I've been bumbling with a question recently. People postulate that with the give model of big ban, particles forms and breaks and eventually became what we saw as of today.
However, if we put quantum into the picture, the original universe seemed to be described by bunch of superposition of quantum states. But then in order for the universe to be "realized", there must be a point where such superposition and uncertainty starts to break down, either at cosmic scale or at very "small", as of a measurement.
Thus, what caused the first measurement that collapsed the universe into what one preserve as of today's? (is it the creation of photon or something else?)
Also, the photon carry the information of original universe. Dose that mean people, in the reference of earth, are still making the measurement to the universe and collapsing the universe? Or weather the universe has completely collapsed?(i.e. does this collapse happen at certain space, or happen to the universe at once.)
Another logic debate was that: could the first measurement happen inside the universe at all? (i.e. does this imply no causal model, or weather we need some non conservative process?)