### Halo Mass Function

(mass of distribution of dark matter)

A **Halo Mass Function** is a distribution function
(essentially an unnormalized Probability Density Function) mapping mass
to the quantity of Dark Matter Halos with that mass.
It is of use in Cosmology and cosmological simulations.

(*cosmology,dark matter,function,mass*)
http://en.wikipedia.org/wiki/Halo_mass_function

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