The impact of massive neutrinos on the abundance of massive clusters

Details The impact of massive neutrinos on the abundance of massive clusters The impact of massive neutrinos on the abundance of massive clusters

2011-08-23

arxiv.org/abs/1108.4688v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

18 pages, 9 figuers, comments are welcome

Scientific paper

We study the spherical, top-hat collapse model for a mixed dark matter model including cold dark matter (CDM) and massive neutrinos of mass scales ranging from m_nu=0.05 to a few 0.1eV, the range of lower- and upper-bounds implied from the neutrino oscillation experiments and the cosmological constraints. To develop this model, we properly take into account relative differences between the density perturbation amplitudes of different components (radiation, baryon, CDM and neutrinos) around the top-hat CDM overdensity region assuming the adiabatic initial conditions. Furthermore, we solve the Boltzmann hierarchy equations to obtain time evolution of the neutrino perturbations including the effect of nonlinear gravitational potential in the late stage. We find that the presence of massive neutrinos slows down the collapse of CDM (plus baryon) overdensity, however, that the neutrinos cannot fully catch up with the the nonlinear CDM perturbation due to its large free-streaming velocity for the ranges of neutrino masses and halo masses we consider. We find that, just like CDM models, the collapse time of CDM overdensity is well monitored by the linear-theory extrapolated overdensity of CDM plus baryon perturbation, smoothed with a given halo mass scale, if taking into account the suppression effect of the massive neutrinos on the linear growth rate. Using these findings, we argue that the presence of massive neutrinos of mass scales 0.05 or 0.1eV may cause a significant decrease in the abundance of massive halos compared to the model without the massive neutrinos; e.g., by 25% or factor 2, respectively, for halos with 10^15Msun and at z=1.

Affiliated with

Also associated with

No associations

Rating

The impact of massive neutrinos on the abundance of massive clusters does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The impact of massive neutrinos on the abundance of massive clusters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The impact of massive neutrinos on the abundance of massive clusters will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-376863