  We have calculated the non-linear effects of generic fermionic and bosonic
hot dark matter components in cosmological N-body simulations. For sub-eV
masses, the non-linear power spectrum suppression caused by thermal
free-streaming resembles the one seen for massive neutrinos, whereas for masses
larger than 1eV, the non-linear relative suppression of power is smaller than
in linear theory. We furthermore find that in the non-linear regime, one can
map fermionic to bosonic models by performing a simple transformation.
