All Questions
Tagged with astronomy dark-matter
41
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Can dark matter be isolated from baryonic matter?
The above is an image to test Verlinde's emergent gravity theory (2016, https://arxiv.org/abs/1611.02269). The research team observered galaxies and masses beyond, used gravitational lensing (y-axis) ...
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Does NFW profile work for any galaxy?
We use Navarro–Frenk–White (NFW) to calculate Dark Matter (DM) density. Can we use it for DM halo in any galaxy or is it used only for Milky Way (MW)?
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What if dark matter/energy did not exist?
What if dark matter and dark energy did not exist and were only due to a misinterpretation of the red shift of light or a measurement bias?
What would be the implications/consequences?
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What happens to objects along spiral galaxy arms over long periods of time?
Observations of spiral galaxies reveal that objects within the same arm of a spiral galaxy move at around the same speeds, regardless of their distance from the center of the galaxy. Conversely, the ...
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Likelihood of MACHOs being the best candidate for dark matter
Massive compact halo objects ("MACHOs") include a wide variety of hardly detectable bodies such as brown / white / black dwarfs and black holes, to name a few. If we take into account the ...
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Is dark matter present in all galaxies?
The rotation speeds of nearby galaxies like M31 or our own milky way are determined by observations. And we know there that luminous mass does not explain the rotation curve. Are there any galaxies ...
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In what type of trajectory do the Magellanic clouds move through our galaxy?
In what type of trajectory do the Magellanic clouds move through our galaxy? Can be estimated is it a elliptical, parabolic or hyperbolic trajectory? Although it may be a problem due to dark matter ...
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159
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What are the exclusion limits on WIMPs?
As I understand the way dark matter WIMP exclusion plots work, they are cross-sections (usually 2D) of the fuzzy boundary surface of a hyperdimensional property space, defining a fuzzy volume of that ...
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109
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Why a decaying dark matter?
I'm reading some papers (model, exp and model) that are dealing with decaying models of DM, why is it interesting? What are the signatures that this type of model can give to observe DM?
I am ...
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What sort of observations constrain the QCD interactions of dark matter?
Within our current limits of observation, dark matter (DM) is nonluminous i.e., it neither absorbs nor gives off electromagnetic (EM) radiation. This tells that DM is electrically neutral having no EM ...
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Why can't dark matter lose energy by gravitational waves and collapse into itself?
Because of lack of electromagnetic induction, dark matter can't lose its gravitational potential energy. That is preventing it from collapsing like an ordinary matter cloud in space.
But why can't ...
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Rotational velocity due to Dark matter
I was wondering if we can predict the rotational velocity due to dark matter in this way:
Consider that we theoretically derived the rotational velocity of a galaxy ($v_{the}$). Then from experiment ...
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2
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Is dark matter paramagnetic/diamagnetic?
From my understanding, constrains on the interaction of dark matter with electromagnetic fields comes from the lack of scattering/absorption/emission of light.
But, do we know anything of its DC ...
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What is the gas distribution in galaxies?
I'm fitting a number of galaxy rotation curves, and I need the density distributions of stars, gas, and DM. I know that the baryonic disk densities fall off exponentially (the characteristic radii can ...
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Why couldn’t dark matter be from advanced technologies? [closed]
(Coming from a layman)
Why couldn’t dark matter be the consequence of advanced technology?
For many reasons I can imagine that the game theory for intelligent life is to eventually hide/ camouflage ...
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