Question

hidden variable theory applied on entire universe

Answer 1

Hidden variable theory was introduced by some physicists because sometimes known variables can't give the complete description of the system. The hidden variables can be inaccessible to us and thus are non detectable.

In the universe there are many things which are not known to human beings such as dark matter, dark energy, black holes. These things are still mysterious and not understood completely yet. So, these things can contain some hidden variables. On the Earth also, there are a lot of things which are not understood yet completely. Egypt. Mapemba effect, it shows that the hot water freezes earlier than cold water ( temperature difference is not more than 20°C ) This effect is partially explained but not completely, so there can be some hidden variables.