cosmoboy
Nov7-04, 01:06 AM
Hi,
Could some body please explain me how to identfy the size of simulation box in cosmological n-body simulation with the physical scales in the universe. For example if I am using 128 grid points along one direction in a Particle Mesh code and total number of particles are 128*128*1228. Now there are two options, first is; we equate the density of particles in simulation box and compare it with the actual density of galaxies in the universe (for simulating galaxy clustering)
and second, we find the size of a spherical region at z=0, in which density fluctuatios are of the order of unity and identify it with
8 Mpc (Using COBE normalization, CDM spectrum).
Let me know if anyone has the answer
Could some body please explain me how to identfy the size of simulation box in cosmological n-body simulation with the physical scales in the universe. For example if I am using 128 grid points along one direction in a Particle Mesh code and total number of particles are 128*128*1228. Now there are two options, first is; we equate the density of particles in simulation box and compare it with the actual density of galaxies in the universe (for simulating galaxy clustering)
and second, we find the size of a spherical region at z=0, in which density fluctuatios are of the order of unity and identify it with
8 Mpc (Using COBE normalization, CDM spectrum).
Let me know if anyone has the answer