Re: Testing for a simulation
Here is one idea:
And a general audience version: http://www.phys.washington.edu/users/savage/Simulation/Universe/
TLDR: If we are living in a "beta" simulation, there are possible ways to find it out, and the paper proposes one way, by measuring ultra high energy cosmic rays, and check the direction of travel of the highest energy particles (near so-called GZK cut-off). The idea is that hypothetical simulation might reveal its symmetry if the highest energy particles are following a certain direction.
I am not a physicist, so I have no clue if this could work, or whether eventually detected phenomena can be explained with something else (most probably IMO).