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Researchers speculate that time travel can occur within a kind of feedback loop where backwards movement is possible, but only in a way that is "complementary" to the present.
In other words, you can pop back in time and have a look around, but you cannot do anything that will alter the present you left behind.
The new model, which uses the laws of quantum mechanics, gets rid of the famous paradox surrounding time travel.
If we don't know your father is alive right now - if there is only a 90% chance that he is alive right now, then there is a chance that you can go back and kill him.
But if you know he is alive, there is no chance you can kill him.
You go back to kill your father, but you'd arrive after he'd left the room, you wouldn't find him, or you'd change your mind," said Professor Greenberger.
You wouldn't be able to kill him because the very fact that he is alive today is going to conspire against you so that you'll never end up taking that path leads you to killing him.
Originally posted by Jeremiah25
So you see, any 'ghosts' in this scenario would be quite solid, tangible human beings. They would simply be limited in their actions as a result of quirky quantum laws.
I still like the essential core of your theory. I believe that there may be some merit to the concept of ghosts being a visible example of some kind of overlap between different dimensions. How one would go about proving or disproving this, I have no idea.
Originally posted by plop
Also, when u read near-death-experiences, people often tell that there is no time in the afterlife. And some even mention that they can see 1000 years in the future and in the past. So in this case it would mean that ghosts exist in a timeless place, so even if they travelled to the present, they would already have knowledge of what happened 1000 years in the future, so for ghosts this theory would not just apply to the past, but to all of time.
There should be some kind of experiment that can test this.