Question

1. Could dark matter be made of axions ?

2. What are the properties of dark matter ?


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Answer 1

1 They would be highly energetic and thus unlikely to be a dark matter component. Dark matter axions would have to be slow-moving, or cold, so they could clump together to gravitationally guide the evolution of galaxies—as dark matter is believed to do.

2 Dark matter is composed of particles that do not absorb, reflect, or emit light, so they cannot be detected by observing electromagnetic radiation. Dark matter is material that cannot be seen directly. We know that dark matter exists because of the effect it has on objects that we can observe directly.

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Answer 2

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1-Dark matter can refer to any substance which interacts predominantly via gravity with visible matter (e.g., stars and planets). Hence in principle it need not be composed of a new type of fundamental particle but could, at least in part, be made up of standard baryonic matter, such as protons or neutrons.

2-Here are the properties a potential dark matter particle must have:

1) It must be dark, or does not emit light.

2) It must interact through gravity.

3) It must interact with itself weakly.

4) It must be cold. It is not moving at very high speeds.

5) It must be stable.