dark-matter's questions - English 1answer

528 dark-matter questions.

A major reason for believing in the existence of dark matter is that the stars in the outer regions of galaxies are moving too fast to remain bound to their galaxies, given only the estimated mass of ...

Can light be shifted or stopped by anything other than a solid? I ask because when observing black holes you can see light funneling into the sphere. My thought was that if what’s being pulled into ...

Today, I was watching the Inexplicable Universe with Neil deGrasse Tyson. He spoke about Dark Matter, Dark Energy, and then he spoke about Tachyons. Naively, I thought what if the reason we can't ...

I've been reading/hearing that if the AMS satellite measures a significant flux of anti-helium in cosmic rays, that would be an irrefutable proof of dark matter. I was wondering: Why is that? what is ...

I am a physics student and as far as I know dark matter is beyond the topics included in my grade career. Are there any serious book on the subject? Any serious set of lectures somewhere in Internet?

I'm an astrophysics student and I've been researching this topic and there is one point that keeps eluding me. How did the scientific community realize that there had to be dark matter in the ...

The problem of the universe not fully forming without Using the Dark Matter lamda fix may be explained by this thought experiment. The thought of space time compressing smaller and smaller if we ran ...

My (possibly poor) understanding of the argument for Dark Matter's existence is that stars in a large galaxy move more slowly than "they should" (presumably due to either some simplified model of the ...

This isn't a question as such, but I would like to present to you my theory which may solve some of the great mysteries of the universe. This is my first post, am I allowed to link here? I am eager ...

I'm trying to estimate the local density of dark matter at a given radius, $r=R_0=8\text{kpc}$. I also have values for the core radius, $a=5\text{kpc}$, and circular velocity of the Sun, $v_{\text{...

It's my understanding that the mechanism behind Coronal Heating - why the Corona is so much hotter (> 1,000,000 K) than the surface of the Sun (6,000 K), and the mechanism by which the energy gets ...

I have read these questions and their answers: Dark matter black holes Could Dark Matter form black hole? Does dark matter originate from matter falling into a black hole? following up dark matter ...

I am not a physicist and apologize if this wastes anyone's time. I follow progress in most theoretical fields of physics and understand the premises but not how they are realised. The question I posed ...

The dark matter particle has NOT been found. Despite the quantity of models, I wonder if dark matter could be some (exotic) type of (interacting) gravitons. Is that possible?

I am intrigued by the close relationship of dark matter with gravity. Could they be the same thing?

I am a homeschooled student in year 7. I am interested in dark matter. Specifically its formation. I am curious about when and how dark matter was first formed. Also what part it played in the ...

I am a physics student and don't know very much about dark matter nor cosmology. But today I went to a talk in which the speaker showed us this image (or a very similar one): showing how the ...

If dark matter consists of some kind of particles that can be described by String Theory, could we be able to describe this kind of strings ("dark strings", i.e, the strings which give rises to dark ...

What is the effect of a significant amount (considering $f_{\chi,\text{int}}$, the fraction of DM interacting with SM by mass, is very close to 1) of DM scattering with SM particles on the CMB power ...

If there is dark matter (Degrasse Tyson likes to call it "dark gravity"), would it diffract light? If so, how could this be differentiated from gravitational lensing? By spectroscopy?

There have been a number of papers on the astronomically observed 3.5keV line, the most recent being "Searching for the 3.5 keV Line in the Deep Fields with Chandra: The 10 Ms Observations". These ...

We are told the universe is expanding at anything between 68 and 73km per second, per megaparsec (depending on the places you look) - so by association, the space between us and anything else out ...

If dark matter interacts with ordinary matter at all, it should most likely occur where ordinary matter is densest. Hence we have papers about neutron stars possibly containing dark matter cores (...

In Dodelson's book, the equation for a scattering process $ a + b \Leftrightarrow c + d $ is given as \begin{align} a^{-3} \frac{\mathrm d (n_a a^3)}{\mathrm d t}&=-n^{\text{eq}}_a n^{\text{eq}}...

In addition to the functioning LIGO detectors (two in USA and one in Italy), I am aware there are some gravitation wave detectors under construction. More detectors should provide more statistical ...

I would like to test a theory I have regarding movement of stars and galaxy and the dark matter hypothesis. For that, I will have to write or adapt an $N$-body simulator. But before testing this ...

I have read that people are trying to argue whether neutrino is part of hot dark matter but anyhow, I know that dark matter can only interact with gravity and gravity only (they cannot interact with ...

Few reasons to believe Dark Matter is Majorana fermion: https://arxiv.org/abs/1711.03877: second contra argument by Jordan and Pauli. "A non vanishing zero-point energy of elementary fields should ...

Dark matter does not interact with electromagnetic radiation. Neutrinos also don't interact via electromagnetism, which would make neutrinos a good candidate for dark matter. However because of the ...

Dark Matter is either electrically neutral or "barely'' charged because if it were charged it would have interacted with light. However, experimentally one can never say something is zero. Therefore, ...

Heat has to go somewhere. Would the light and heat of the stars in the universe amount up to being dark matter ...and dark energy ... Dark matter would just be small pieces of stuff. Dark energy ...

This well-cited paper talks about a minimal renormalizable extension to the Standard Model (SM) to incorporate particle dark matter (DM) into it by adding a real scalar field $S$ which (unlike the ...

This recent paper in Nature (also see here$^1$) claimed to have discovered a galaxy without dark matter. However, in the Standard paradigm of cosmology dark matter played a crucial role in the ...

I was thinking about the following reasoning: If a matter and antimatter reaction produces energy, this energy would have particles itself. I found out (reading...) that one (the main?) product are ...

The news, that some galaxies have dark matter and others do not, leads to the question of how this could be possible. If galaxies are merely groups of stars that gathered together (under ...

As far as we know, the particles of dark matter can interact with each other only by gravitation. No electromagnetics, no weak force, no strong force. So, let's suppose a local slight concentration ...

Ordinary matter clumps under gravitational attraction only when it loses energy through radiation. Dark matter supposedly doesn't clump since it can only exchange energy with itself and ordinary ...

This well-cited paper talks about is a minimal renormalizable extension to the Standard Model (SM) to incorporate particle dark matter (DM) into it by adding a real scalar field $S$ which (unlike the ...

I was reading today about the birth of the Universe and the conjectures about the matter that was supposed to exist at the moment of the Big Bang and what can be measured now. There seems to be some ...

Matter makes up roughly $5\%$ of the Universe while dark matter makes up roughly $25\%$. For matter and radiation, we have a complicated Standard model with many generations of fermions and various ...

Does a satellite galaxy’s orbital velocity decrease with distance from the large galaxy, (similar to planets orbiting a star), or do they orbit faster than expected without invoking dark matter (...

I've been reading a lot trough different articles about dark-matter and dark-energy and how they could explain observations such as the acceleration of the expansion of the universe or the ...

Is it possible that M-Theory provides a solution to the mystery of dark matter and dark energy? The idea of dark matter and dark energy is that there is some inexplicable source affecting our ...

I watched a YouTube post on a channel that normally has solid information about astronomy (as far as I can tell). But this episode states that (emphasis mine) …talking about the controversial ...

I have read through this Wikipedia article on Dark Matter and it contains references to the methods used to demonstrate the existence of dark matter. A galaxy rotation curve is a plot of the ...

Do we need to invoke the existence of dark matter to explain the orbital distance of a sample satellite galaxy? Or is the observed visible matter enough to be able to justify the gravitational ...

I know most scientists, if not all scientists, believe Dark Matter cannot be accounted for by baryonic matter. And I don't mean baryonic matter that is unseen because it is not emitting light, I mean ...

If dark matter only interacts via gravity, how is detection of a dark matter particle proposed? Don't current particle detectors rely on the other (non-gravitational) interactions?

I just read that our galaxy's dark matter halo is estimated to be 1.5m ly across, compared to the visible galaxy's 100k ly across, needed to explain stellar rotation curves. Why would this be? By ...

I've read other Q's on dark matter/black holes, but none seem to be technically specific enough to clarify this point. I understand so far, that because classic CDM doesn't interact in ways that ...

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