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RE: Dark blobs as stealthy dark matter

in #steemstem • 6 years ago

Very good question. Thanks for asking!

The point is that the density of dark matter is well measured. Therefore, the more massive a single blob is, the smaller number of blobs is required to get the right relic density of dark matter. Consequently, the blob flow going through Earth is smaller.

For blobs lighter than 1000 tons, we are guaranteed to have a flow sufficient for having at least one of them going through us each year.

Does it clarify?

6 years ago in #steemstem by
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     6 years ago (edited)

    Ha ha unfortunately no it doesnt. What is 'relic density', and why does density have any bearing on the orbit?

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       6 years ago 

      This is explained in details in this post. In short:

      • In the early universe, dark matter particles could annihilate into Standard Model particles and vice versa, dark matter could be produced from Standard Model particles.
      • After a while, the universe cooled down and the Standard Model particles were not able anymore to produce dark matter anymore. The density of dark matter therefore went down (dark matter annihilation was still ongoing).
      • Even a bit further, the universe has expanded too much so that dark matter annihilation was not possible anymore (there was no way for dark matter particles to meet each other). As a result, the density of dark matter freezed out. This density is still what we have today.

      Now dark matter is spread all over the universe and dark matter particles can go through Earth. Those are the ones that one tries to detect.

      Hopefully, now it will be slightly clearer ;)

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