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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“On the green they watched their sons
Playing till too dark to see,
As their fathers watched them once,
As my father once watched me;”
—Edmund Blunden (1896–1974)
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—E.B. (Elwyn Brooks)