Why Do We Believe the Big Bang Contained All Matter and Energy in the Universe?

AI Thread Summary
The discussion centers on questioning why the Big Bang is believed to have contained all the matter and energy in the universe. It suggests that if the Big Bang originated from a localized point, there could be other similar points elsewhere in the universe, potentially leading to multiple Big Bangs. Observations currently support the idea of a singular Big Bang, but the limitations of our observational capabilities raise questions about the existence of other localized events. The need for a competing theory to explain these phenomena is emphasized, highlighting that any new theory must account for existing observations. Ultimately, the conversation reflects on the challenges of understanding the universe's origins and the necessity of further exploration.
Mazerakham
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Why do we think that the Big Bang contained "all" the matter/energy in the universe? If we imagine the point, the "big bang point" to be some accumulation of mass, what makes us think that it should have "waited" for all the mass in the universe to accumulate in it before exploding?

That's just a thought that occurred to me.
 
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Mazerakham said:
Why do we think that the Big Bang contained "all" the matter/energy in the universe? If we imagine the point, the "big bang point" to be some accumulation of mass, what makes us think that it should have "waited" for all the mass in the universe to accumulate in it before exploding?

That's just a thought that occurred to me.

When we reverse the film that is the expansion of the universe, we are able to see that all the matter in the universe came from one very localized place in space and time. We have been able to reverse this film back to one billionth of a second before the BB, and there are no discrepancies worth noting.
 
Why couldn't there be other such localized areas, billions upon billions of light years away from another bigbang. There could have been billions of bigbangs all over the universe. We just can't see far enough to gather the appropriate information, and we need to do more than just see as well. We have to go there, where ever there is. :P
 
bucky1andonly said:
Why couldn't there be other such localized areas, billions upon billions of light years away from another bigbang. There could have been billions of bigbangs all over the universe. We just can't see far enough to gather the appropriate information, and we need to do more than just see as well. We have to go there, where ever there is. :P

1] We base our theories on what we observe. No observation, no theory.

2] A competing theory to what we have needs to explain everything our current theory does at least as well if not better. What does you supposition about matter elsewhere do?

bucky1andonly said:
We just can't see far enough to gather the appropriate information, and we need to do more than just see as well. We have to go there, where ever there is. :P
Why?
 

Thread 'Matter density right after the decoupling'

https://en.wikipedia.org/wiki/Recombination_(cosmology) Was a matter density right after the decoupling low enough to consider the vacuum as the actual vacuum, and not the medium through which the light propagates with the speed lower than ##({\epsilon_0\mu_0})^{-1/2}##? I'm asking this in context of the calculation of the observable universe radius, where the time integral of the inverse of the scale factor is multiplied by the constant speed of light ##c##.
View full post »

Thread 'Hubble Constant, Dark Energy and the Expanding Universe'

Why was the Hubble constant assumed to be decreasing and slowing down (decelerating) the expansion rate of the Universe, while at the same time Dark Energy is presumably accelerating the expansion? And to thicken the plot. recent news from NASA indicates that the Hubble constant is now increasing. Can you clarify this enigma? Also., if the Hubble constant eventually decreases, why is there a lower limit to its value?
View full post »

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