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- TL;DR Summary
- Arrow of time and Entropy

My understanding is that a sub atomic particle has no arrow of time. Clearly the Arrow of time as understood in our macroscopic world has one direction. Entropy being an arrow in the direction toward uniform distribution of the individual and or sums of all the forms of energy in a system and , I suppose ultimately the uniform distribution of a final form of energy, begs a number of questions.

Starting from Hot Dense and Smooth at the beginning of the universe: where in physics is the convergence of the notion of Entropy and the Arrow of time?

Or put another way: assuming uniformity, where in the subatomic/nuclear/atomic scale is the “line in the sand” where Entropy has no arrow of time? ( Quarks and Gluons, Nucleons, Plasma, Atoms, Molecules?)

If that could be answered, then was there a point in the early universe before which (and the use of the word “before” is sysyphean so no need to comment) the notion of entropy is an incorrect or confusing way of referencing the early universe?

Is this “Sub Atomic Frame” fixed regardless of what model of the universe one holds with? (Inflation, Multi universe, eternal inflation, etc) Or does the Subatomic Line in the sand “smear or blur” depending.

Matt

Starting from Hot Dense and Smooth at the beginning of the universe: where in physics is the convergence of the notion of Entropy and the Arrow of time?

Or put another way: assuming uniformity, where in the subatomic/nuclear/atomic scale is the “line in the sand” where Entropy has no arrow of time? ( Quarks and Gluons, Nucleons, Plasma, Atoms, Molecules?)

If that could be answered, then was there a point in the early universe before which (and the use of the word “before” is sysyphean so no need to comment) the notion of entropy is an incorrect or confusing way of referencing the early universe?

Is this “Sub Atomic Frame” fixed regardless of what model of the universe one holds with? (Inflation, Multi universe, eternal inflation, etc) Or does the Subatomic Line in the sand “smear or blur” depending.

Matt