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| • | Key points –
we are pretty darn certain it is |
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| present in
larger quantities than baryons. |
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| • | Can provide
the extra gravity, extra unseen |
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| perturbation,
to let galaxies grow from the |
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| small observed
temperature fluctuations. |
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| • | Unknown what
it is! Recall our previous class |
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| discussion
(chapter 2). |
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| • | Terminology
in this game describes “hot” and |
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| “cold” dark
matter, indicating whether or not |
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| particles are
relativistic when they decouple. |
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