Can indirect searches for DM provide insights into candidate particles?

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In summary: No, you can't distinguish between them directly, but you have knowledge about which energy scale to look at for direct searches.
  • #1
ChrisVer
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In general, the indirect searches for DM consist of looking at a burst of rays coming from somewhere in the Universe.
Is that correct? Is there any other way?

However, I am not sure how can someone , after seeing such a burst, decide whether it comes from candidate X (let's say neutralino) or candidate Y (let's say axion). Also how are we looking at such a thing [devices/physics]?
 
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  • #2
Axions have very low masses, while neutralinos have much higher masses. So axions won't show up in high-energy particle detections but neutralinos (or any other thermally-produced dark matter particle) will.
 
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I guess then I should have said some other heavy candidate ,my bad for choosing axions, could I ask the same for sterile neutrinos?
Or is it that you can't distinguish between them, but you have the knowledge then at which energy scale to look into the laboratory [for direct searches]?
 
  • #4
ChrisVer said:
In general, the indirect searches for DM consist of looking at a burst of rays coming from somewhere in the Universe.
Is that correct? I

No. Some of these detectors aren't even directional.
 
  • #5
Vanadium 50 said:
No. Some of these detectors aren't even directional.

Meaning? I didn't mean at a specific direction...
 
  • #6
ChrisVer said:
I guess then I should have said some other heavy candidate ,my bad for choosing axions, could I ask the same for sterile neutrinos?
Or is it that you can't distinguish between them, but you have the knowledge then at which energy scale to look into the laboratory [for direct searches]?
Well, basically the main thing that you'd get is a small piece of the whole picture. The main questions to be answered are:
1. What is the mass of the dark matter particle?
2. What does it decay into?
3. What are its interactions with other matter?

Any observation of dark matter helps to narrow the parameter space available. The ratio of dark matter to normal matter combined with the observation that it's relatively low in temperature give constraints on these quantities, and getting even a little bit of other data would dramatically limit the available options.
 
  • #7
In general I am trying to write/suggest 2 experimental (1 direct and 1 indirect) ways to search for Dark Matter.
I'm pretty sure about the direct searches, and how to explain them, for almost every popular DM candidate...
However I feel kind of "weak" when it comes to indirect searches.

My idea was to take some particular particle, let's say axions. For the direct searches, the microwave cavities are the most renowned ways for looking into cosmological axions, with which you can look at the open axion-window and get their mass and virial velocity dispersion. Such a signal would be the discovery of the axion.
However the axion can also give photons through the coupling to 2 gammas. So if the axion appears to have (let's say) [itex]m_a \approx 0.1 ~ meV[/itex] would we see a gamma rays coming from some "dark" region with [itex]E_\gamma \approx 0.05 ~meV[/itex] ? But isn't that like direct seeing the axion decay?
 
  • #8
A photon with 0.1meV of energy would have a wavelength of a little more than 1cm. This is just a bit higher in frequency than the peak frequency of the CMB. Photons of this energy would probably be drowned out by the incredibly bright CMB.
 

FAQ: Can indirect searches for DM provide insights into candidate particles?

1. What is "Indirect searches for DM"?

Indirect searches for DM refer to methods used to detect and study dark matter particles indirectly, rather than detecting them directly. This involves observing the effects of dark matter on other particles or phenomena, such as the movement of stars or the radiation produced by dark matter annihilation.

2. How do scientists perform indirect searches for DM?

There are several different methods used in indirect searches for DM, including measuring the distribution and movement of stars and galaxies, observing the radiation produced by dark matter interactions, and studying the cosmic microwave background. Scientists also use theoretical models and simulations to help guide their search for dark matter.

3. What are some current techniques being used in indirect searches for DM?

Some current techniques used in indirect searches for DM include gravitational lensing, which measures the bending of light caused by the presence of dark matter, and gamma-ray telescopes, which detect the high-energy radiation produced by dark matter annihilation. Researchers are also using data from particle accelerators and underground experiments to search for signals of dark matter interactions.

4. What are the challenges in indirect searches for DM?

One of the main challenges in indirect searches for DM is that dark matter particles are extremely elusive and difficult to detect. They interact very weakly with other particles, making it challenging to observe their effects. Additionally, there are many competing theories about the nature of dark matter, which makes it difficult to narrow down the search.

5. What are the implications of indirect searches for DM?

Indirect searches for DM have the potential to greatly advance our understanding of the universe and the fundamental particles that make it up. If successful, they could help confirm the existence of dark matter and provide valuable insights into its properties and role in the formation of galaxies and large-scale structure in the universe. This could also have implications for our understanding of gravity and the laws of physics.

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