So, I am reading this paper on the physicality of the wave function and I have a question.(adsbygoogle = window.adsbygoogle || []).push({});

Here's the passage:

"If the wave function is a physical field, then the mass and charge density will be distributed in space simultaneously for a charged quantum system, and thus, there will exist gravitational and electrostatic self-interactions of its wave function. This not only violates the superposition principle of quantum mechanics but also contradicts experimental observations."

How would this violate the superposition principle?

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# Gravitational/Electrostatic self-interactions of wave function

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