## Are we living in a simulated universe? - Part 2

THEY ARE SERIOUSLY ASKING:

Are we living in a simulated universe?

By Bradley Bartholomew

February 2014

There is a basic concept in experimental physics called Lorentz symmetry. Essentially the experimental results should not reflect the orientation or framework of the experimental apparatus. Using a cubic space-time lattice to simulate electrons and muons at some point it is necessary to introduce a specific operator into the equations which will fine tune away the ‘lattice spacing’ artifacts. This operator has to do with recovering Lorentz symmetry in the lattice calculations. As the lattice spacing vanishes when compared with the scales of the system however, the Lorentz symmetry is recovered without the necessity of introducing this operator. They therefore calculate an approximate upper bound on the lattice spacing, below which the artifacts will not be observed. So they conclude that this breaking of rotational symmetry, if they were to observe it out there in the real physical world “would be a solid indicator of an underlying space-time grid, although not the only one.” They go on to point out that “another scenario that gives rise to rotational invariance violation involves the introduction of an external background with a preferred direction”.