Is there any reason the Universe must have a wave function?

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Discussion Overview

The discussion centers around the question of whether the universe must have a wave function, exploring the implications of quantum mechanics on a cosmological scale. Participants debate the necessity of a wave function for the universe, considering theoretical frameworks and interpretations of quantum mechanics.

Discussion Character

  • Debate/contested

Main Points Raised

  • Some participants argue that an isolated physical system, such as a particle-in-a-box, has a wave function, and by extension, the universe, as an isolated system, should also possess a wave function.
  • Others suggest that the applicability of quantum mechanics to the universe is a critical factor in determining whether it must have a wave function.
  • A participant expresses concern that decoherence may invalidate the argument for a wave function in macroscopic systems, indicating a potential limitation in the reasoning presented.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus, with multiple competing views on the necessity of a wave function for the universe remaining unresolved.

Contextual Notes

Limitations include the dependence on interpretations of quantum mechanics and the implications of decoherence for macroscopic systems, which are not fully explored in the discussion.

C Rob
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I believe it does, but I'm having a debate with someone and I'm trying to prove why the universe must have a wave function. I was under impression the best equations for describing our universe involve it having it's own wave but he's asserting it doesn't need one. Can anyone help me?
 
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An isolated physical system will have a wavefunction. So particle-in-a-box has a wavefunction. Now make it two-particles-in-a-box. The wavefunction of that system is distinct from that of the first system. Same goes for many-particles-a-box; distinct wavefunction from that of the previous two systems. Now let our isolated system be the universe. Therefore, by the same reasoning, the universe has a wavefunction.

Disclaimer: I feel that decoherence makes the above argument invalid for macroscopic systems. Maybe someone else can shed some more light on this.
 
C Rob said:
I believe it does, but I'm having a debate with someone and I'm trying to prove why the universe must have a wave function. I was under impression the best equations for describing our universe involve it having it's own wave but he's asserting it doesn't need one. Can anyone help me?

That depends on whether you think quantum mechanics is applicable to the universe or not.
 
The title of this thread is that same as the title of a thread in the Beyond the Standard Model forum. I have locked the thread here, and I have copied the posts in the thread here into the thread there. Any replies should be made there.
 
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