Physical foundations of time travels
The journey back in timea concept is where a shift forward or backward is in the dimension of time.
It must be added that some of the interpretations of the time travel They include the possibility of travel between parallel universes or different realities. To understand the concept of the time travel, or develop any related theory, should become familiar with the basics of the travel in time.
The principles on which sit the time travelthey have to do with proven physical laws to be able to derive possible theories and experiments that bring us closer to the achievement of such travel.