Questions about the source or effects of the matter that makes up 85% of the matter in the universe but appears to only interact gravitationally.
Questions tagged [dark-matter]
215 questions
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What is the estimated density of the dark matter?
What is the estimated density of the dark matter? Some clumps of dark matter might have higher density and others might have lower density. So what is the estimated density range of dark matter?
Is it possible for clumps dense enough like for…
Joe Jobs
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How can dark matter be observed?
Look at this picture:
It looks as if dark matter is observed. But what is actually observed? doesn't this picture prove MOND and emergent gravity (both assuming a different gravity tied to normal, non-dark matter only) wrong?
Deschele Schilder
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Could dark matter form coherent bodies the size of stars or planets?
Is it possible that dark matter could collapse gravitationally, forming massive bodies similar to stars or planets?
When I say "similar", I don't mean to imply that they would undergo nuclear fusion or have solid surfaces, merely that gravitational…
Keith Thompson
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How does the amount of dark matter in measured galaxies vary?
I have recently viewed two news articles announcing a galaxy composed almost entirely of dark matter and one with hardly any. This made me wonder if there is a "continuum" of percentages of dark matter in galaxies, where it has been measured, or if…
Jack R. Woods
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Galaxy discovered lacking Dark Matter
Recently a Galaxy was discovered that contained no Dark Matter. I was wondering what explanation could be offered for this ? This Galaxy also contains only 1% as many Stars as our Milky Way does . Is there be a connection between these two things,…
Peter U
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How is dark matter different from ordinary (visible) matter?
How is dark matter different from ordinary (visible) matter?
1) Does dark matter consists of invisible astronomical objects like white dwarfs, black holes?
2) Has dark matter not been directly observed?
Is there a better explanation for dark matter.…
Basak
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Who found the existence of Dark Matter?
Dark Matter's observational evidence is widely attributed to Vera Rubin based on her observation of galaxy rotation curves with Kent Ford in 1970s, which was later confirmed by Albert Bosma in 1978.
However, it was in the late 1930s that Fritz…
Janus Boffin
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Is dark matter influenced by gravity of baryonic matter?
As far as I know galaxies and clusters form along so-called "galactic filaments" which are influenced by a dark matter web that organises them in to this position in the universe. So it looks like dark matter attracts baryonic matter by a kind of…
Marijn
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How can we measure the amount of Dark Matter in the universe to the level of a percent?
Through phenomena that scientists have observed we know that dark matter is a big player in maintaining a constant speed of objects in a galaxy which means that dark matter is an active participant. Now many scientists have concluded that dark…
Shubhankar Dixit
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People Working on Dark Matter Simulations
I am interested in simulations regarding dark matter. I am looking for more details and reading material on the same. I was really hoping to get some guidance from someone working in that field. Can you guys please drop the names of some people that…
Khurana
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Could dark matter exist in the Universe in the form of sufficiently dense objects?
Albert Sneppen's publication
"Divergent Reflections around the Photon Sphere of a Black Hole" provides the math related to the issue which in common language could be described as "how the universe is reflected near black holes".
Black holes are…
Alex
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Dark matter and vacuum
How different would space have been if there was no dark matter?
Can space be considered vacuum even when occupied with abundant dark matter?
Shreya Soni
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2
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Dark matter emitting EM radiations beyond our currently known spectrum?
Could it be possible that dark matter is emitting EM radiations on a scale that is not known or perceivable by humans yet and undetectable by man-made instruments?
A type of radiation that our instruments were just not designed to pick up on? Being…
Pre-alpha
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2
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1-parameter NFW dark matter profile
This should be a straightforward exercise, but I'm struggling. Help is much appreciated
I would like to parameterize a Navarro-Frenk-White profile with one parameter, using the correlation between total mass and the concentration.
As a starting…
user1991
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Is Dark Matter moving?
It sounds like dark matter makes up one quarter of the universe's mass-energy. And it's density is fairly uniform. But could it be simultaneously both uniform and moving - like currents in a lake. Does it have a standing wave? A propagating…
scorpdaddy
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