DO NOT USE SCIENCE TO JUSTIFY UNSCIENTIFIC HYPOTHESES
If you try to use science in a hypothesis, your assertions must be scientifically plausible.
The existence of ghosts has never been scientifically shown. It implies a distinction between "mind/spirit" and "body" which requires something non-physical.
Science requires determinism, i.e. all actions are caused by previous physical actions. Nothing outside of the physical world can influence the physical world, so a mind/spirit cannot interact with the physical world. Therefore, ghosts do not exist as when someone dies, their physical body is destroyed and that's it.
I really hate when people use abstract scientific theories involving the words "quantum" and "string" to justify absurd (or at least never demonstrated scientifically) conclusions. The "science" you base it on is one of many thousands of theoretical interpretations.
The theories you mention are a) twisted versions of mathematically not observationally based and are likely never to happen in the real world and b) Sci-fi. "Oh no, the overlapping strings in the tenth dimension are breaching the hull, captain!"
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