Discreteness effects in cosmological N-body simulations

Astronomy and Astrophysics – Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

10 pages submitted to MNRAS

Scientific paper

10.1111/j.1365-2966.2004.07699.x

An estimate of the convergence radius of a simulated CDM halo is obtained under the assumption that the peak phase-space density in the system is set by discreteness effects that operate prior to relaxation. The predicted convergence radii are approximately a factor 2 larger than those estimated for numerical convergence studies. A toy model is used to study the formation of sheets of the cosmic web, from which DM haloes form later. This model demonstrates the interplay between phase mixing and violent relaxation that must also be characteristic of spherical collapse. In the limit that sheets contain arbitrarily many particles, it seems that power-law profiles are established in both distance and energy. When only a finite number of particles is employed, relaxation is prematurely terminated and the power laws are broken. In a given simulation, the sheets with the highest peak phase-space densities are those that form from the longest waves. Hence simulations with little small-scale power are expected to form the cuspiest haloes.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Discreteness effects in cosmological N-body simulations 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 Discreteness effects in cosmological N-body simulations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Discreteness effects in cosmological N-body simulations will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-519039

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.