People have done simulations with quad precision (very slow) but very few terms in molecular dynamics would benefit from that. In fact, most variables in MD can be single precision, exceptt for certain terms like the virial.
If the universe is discrete, how does one voxel communicate to the neighboring voxel what to update without passage through ‘stuff in between’ that doesn’t exist? Heh
It seems physics is going the opposite way with infinite universes and multiple dimensions to smooth out this information transfer problem and make the discrete go away.
I don't think your "voxel" intuition can be right because it's a small jump from that to (re)introducing an absolute reference frame.
That kind of reminds me of the 'aether' that was once hypothesized as a medium of transmission for light and radio waves [0].
Also, voxel's communicating sounds an awful lot like a higher-dimensioned cellular automata.
How much smaller?
But photons resulting from the same event but with different energies arrive at detectors an appreciable distance away to all intents and purposes simultaneously, something that would not happen if spacetime were discrete at a level close to the Planck length. So it would have to be quite a big difference for an effect not to show up as a difference in time-of-flight.
What accounts for the expectation that they do not arrive simultaneously in a voxel-based universe?