Spacetime Expansion in Big Bang 100% Certainty?

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Discussion Overview

The discussion revolves around the nature of spacetime expansion in the context of the Big Bang theory, exploring whether spacetime itself is a fundamental aspect of the universe or if it could be an emergent property from pre-existing space and time. Participants question the certainty of current cosmological models and the implications of General Relativity (GR) in relation to Quantum Mechanics (QM).

Discussion Character

  • Debate/contested, Conceptual clarification, Exploratory

Main Points Raised

  • One participant suggests that if space and time existed prior to the Big Bang, then the Big Bang could be viewed as an explosion of matter rather than a creation of spacetime.
  • Another participant questions the notion of "100% certainty" in cosmological theories, especially given the limitations of current experimental physics.
  • There is a claim that General Relativity may conflict with Quantum Mechanics, raising the possibility that GR could be incorrect.
  • It is proposed that GR is an approximation and not a complete theory, which implies that it may not fully describe gravitational behavior in the quantum realm.

Areas of Agreement / Disagreement

Participants express differing views on the nature of spacetime and the certainty of cosmological models. There is no consensus on whether spacetime is an immutable aspect of physics or if alternative models could exist.

Contextual Notes

The discussion highlights the unresolved nature of the relationship between General Relativity and Quantum Mechanics, as well as the assumptions underlying the Big Bang theory and the concept of spacetime.

Alfrez
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In Big Bang theory, Spacetime itself expands from Planck size to the universe today. This means there is no existing space before the bang.

But what if we assume space and time already existed in the universe and the Big Bang was an explosion of just matter. Is there no cosmology theory or model that can ever support this? If so. Then it means spacetime geometry being elastic is a law of physics set in stone and not irreplaceble with anything else forever and a categorical finality with 100% certainty??
 
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100% certainty is a tall order, especially when talking about something that's so remote from current lab-testable physics.
 
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General Relativity is in severe conflict with Quantum Mechanics. Does it mean that it is still possible General Relativity is wrong?
 
GR is an approximation, and it's also not a complete theory of everything. It doesn't make predictions about QM, so that the behavior of gravity in the QM realm is not (yet) known. In the sense that GR is an approximation, it is by definition not completely "right".
 

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