  We systematically study the observable properties of dark-matter admixed
neutron stars, employing a realistic nuclear EOS in combination with
self-interacting fermionic dark matter respecting constraints on the
self-interaction cross section. Deviations from universal relations valid for
nucleonic neutron stars are analyzed over the whole parameter space of the
model and unequivocal signals for the presence of dark matter in neutron stars
are identified.
