In astrophysics self-interacting dark matter is a hypothetical form of dark matter consisting of particles with strong self-interactions. This type of dark matter was postulated to resolve a number of conflicts between observations and simulations on the galactic scale and smaller. Self-interacting dark matter has also been postulated as an explanation for the DAMA annual modulation signal.
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“O conspiracy,
Sham’st thou to show thy dang’rous brow by night,
When evils are most free? O then, by day
Where wilt thou find a cavern dark enough
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