this post was submitted on 12 Jul 2023
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Never said anything about it not existing. From what I understood, a particle that’s not interacting with an outside force stays in superposition by default. The universe was supposedly a single particle at the moment of the Big Bang, thus it stands to reason that it would have been in superposition if it couldn’t interact with anything else.
If you trace back the cosmological evolution of our universe you'd get a "singularity", that is not the same thing as being a single particle. Even the physical existence of a singular point at the beginning is not accurate. A singularity in physics is a mathematical artefact signaling the breakdown of the descriptive power of the theory you are using. The common example is the singular behaviour of the electric field around a charged particle in classical electrodynamics, the singularity is a signal that you'd need to switch to quantum electrodynamics to describe the physics close to a charged particle. Similarly with cosmology: close to the beginning we have a singularity that signals the breakdown of the descriptive power of our theories, and we need to switch. What we would switch to we call a " quantum gravity theory", but we are not yet sure what that theory is.
I see what you mean, but if this is possible, then I don’t see why not the entire universe as a whole near T≈0.
If you don't see why it's impossible, then you don't understand it. You can't just lump together all the "quantum" ideas because they sound cool.
Notice that the particles in your article were "super-chilled". That's the exact opposite of the early universe.
So you’re saying it’s absolutely, 100% impossible that the universe in its entirety was/is in superposition at any one point?