Spacetime Expansion in Big Bang 100% Certainty?

[Alfrez]

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??

 

[BillSaltLake]

100% certainty is a tall order, especially when talking about something that's so remote from current lab-testable physics.

 

[Alfrez]

General Relativity is in severe conflict with Quantum Mechanics. Does it mean that it is still possible General Relativity is wrong?

 

[BillSaltLake]

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".

 

[sardar]

There is currently overwhelming evidence in support of the Big Bang theory and the expansion of spacetime. However, as a scientist, I cannot claim 100% certainty on any theory or model. Science is a process of continuous exploration and refinement, and our understanding of the universe is constantly evolving.

While the Big Bang theory is the most widely accepted explanation for the origins of the universe, there are other theories and models that have been proposed. It is possible that future discoveries or advancements in technology may lead to a better understanding of the universe and potentially challenge our current understanding of the Big Bang.

Furthermore, the concept of spacetime being elastic and expanding is based on our current understanding of physics. It is possible that future discoveries may lead to a different understanding of spacetime and its properties. Therefore, it is important for scientists to remain open-minded and continue to question and explore different theories and models.

In summary, while the Big Bang theory and the expansion of spacetime are currently the most widely accepted explanations, as a scientist, I cannot claim 100% certainty on any theory or model. Our understanding of the universe is constantly evolving and it is important to continue to question and explore different possibilities.