In the case of a portal, two points, where one is passive (destination) and one active (origin), are connected by a \(F_\psi\) or \(E_\psi\) field, unchanging.
In the case of time travel, one single point is subjected to an abruptly changing \(F_\psi\) or \(E_\psi\) field.
Why did the Philadelphia Experiment both teleported and time travelled?
The associated fields changed abruptly when they switch off power after having traveled some distance and while traveling, two of them jumped off the ship. A sudden decrease in field ( \(F_\psi\) or \(E_\psi\)) pushed the two of them into the future.
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