The arrow of time is the "one-way direction" or "asymmetry" of time. The thermodynamic arrow of time is provided by the
second law of thermodynamics, which says that in an isolated system, entropy tends to increase with time. Entropy can be thought of as a measure of microscopic disorder; thus the second law implies that time is asymmetrical with respect to the amount of order in an isolated system: as a system advances through time, it becomes more statistically disordered. This asymmetry can be used empirically to distinguish between future and past, though measuring entropy does not accurately measure time. Also, in an open system, entropy can decrease with time.
With that in mind, let's presume here that the "
Universe is Not Expanding After All" (or may not be) and that no practical system can be truly "isolated" or "closed" in reality. Does entropy really force time to go one-way? What if the Universe began shrinking?
But it is without any doubt.
But is has to be.
Yes.
Then time would still be going forward.
Since things happen, and that is necessary for the structure of matter (the spinning of the electron and the vibration of quanta), then time can only go forward otherwise events would be undone making the fabric of space impossible.
You cannot violate the space time matrix yet still expect it to stand while events unravel. It doesn't work that way. Instead, the only option is to travel back along the timeline by skips and hops (a warp) with your own timeline and the places you skip to still moving forward as well while the actual net universal timeline itself never stops moving forward.
