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Does the big bang theory hold that there is a possibility that the whole of the observable universe came out from NOTHING? I mean if all of this universe was occupying an extremely small size of a Planck length, then it appears to be tempting that the universe before that was even smaller and smaller till we reach zero size. i.e. till we reach no universe. So the story of existence begins with nothing followed by the sudden emergence of the universe. Is that what the current big bang theory is claiming? Or is it an unsolved question?

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Here is the current Big Bang model, a cut in two space and one time dimension

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Note the fuzziness at the beginning , the Big Bang. Quantum mechanical behavior is introduced, so there is no longer a "point" for the Big Bang , but a probability locus, so no zero, as with all quantum mechanical states.

So it is not out of "nothing" but out of a probability locus.

Physicists expect that the underlying level of all classical theories is quantum mechanical, and an effective quantization of gravity is proposed, as gravity has not been definitively quantized yet, so it is still a matter of theoretical arguments .

Now if this probability locus is unique or if there are many universes ,again it is a matter of speculation.

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  • $\begingroup$ Thanks. But can you explain a little bit what "probability locus" means in terms of existence. I mean in some naive way. Does it mean "potential existence". $\endgroup$ – Zuhair Al-Johar Mar 17 at 13:11
  • $\begingroup$ It is the same mathematically as the electron orbital in the hydrogen atom hyperphysics.phy-astr.gsu.edu/hbase/Chemical/eleorb.html . The modulus squared of the wavefunction of the universe at that time $\endgroup$ – anna v Mar 17 at 15:17
  • $\begingroup$ Well this is not a naive explanation. However, I get from what you are saying, that the universe didn't come out from Nothing, but from a probability locus, whatever that could be, it's not the same as nothing. Since we hold "existence" to be dichotomous, then it comes from something! apparently something very small? that you call a probability locus, still the question begs itself, form where this probability locus came from? $\endgroup$ – Zuhair Al-Johar Mar 17 at 18:32
  • $\begingroup$ In quantum mechanics, within the Heisenberg uncertainty principle, there is a possibitlity of particle antiparticle loops to exist for a delta(time). There are speculations on these lines, i.e. quantum mechanical , but it is all just that, speculations. example physics.aps.org/synopsis-for/10.1103/PhysRevLett.121.251301 $\endgroup$ – anna v Mar 17 at 19:11
  • $\begingroup$ I see. But uncertainty is only agnosticism. It appears from your output, that various models are saying that the universe didn't come from nothing. From where it came then? Answer: nothing known yet, just speculations. Possible further step into uncertainty: nothing can be known (even in the future), only speculations can ever be given. $\endgroup$ – Zuhair Al-Johar Mar 17 at 19:29

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