Are the "ghosts" that individuals perceive merely extradimensional people?

[Mephistopheles]

I recently watched a PBS documentary on theoretical physics in which a professor argued that there are an infinite number of parallel universes, each containing a copy of ourselves. The differences between us and our copies in the parallel universes can either be slight or drastic. The professor said that the reason we don't perceive the parallel universes is because they are in other dimensions. So, if we take the professor's premise to be true, then might that not be a plausible explanation for ghosts? Perhaps an energy anomaly enables people to interact with people from another dimension at times.

[Dr.Dog]

I recently watched a PBS documentary on theoretical physics in which a professor argued that there are an infinite number of parallel universes, each containing a copy of ourselves. The differences between us and our copies in the parallel universes can either be slight or drastic. The professor said that the reason we don't perceive the parallel universes is because they are in other dimensions. So, if we take the professor's premise to be true, then might that not be a plausible explanation for ghosts? Perhaps an energy anomaly enables people to interact with people from another dimension at times.

I disagree.  One of the most vivid times I saw a ghost is my friend who was murdered, who came to visit me before anybody even found out that he was dead, as a ghost (essentially he came to visit me before he left this realm behind).  On top of that, during my astral projections I have seen plenty of ghosts wandering around. 

[Mightily Oats]

I always kind of figured that "ghosts" are just the electromagnetic energy of deceased people that just sort of floats around.

Energy can't be destroyed, right?

And most paranormal activity seems to involve metal in some way.

Hinges on doors, creaking in floor boards (nails, anyone?) that sort of thing.

[Khellendros]

I always kind of figured that "ghosts" are just the electromagnetic energy of deceased people that just sort of floats around.

That makes the most sens to me as well. If these experiences are real, it could just be that some people leave a sort of strange imprint behind that we can't yet identify or understand.

[TheGreEness327]

I disagree.  One of the most vivid times I saw a ghost is my friend who was murdered, who came to visit me before anybody even found out that he was dead, as a ghost (essentially he came to visit me before he left this realm behind).  On top of that, during my astral projections I have seen plenty of ghosts wandering around. 

...

[AP]

I always kind of figured that "ghosts" are just the electromagnetic energy of deceased people that just sort of floats around.

Why am I not surprised you would have this theory?

[Rynox]

On top of that, during my astral projections I have seen plenty of ghosts wandering around. 

Wait wat?