(This is a question of information theory, data compression and entropy, so I believe it fits CS forum)
Does the fact that the computer itself is a part of the universe make it logically impossible for the computer to contain the information of the whole universe?
I want to know if it's possible to simulate the whole universe on a computer. This question is motivated by the hypothesis that we live in a simulation. If the answer to the question is negative, it means that a simulated universe inside another universe necessarily contains less information, so it's a smaller or less detailed universe.
By the "information of the whole universe" I mean the position and state of all the elementary particles in the universe.
By the "contained in a computer" I mean the information of the whole universe must be retrievable from the computer by a human (or a transcendent form of conscious mind).