Converting co-moving distances to physical distances

[bazkiaei]

The positions of particles in the simulations are co-moving distances. The code currently converts the view direction positions to the luminosity distances but it does not touch the positions in the plane of view. The difference between these two might be important so they should be converted to the physical distances.

[AnthonyHorton]

If you want to be a perfectionist about this you'd want to also take into account the cosmological correction to the distances perpendicular to the line of sight. For significant redshifts the observed angular size of an object is not exactly physical_size / distance_from_observer. Look up 'angular size redshift relation'.