The Direction of Time

The Direction of Time Image source: Tufts University -

Time moves on. Or so it seems. Does time have symmetry? Does it work both ways? The problem of time’s symmetry is simple: Physics’ laws work backwards just like they do forwards. They are inherently reversible. But we see a one-way street. We are swept along inexorably, so it seems. Why then do events go one way only? No one knows.

Time has an arrow: Eggs break; cars rust; rocks fall; never the reverse. One can soon see if a silent movie runs the wrong way. But the laws of physics cannot say which way the movie plays. It is a bitter pill. Physicists believe a good equation tells the truth, the whole truth, nothing but the truth. Contrary to their equations we go downstream. That our time flows in one direction is one of the most puzzling things about the universe that physics doesn’t understand. Feynman says: “There should be somewhere in the works some kind of principle that uxles only make wuxles, and never vice versa, and [this] would be the thing that makes the whole phenomena of the world seem to go one way. But we have not found this yet.”

Cosmologic has it that, as it begins, the cosmos has no time. Does it then choose a direction?