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Abstract
I address the question whether the wave function in quantum theory exists as a real quantity or not. For this purpose, I discuss the essentials of the quantum formalism and emphasize the central role of the superposition principle. I then explain the measurement problem and discuss the process of decoherence. Finally, I address the special features that the quantization of gravity brings into the game. From all of this I conclude that the wave function really exists, that is, it is a real feature of Nature.
Keywords decoherence  measurement problem  ontology  quantum formalism  quantum gravity  quantum mechanics  superposition principle  wave function
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References found in this work BETA

On the Interpretation of Measurement in Quantum Theory.H. D. Zeh - 1970 - Foundations of Physics 1 (1):69-76.
Quantum Gravity.Claus Kiefer - 2004 - Oxford University Press UK.

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