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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“A puff of wind, a puff faint and tepid and laden with strange odours of blossoms, of aromatic wood, comes out the still night—the first sigh of the East on my face. That I can never forget. It was impalpable and enslaving, like a charm, like a whispered promise of mysterious delight.... The mysterious East faced me, perfumed like a flower, silent like death, dark like a grave.”
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