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In his answer to a former question @IoannisPaizis presents a quote of Heisenberg from his book Physics and Philosophy

The atoms or elementary particles themselves are not as real; they form a world of potentialities or possibilities rather than one of things or facts.

The context of the quote makes it clear, that Heisenberg discriminates between

  • on one hand, the one reality when we force the microworld by an experiment to create a phenomenon,
  • and on the other hand, the world of undisturbed elementary particles, which is a collection of possible worlds according to the tendencies and possibilities described by quantum mechanics.

This view prompts the questions: Is the latter world, i.e. microphysics when it is not observed or - stronger - when it is not prepared by experiments, an example of possible worlds in the sense of Leibniz?

Corollary: The concept of a necessary event is a concept which gets its meaning from framing the event by Leibniz’ possible-worlds model. An event is necessary if it happens in all possible worlds.

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