Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-10-15
Mon.Not.Roy.Astron.Soc. 358 (2005) 1076-1082
Astronomy and Astrophysics
Astrophysics
7 pages, 8 figures, Accepted for publication in the MNRAS
Scientific paper
10.1111/j.1365-2966.2005.08858.x
N-Body simulations are a very important tool in the study of formation of large scale structures. Much of the progress in understanding the physics of high redshift universe and comparison with observations would not have been possible without N-Body simulations. Given the importance of this tool, it is essential to understand its limitations as ignoring the limitations can easily lead to interesting but unreliable results. In this paper we study the limitations arising out of the finite size of simulation volume. This finite size implies that modes larger than the size of the simulation volume are ignored and a truncated power spectrum is simulated. If the simulation volume is large enough then the mass in collapsed haloes expected from the full power spectrum and from the truncated power spectrum should match. We propose a quantitative measure based on this approach that allows us to compute the minimum box size for an N-Body simulation. We find that the required box size for simulations of LCDM model at high redshifts is much larger than is typically used. We can also use this approach to quantify the effect of perturbations at large scales for power law models and we find that if we fix the scale of non-linearity, the required box size becomes very large as the index becomes small. The appropriate box size computed using this approach is also an appropriate choice for the transition scale when tools like MAP (Tormen and Bertschinger, 1996) that add the contribution of the missing power are used.
Bagla Jasjeet S.
Ray Suryadeep
No associations
LandOfFree
Comments on the size of the simulation box 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 Comments on the size of the simulation box in cosmological N-Body simulations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Comments on the size of the simulation box in cosmological N-Body simulations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-289516