I wanted to post an actual theory of time travel on this thread, but I didn't want to send the whole discussion to pseudo.
http://www.thescienceforum.com/time-30107t.php
Yeah. Our notion of time is tied very closely to our notion of entropy. At the highest level of entropy, like say a really hot gas or plasma, there would be no preferred direction for us to say time is flowing. Backwards and forwards are basically the same.Originally Posted by ecom131
So, to travel back in time, you would have to not know what was coming. The past would have to be a mystery to you the same as the future is a mystery to you. Otherwise the information contained in your body would be destroyed. All that low entropy energy that defines you and gives you order needs to be headed toward a high entropy destination.
Why does it need to be headed toward a high entropy destination? Because the flow of entropy is the constant that cannot be changed. The flow of time can be altered, but not the flow of entropy. And even at that, you're not sending mass back in time. Only information.
Oh, and then there's the problem of entropy being relative. If you know for a fact what tomorrows lottery numbers are going to be, then the lottery drawing is not a high entropy event to you. It's high entropy to everyone else, but not you.