Effects of Massive Neutrinos and Dynamical Dark Energy on the Cluster
  Mass Function
  The presence of massive neutrinos affects the growth of large-scale structure
in the universe, leaving a potentially observable imprint on the abundance and
properties of massive dark matter-dominated halos. Cosmological surveys detect
large numbers of these halos in the form of rich groups and clusters, using the
information as an input to constraining the properties of dark energy. We use a
suite of N-body simulations that include the effects of massive neutrinos as
well as of dynamical dark energy to study the properties of the mass function.
As in our previous work, we follow an approach valid at low neutrino mass,
where the neutrino overdensities are assumed to be too small to act as a
significant nonlinear source term for gravity. We study how well a universal
form for the halo mass function describes our numerical results, finding that
the use of an appropriate linear power spectrum within the formalism yields a
good match to the simulation results, correctly accounting for the (neutrino
mass-dependent) suppression of the mass function.
