If you combine all 3 branches of physics + math, the simulation becomes obvious.
1: Basic old shcool
Lets start with the oldest and most basic. The atom. It's almost completely void. Some say the protons, neutrons and electrons are solely energy. Positive in the middle, negatives sourrounding it, and vast vast empty space between them. The atom is hollow. The atom is pure information. The total of all mass in the universe combined, is the size of a marble. Estimated! (Maybe it's less. Maybe none. Maybe only when needed?)
2: String theory
String theory equations tells us 3 imporant things:
A: The universe is holographic. At the edge of the universe, all events from within are displayed in holograms. (Might as well call it a monitor.)
B: Buried inside the equations are genuine computercodes, that corrects errors in graphics.
C: Ten dimensions is what string theory tells us there are. In a 5th dimension, our universe would just be a single point. Or maybe a singe unit. A single computer.
3: Quantum mechanics
Quantum mechanics shows us that reality (matter) adapts to us. We (the observers) turn potential matter into solid matter, just by observing (sensing). It's the most proven fact in physics. We do!
4: Math
Math tells us that we either live in a multiverse or a zero-verse. Most likely the latter.