Michio Kaku agrees with Einstein that time is a river.
Breakthrough physicist Michio Kaku ~ a developer of string field theory, often called the “theory of everything” ~ believes some phenomena previously found only in science fiction is nearing science fact.
In his new book Physics of the Impossible, Dr. Kaku explores time travel, invisibility cloaks and teleportation, among other familiar tools of science fiction. His conclusion: "A lot of the predictions made by science fiction writers have been replaced by the march of science."
"Time travel is definitely on the table, and in principle it may be possible to build a time machine," Dr Kaku tells BBC World Service."So, if one day somebody knocks on your door and claims to be your great-great-great-grand-daughter, don't slam the door." According to the BBC article:
There is a logical problem though with time travel, one that offers rich pickings for films and books. It is known as the "grandfather paradox" and asks what would happen if a time traveller were to kill their grandfather and therefore prevent themselves from being born.
If the time traveller was not born, how would they travel back in time?Dr Kaku has a solution.While he agrees with Einstein that time is a river, he says we now realise that the river of time can have whirlpools and fork into two rivers. In one of these forks, in another parallel universe, a different history can exist, but the past can never be altered.
"You cannot alter your own past. You cannot go back in time and kill your own parents before you were born. Your timeline is intact."
According to Dr Kaku, most of what we see on the silver screen is possible - it is just a question of time.
Click here for the complete BBC article.