I don’t know LLMs do that, but they are excellent function approximators, and the laws of physics which allow for my brain to be conscious also can be considered some function to approximate. If the LLM can approximate that function well enough, then simulated humans would truly believe in their own existence, as I do.
And it isn’t really important whether or not consciousness is part of the simulation or not, if the end result is the simulator is capable of emulating people to a greater extent.
Better just code up your simulator to run efficiently on a supercomputer!
Presumable, running a human simulation by brute forcing physics at a scale large enough to represent a human is completely infeasible, but we can maybe conceive how it would work. LLMs are an impressive engine for predicting “next” that is actually computationally feasible.
Behavior/dynamics depends on structure, and structure is scale dependent.
At the scale of galaxies and stars, the universe has a relatively simple structure, with relatively boring dynamics mostly governed by gravity and nuclear fusion.
When you zoom down to the level of dynamics on a planet full of life, or of a living entity such as a human, then things get a lot more interesting since at those scales there is far more structure causing a much greater variety of dynamics.
It's the structure of an LLM vs the structure of a human brain that makes the difference.