Black hole similar to pre universe

In summary, the topic of whether the singularity at the bottom of a black hole is similar to the state of the universe before the big bang is a common discussion on forums. However, it is generally believed that the big bang did not occur from a "tiny point" and that a black hole actually has a high entropy. Black holes are not a way for the universe to converge back to a low-entropy state, and it is difficult to observe their explosion due to the long time it takes for them to lose mass. The minimum mass for a black hole is the Planck mass, which is incredibly small, and the explosion of a black hole at this mass would be very weak.
  • #1
faddishworm
9
0
Hey all,

I was wondering if the singularity at the bottom of a black hole is similar to what the universe would be like before the big bang, i.e. heaps of mass/energy concentrated into a tiny point.

To me I always think of black holes as sinkholes dotted throughout the universe which are like super highways for entropy to be destroyed and return to a low-entropy state.

If the whole universe is like a closed thermodynamic system, then black holes are like concentrated points in which higher entropy pockets quickly become lower entropy.

Am I interpreting this properly and is it correct?

Are black holes the universes way of trying to converge back to its low-entropy t=0 state?

If a black hole sucks in a bunch of matter, then explodes is that not similar to the big bang?
 
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  • #2
This topic is discussed at least once a month on these forums: I'd recommend you search through some of the threads. Short answer: no, the big bang is not like a black hole. The big bang did not occur from a "tiny point" -- a singularity is not a physical point: both the big bang and black hole singularities are spacelike hypersurfaces (really moments in time!)
 
  • #3
Actually, it is believed a black hole has very high entropy. The entropy that enters a black hole is not destroyed [which is believed impossible due to the laws of thermodynamics], merely trapped. Physicists generally believe it is slowly returned to the universe via Hawking radiation. It is believed a black hole cannot explode until most of its mass has been carried off by Hawking radiation. This is difficult to test because it takes an unimaginable amount of time for an ordinary black hole to lose mass. Except for the theoretical primordial black holes, whose existence is unproven and in doubt, an ordinary black hole is much more massive than the sun. The background temperature of the universe is still much higher than its Hawking radiation temperature, so all black holes are actually absorbing more energy than they emit. Evaporation cannot even begin until the background temperature shrinks below the black hole temperature. This will require many billions of years. As noted, a black hole cannot explode until it has radiated away so much mass it can no longer hold itself together. The minimum mass necessary to form a black hole is the Planck mass, which is quite miniscule [much less than a gram]. It is uncertain at what mass a physical black hole would become at risk of detonation, but, it is fairly certain to happen when it fell to a Planck mass. The 'bang' produced by a decomposing Planck mass black hole would be spectacularly feeble.
 

What is a "Black hole similar to pre universe"?

A "Black hole similar to pre universe" is a theoretical concept that suggests that the universe may have started off as a black hole. This idea is based on the theory of cosmic inflation, which proposes that the universe underwent a rapid period of expansion in its early stages.

How is a black hole similar to the pre universe?

In the theory of cosmic inflation, the universe was extremely dense and compact, similar to a black hole. This means that the laws of physics that govern black holes may also apply to the early universe.

Can black holes be used to study the pre universe?

While black holes can provide insights into the laws of physics that govern the early universe, they cannot be used to directly study the pre universe. This is because the intense gravitational forces inside a black hole make it impossible for anything, including light, to escape.

What evidence supports the existence of a "Black hole similar to pre universe"?

While there is no direct evidence for the existence of a "Black hole similar to pre universe", the theory of cosmic inflation has been supported by various observations and experiments, such as the cosmic microwave background radiation and the large-scale structure of the universe.

What implications does the idea of a black hole similar to the pre universe have for our understanding of the universe?

The concept of a black hole similar to the pre universe challenges our current understanding of the origins of the universe and the laws of physics that govern it. It also raises questions about the ultimate fate of the universe and the possibility of other universes existing within black holes.

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