According to Stephen Hawking history has to be consistant, therefore not changable and time travel impossible. However, we should ask here, what history is at all. The history as we know it is just a converted presence into a form that can be pushed forward into future. And as I have shown, we wouldn't find the history we know if we could travel in time at all.
A voyage to the future or the past can be very dangerous for the presence. The increase in speed of the object traveling would cause an increase in 'mass' and the appropriate increase in 'space curvature'. This could cause huge damage to neighboring space particles. Such voyage could be induced through a creation of a temporary time flux (gravitational cell) in the future or the past to move the object to the future or the past. This procedure can also be to decrease the 'mass' of an object. By placing a temporary time flux to the future at the position of the object, the normal object's time flux to the past would be slowed down. By placing it to the past, the object would become 'heavier' and could be used as a kind of propulsion. A temporary time flux in the past could be produced by a fast disintergrating particle with a very short half-life.
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