hot dark matter
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hot dark matterDark matter that consists of particles moving at speeds near to the speed of light. Since neutrinos have nonzero masses it is thought that they may contribute much of the hot dark matter in the Universe.
hot dark matter[¦hät ¦därk ′mad·ər]
A hypothetical type of dark matter consisting of entities that were not in thermal equilibrium in the early universe; possibilities include massive neutrinos and cosmic strings.