Universe and cosmos: look at them as a computer scene

Frankly I am not sure of my title and comments are wellcome!
But I am not kidding:

"In this work, we have taken seriously the possibility that our universe is a numerical simulation.
In particular, we have explored a number of observables that may reveal the underlying structure of a simulation performed with a rigid hyper-cubic space-time grid."


And they add eventually:

 

"Nevertheless, assuming that the universe is finite and therefore the resources of potential simulators are finite, then a volume containing a simulation will be finite and a lattice spacing must be non-zero, and therefore in principle there always remains the possibility for the simulated to discover the simulators."

For those with a good background in physics they said in the conclusion:




"A number of elements required for a simulation of our universe directly from the fundamental laws of physics have not yet been established, and we have assumed that they will, in fact, be developed at some point in the future; two important elements being an algorithm for simulating chiral gauge theories, and quantum gravity. It is interesting to note that in the simulation scenario, the fundamental energy scale defined by the lattice spacing can be orders of magnitude smaller than the Planck scale, in which case the conflict between quantum mechanics and gravity should be absent."


http://arxiv.org/pdf/1210.1847v2.pdf