Dark Energy: Big Bang, Big Crunch & Expansion

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Discussion Overview

The discussion revolves around the concepts of dark energy, the fate of the universe, and the potential scenarios of cosmic evolution, including the Big Crunch and the implications of black holes. Participants explore theoretical outcomes of cosmic expansion and the role of black holes in the universe's future.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants question whether the Big Crunch is likely to occur or if dark energy will dominate gravity, leading to continuous expansion of the universe.
  • One participant suggests that current measurements indicate an accelerated expansion of the universe, potentially resulting in a state of "big nothing" or darkness in the future.
  • There is a proposal that black holes, once formed in galaxies, could consume all matter and antimatter, condensing it into a form of energy similar to that before the Big Bang.
  • Another participant challenges the idea that black holes act as vacuum cleaners, explaining that their gravitational influence does not change the orbits of surrounding planets when matter is compressed into a black hole.
  • It is mentioned that black holes can eventually evaporate over a long time due to Hawking radiation, leading to their disappearance.

Areas of Agreement / Disagreement

Participants express differing views on the fate of the universe, with no consensus on whether dark energy will lead to continuous expansion or if a Big Crunch is possible. The role and behavior of black holes also generate debate, particularly regarding their consumption of matter and their eventual fate.

Contextual Notes

Some assumptions regarding the nature of black holes and cosmic expansion are not fully explored, and the discussion includes unresolved questions about the long-term implications of dark energy and black hole dynamics.

mysteriously
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Is the reverse of big bang that is big crunch likely to happen??or will dark energy dominate the gravity and the space will coninuoisly expand?
 
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current measurements indicate that the universe is expanding at an accelerated rate so the end will be like the big nothing (from the Neverending story) darkness everywhere.
 
but won't black holes(after many of them are formed in each galaxy) consume all the matters(/antimatters) of the universe to form the tiny condensed form of vast energy as it was before the big bang?isnt it possible?
 
mysteriously said:
but won't black holes(after many of them are formed in each galaxy) consume all the matters(/antimatters) of the universe to form the tiny condensed form of vast energy as it was before the big bang?isnt it possible?

No, this is not how a black hole works. If we took the Sun and compressed it until it reached a density high enough for it to form a black hole, the gravitational pull measured from the old surface and out would be unaffected. (Meaning that the Earth and other planets would not change in their orbits) Since we compressed all the matter into a tiny area it is only from the old surface of the Sun to the new surface (which in this case would be the event horizon) that the gravity would change. Black holes are NOT voracious vacuum cleaners sucking up all the matter around them like they are commonly portrayed.
 

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