One of the leading theories for how the universe evolved after the Big Bang is the Cold Dark Matter Theory (CDM). This theory proposes that chilly dark matter moved slowly in the early universe, allowing matter to clump together to form the clusters of galaxies that we see, instead of matter being distributed evenly [...]

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It seems that it should be exceedingly difficult to enhance the modeling of dark matter without some reality check on the models results. How do they check the validity of whatever models they use? No matter how super the super computer is, the software will be deterministic.

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For those inclined to oppose human meddling with the structure of the universe or the composition and configuration of objects and groups of objects within the universe, consider:
Whether there is a limit to the magnitude of a modulation of chaos below which order remains invariant? Or, is order but a fiction invented by perspectives applied over finite, however large, time intervals?

And it says:
Is this really true? No-one knows what dark matter is, how it behaves (except gravitationally) ... but it´s known that its particles (!?) can annihilate each other!
So, WIMPs are (massive) photons? Because they are their own anti-particles? Never heard of anti-WIMPs.

I´m totally confused

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If everyone had even a basic grasp of scientific principles, this planet would be a better place (Phil Plait)

Die Lücke, die wir hinterlassen, ersetzt uns vollkommen (Carl Heinz Schroth)

1 + e^i*pi = 0

dhd40,

WIMP = Weakly Interacting Massive Particle (not Photon).

It's an acronym for theories describing subatomic particles which might be responsible for the gravitational effects that are seen: They would have to be Massive in order to generate the observed gravitational effects. They Interact Weakly because the only interaction that is currently observed is their gravity. (This is not to be confused with the Weak Interaction. That's the name of a specific type of interaction which has been detected happening between certain types of subatomic particles.)

If such subatomic particles exist and are describable by the same physics theory which is currently used to describe the known subatomic particles, then they'll be particles which have corresponding anti-particles When the two come into contact, they'll destroy one another, releasing photons corresponding to their mass. That's the case for all currently known particles. If this doesn't happen, then they don't exist (and thus dark matter doesn't consist of WIMPs) or they aren't describable by current theories.

Does this clarify things at all?

Fully agreed!
Therefore, there should be anti-WIMPs. But I´ve never heard of anti-WIMPs, and they don´t mention anti-WIMPs. They just talk about WIMPs annihilating eachother.
Maybe, their wording is a little bit scetchy?

__________________
If everyone had even a basic grasp of scientific principles, this planet would be a better place (Phil Plait)

Die Lücke, die wir hinterlassen, ersetzt uns vollkommen (Carl Heinz Schroth)

1 + e^i*pi = 0

While we don't know what the Dark Matter particles are yet, one specific model is that they are the lightest Supersymmetric particle (the neutralino). If so, then it would be its own anti-particle, and would give off high energy gamma-rays of some characteristic energy when they annihilate.

This energy is too high for the Gamma Ray telescopes we've had in orbit so far to detect, but MIGHT be in a range that GLAST can observe (note that the energy is too low for them to be detected by the ground-based cascade instruments (like MAGIC).

Note that there is also some chance that Supersymmetric particles will be observed by the LHC. Not all of these will be dark, since some can carry electric charge and color charge.

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Forming opinions as we speak

I thought the lightest supersymmetric particle is the photon

If so, then I wouldn´t have any problem with WIMP-annihilation

__________________
If everyone had even a basic grasp of scientific principles, this planet would be a better place (Phil Plait)

Die Lücke, die wir hinterlassen, ersetzt uns vollkommen (Carl Heinz Schroth)

1 + e^i*pi = 0