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RE: Defining time with atomic fountains
I have a question related to time. If our universe was a box with a lot of particles (in thermal equilibrium), does that imply it is meaningless to have a concept of time in this system? So in other words, is time a concept tied to the nature of the system?
Except at the big bang itself, time (actually spacetime) is always well defined. If we take a system that is a box (even if it does not match our universe), why could not time be defined in there?
OK. I have heard about ENTROPY AS AN ARROW OF TIME. In the particles box (equilibrium state), isn't the entropy kinda saturated?
Entropy increases or stay constant with time, this is true. But this does not influence how time passes by.