@MrMind. Indeed, in a later edit I pointed out that a more realistic simulation would allow for the creation of multiple new civilizations at a time step.
However, your suggestion of modelling the geometry of the universe as a 4d sphere is not only relevant, but also easy to implement. I am not so sure how to handle the expansion. I admit to being rusty on my cosmology.
@MrMind. Indeed, in a later edit I pointed out that a more realistic simulation would allow for the creation of multiple new civilizations at a time step.
However, your suggestion of modelling the geometry of the universe as a 4d sphere is not only relevant, but also easy to implement. I am not so sure how to handle the expansion. I admit to being rusty on my cosmology.