How Did the Universe Create Itself from Nothing?

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Discussion Overview

The discussion revolves around the question of how the universe could create itself from nothing, exploring concepts related to cosmology and the conditions of the universe at its inception. Participants express uncertainty regarding the state of knowledge about the universe's origins and its expansion.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant questions whether there is any definitive understanding of what existed before the universe's creation.
  • Another participant notes that there are no successful models explaining conditions prior to the Big Bang.
  • Some participants suggest that while models can describe the universe shortly after the Big Bang, they rely on assumptions about extreme conditions that cannot be tested experimentally.
  • There is mention of the universe's expansion, but uncertainty remains about the reasons behind this phenomenon.
  • It is proposed that the early universe was extremely hot and dense, which challenges the existence of matter as understood today.
  • Some participants highlight that the physics of the early universe may involve processes not observable in the current universe.

Areas of Agreement / Disagreement

Participants generally agree that there is no clear consensus on how the universe originated from nothing, and multiple competing views regarding the nature of the universe's beginnings remain unresolved.

Contextual Notes

Limitations include the lack of empirical data on conditions before the Big Bang and the dependence on theoretical models that may not be universally accepted. The discussion also reflects uncertainty about the mechanisms driving the universe's expansion.

babbane9
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hello!
I would like to know: how did the universe create itself from nothing?
I'm a novice in a physics so maybe it's not a good question
thank you
babbane9
 
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:welcome:

Hello and welcome to PF!

I moved your question to our Cosmology section, because although there is a lot of quantum mechanics going on at the beginning of our universe, it's actually a cosmological question. But I doubt that there is an easy answer, for nobody knows for sure. As far as I remember - and it might be wrong - our models reach back until ##t= 10^{-20}\, s##, maybe ##t= 10^{-40}\, s##, but not until ##t=0##.
 
thank you for your answer,
if I understand, there is nobody who know really how it was before the creation of the universe?
And I have an other question, why does our universe is in expansion?
 
We also don't even know for sure that the universe came from "nothing." There are no successful models that explain what happens before the Big Bang.
 
We have models which can reasonably explain the condition of the Universe a very short time after the big bang event,
There are various models that would lead to the Universe as we observe it to be now, but they all start with notion that at the earliest times it must have been extremely hot and dense.
So much so that 'matter' as we understand it today could not exist, atoms came quite a while later.
Up to a point we can study what happens at extreme density and temperature by using particle accelerators.
Beyond that point we have no way to reproduce the conditions and test them, so it's all guesswork really.
It widely believed however that there could be physics going on which simply does not occur anywhere in the Universe of the present.
 
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