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So if, when t = 0, you are located at x = 0, the limiting velocity c forbids you to reach the position x = 1 (or x = -1) until the clock reaches t = 1 s. Isn't it confinement ?

And, if it is , according to quantum mechanics, confinement implies discretization of the energy spectrum.

I ask then:

Does this relativity postulate imply quantum discretization of energy spectrum of all massive entities?