Almost-universe-sized black hole

In summary, the conversation discusses the concept of acceleration being caused by an attraction to something surrounding us, rather than being propelled outward from within. This idea could potentially contradict the observed Hubble law and the existence of the cosmic microwave background. The conversation also touches on the possibility of this attraction being caused by a massive black hole, and the implications this would have on our understanding of the universe and the cosmological principle. It is suggested that this topic would be more appropriate for the Cosmology subforum.
  • #1
Meatbot
147
1
What if acceleration is really an attraction to something surrounding us?

What would happen if a black hole gained size over the history of the universe until it comprised a huge percentage of the universe? And what if that universe was curved so that as the black hole expanded, it began to approach itself on the other side, like drawing larger and larger circles on a ball? What would the observer in the remaining part of the universe see as this black hole closed up? Wouldn't it look like accelerating expansion as the galaxies are pulled toward the monster black hole all around them with greater and greater force? Does this model have any correlation with anything in the real world or am I a crackpot? Has anyone looked at this?

Basically the idea is: What if expansion is really being attracted to something which surrounds us instead of being propelled outward from within?
 
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  • #2
Meatbot said:
Basically the idea is: What if expansion is really being attracted to something which surrounds us instead of being propelled outward from within?
Then the velocities of galaxies would not be proportional to the distance, contradicting the observed Hubble law (or perhaps we would have a privileged role of being in the center of the universe).
And of course, there would be no cosmic microwave background.

But this belongs to the Cosmology subforum.
 
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  • #3
Demystifier said:
Then the velocities of galaxies would not be proportional to the distance, contradicting the observed Hubble law (or perhaps we would have a privileged role of being in the center of the universe).
And of course, there would be no cosmic microwave background.

But this belongs to the Cosmology subforum.

What if it was so far away that even if you weren't exactly in the center you wouldn't be able to get enough accuracy on your measurements to tell the difference?

Cosmic background is a big problem, though. I didn't think of that. Any way that the cosmic background could be closer to us than the event horizon of this black hole? What if it's actually the material falling into it? It's a stretch I know.

Sorry about posting to the wrong subforum.
 
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  • #4
Meatbot said:
What if it was so far away that even if you weren't exactly in the center you wouldn't be able to get enough accuracy on your measurements to tell the difference?
But that means we're pretty much in the centre of the universe (since your black hole is on the same scale as the size of the universe). This does not agree with the cosmological principle.

Sorry about posting to the wrong subforum.

Yes, this is cosmology and thus, if appropriate to any forum, would belong there.
 

1. What is an "almost-universe-sized black hole"?

An "almost-universe-sized black hole" is a theoretical type of black hole that is believed to be incredibly massive, with a size close to that of the observable universe. It is thought to have a mass of approximately 10^52 kilograms, making it billions of times larger than the largest known black hole.

2. How is the size of a black hole determined?

The size of a black hole is determined by its event horizon, which is the point of no return for anything that gets too close to the black hole. The event horizon is directly related to the mass of the black hole, so the larger the mass, the larger the event horizon and therefore the larger the black hole.

3. How is an "almost-universe-sized black hole" different from a supermassive black hole?

An "almost-universe-sized black hole" is significantly larger than a supermassive black hole, which is the largest type of black hole currently known to exist. While a supermassive black hole can have a mass of up to 10^41 kilograms, an "almost-universe-sized black hole" has a mass that is billions of times greater.

4. How are "almost-universe-sized black holes" formed?

The formation of an "almost-universe-sized black hole" is currently unknown and is purely theoretical. It is possible that these black holes could have formed in the early stages of the universe, during the collapse of multiple supermassive stars. However, more research is needed to fully understand their formation.

5. What is the significance of studying "almost-universe-sized black holes"?

Studying "almost-universe-sized black holes" could provide insight into the origins and evolution of the universe. These massive black holes could also help scientists better understand the laws of physics at extreme scales and provide a better understanding of how galaxies and other structures in the universe are formed and influenced by these massive objects.

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