. We now believe that cosmos expands by changing the metrical scale of space. This is the Big Bang picture. However, it may instead expand by changing the metrical scale of both space and time, i.e. the cosmos may expand by changing its scale. Since cosmological scale expansion may be perpetual it will eliminate the Big Bang creation event. However, it will also alter fundamental laws of physics, and this would explain the flat rotation curves in galaxies as being due to cosmological scale expansion rather than to some kind of mysterious Dark Matter halo. And, cosmological scale expansion would solve the Dark Energy puzzle, which also may be caused by using the wrong cosmological BB model. See further my book:
http://www.amazon.com/Progression-Time-expansion-powers-universe/dp/1456574345/ref=asap_bc?ie=UTF8
The Russian Academy of Sciences recently asked me to summarize my book in a “Technical Monograph”, which RAS has printed in hardcover book form. It is now being distributed to universities and book stores across Russia. It thus appears that the Russians are more open than the West to new ideas in cosmology!
Dear Johan Masreliez and Mohamed El Naschie, as you can see by your own comments, there are not one but many proposed solutions to the Dark Matter enigma. I will be very happy to try to understand either of your proposal further. But as days only have 24 hours and I have a lot of work already, I kindly ask you to convene together offline and decide first which one of your two proposals I should try to understand next. I have long given up on hoping to get a good grasp of all the DM solution proposals that fly around! Sad, but true.... In the meantime, I strongly suggest that we not hijack a thread with considerations that are not directly related to the question asked by the OP.
Ali, I did not see your request before today. I will try to read your arxiv paper in the coming days, if I find time, and if Johan and Mohamed do not come too quickly within agreement! :)
Yes, “everything has been solved by a nice theory”. However, academia may not think it’s that nice because it disagrees with standard physics. This new theory is published in a book:
http://www.amazon.com/Progression-Time-expansion-powers-universe/dp/1456574345/ref=asap_bc?ie=UTF8
A technical monograph on the theory has also been published by the Russian Academy of Sciences and distributed to 45 universities, libraries and bookstores across Russia.
The answer is that Newtonian dynamics no longer apply on cosmological scales. The cosmos expands by increasing its metrical scale, which leads to new physics. By this new physics the stars move on spiral orbits with constant tangential velocities. This is what we see; therefore there is no Dark Matter.
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