Arrow of time — 54 discussions

it is the change in entropy that ultimately provides us with the answer to why systems will naturally evolve in one direction with time and not the other: systems always evolve in time in such a way that the total entropy of system + environment increases. If you observe a system in which the...

"Arrow" of time, or "arrow" of memory? I need help understanding this. To me, it seems, well not to be over the top about it, but, well, pretty much ridiculous that there wouldn't be *the appearance* of an "arrow" of time that points in one and only one direction. Take the classic question of...

I got into a discussion about the "arrow of time" recently, and one point I brought up is that for a system governed by time-symmetric laws, if you place no special restrictions on the initial conditions but instead pick an initial state randomly from the system's entire phase space, you will be...

http://www.physorg.com/news1734.html An interesting article on the arrow of time and why it flows in only one direction.