by going faster then light we would not change dementions maybe we would relize the exestence of a forth demention. but use this little example. There is this type of animal that lives on the bottom of a fish tank. it cant see anything exsept what is in his light of sight, across one x axis there for y and z are unknows to him. We as humans can watch this little animal move around but to him he is still in 1d even through above him is move and to his right and his left there is more. He is in a 3d world with out knowing it. The same idea could be aplayed to humans we might live in a 4d wourld and not know it. maybe light its self is the 4th demention or maybe not.