Our Universe is not a computer simulation. It's far too complex.

Do gravitational anomalies prove we're not living in a computer simulation?

Is our entire universe just a computer simulation? Theoretical physicists believe they've found proof that our universe is far too complex to be captured in any simulation. According to the researchers, the hypothesis is done in by gravitational anomalies, tiny "twists" in the fabric of spacetime.

 From article, (Is our entire universe just a computer simulation? 

now theoretical physicists believe they've found proof that our universe is far too complex to be captured in any simulation. According to the researchers, the hypothesis is done in by gravitational anomalies, tiny "twists" in the fabric of spacetime.
These anomalies have been known to exist for decades, but are notoriously difficult to directly detect. Effectively representing twists in spacetime, they arise in physical systems where magnetic fields generate energy currents that cut across temperature gradients, particularly in cases where high magnetic fields and very low temperatures are involved.
Monte-Carlo simulations are used in a wide variety of fields, from finance to manufacturing to research, to assess the risks and likely outcomes of a given situation. They can process a huge range of factors at once and simulate the most extreme best- and worst-case scenarios, as well as all possibilities in between.

Quantum Monte-Carlo simulations are used to model quantum systems, but the Oxford and Hebrew scientists found that quantum systems containing gravitational anomalies are far too complex to ever be simulated. The quantities involved in the simulation will acquire a negative sign – essentially, there's an infinite number of possibilities, so the simulation can't possibly consider them all.

Pushing it further, the team says that as a simulated system gets more complex, the computational resources – processors, memory, etc – required to run it need to advance at the same rate. That rate might be linear, meaning that every time the number of particles simulated is doubled, the required resources also double. Or it could be exponential, meaning that those resources have to double every time a single new particle is added to the system.

That means that simulating just a few hundred electrons would require a computer with a memory made up of more atoms than the universe contains. Considering our universe contains 1080 particles – that's a 10 followed by 80 zeroes – the number of atoms needed to simulate that is incomprehensible and utterly unsolvable.)

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