Arrow of time Definition and 54 Threads

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.