Hello,
I believe that it will require three things to make time travel a possibility. I believe that it required three things to make the moon landing a reality and that these three things are needed to make time travel a reality. First I believe that math is essential. Second I believe that physics is a must. Most importantly though I believe that God must be willing for it to happen. However this is not uncommon for in order for you and I to breath our next breath requires three things. First, it requires math. Second it requires physics. But most importantly, it requires God's permission and command.
Best Regards,
Edwin G. Schasteen
Forgive me for making this a spiritual arguement but to me spirit and science are unified conscepts not counterdictory ones.