Dark Matter - could be warm
Dark matter may be made of fast, lightweight particles, according to a new computer simulation. That could explain the peculiarly pure chemical makeup of some stars in the Milky Way, and the enormous mass of black holes that live at the hearts of large galaxies.
Because 'dark matter' reveals itself only by its gravity, astronomers have few clues to its nature. The most popular model is cold dark matter: heavy subatomic particles that tend to move very slowly.
Another possibility is warm dark matter: lighter particles that move faster. The rapid motion of these particles smoothes out the small dense knots of matter that would could or should otherwise form in the cores of galaxies, and there are hints that such dense knots are indeed missing.
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In the simulation, researchers assumed a dark matter particle with just 0.6% of the mass of an electron. That would fit the gravitino, a particle predicted by the speculative theory called - supersymmetry – although any particle as light would have a similar effect.
Did our galaxy's black hole eat its baby brother? @ SNS
Small 'Hobbit' Galaxies Made Almost Entirely of Dark Matter
Explanation of Dark Matter Might Lie in Origin of Stars @ Live Science