The wave-function is not a material entity

What is it about?

If the wave-function is material, and it is a scalar field then quantum mechanics is irreversible in time. Since symmetries are important, then the wave-function is not material.

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Why is it important?

If one believes that scientific theories inform us about the nature of reality, then one has to figure out what they tell us about it. I argue that we should not look at the wave function for an image of the world.