Could Black Holes Lead to New Universes?

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SUMMARY

The discussion centers on the hypothesis that black holes could potentially lead to the formation of new universes through processes like the Big Crunch. It establishes that while black holes consume mass, they ultimately decay via Hawking radiation, reaching a state of maximum entropy. The distinction between the singularities of black holes and the Big Crunch is emphasized, clarifying that they are fundamentally different phenomena. The concept of multiple universes is explored in Sean Carroll's book, "From Eternity to Here," which delves into the relationship between entropy and the arrow of time.

PREREQUISITES
  • Understanding of Hawking radiation and its implications on black hole entropy
  • Knowledge of cosmological concepts such as the Big Bang and Big Crunch
  • Familiarity with the theory of singularities in general relativity
  • Basic grasp of the arrow of time and entropy in physics
NEXT STEPS
  • Read "From Eternity to Here" by Sean Carroll to explore the relationship between time and entropy
  • Investigate the implications of Hawking radiation on black hole thermodynamics
  • Study the differences between black hole singularities and cosmological singularities
  • Examine current research on the multiverse theory and its relation to black holes
USEFUL FOR

Astronomers, physicists, and cosmologists interested in the theoretical implications of black holes and the nature of the universe's expansion and entropy.

aishwaryaj
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Random musing:

Could it be that sufficient expansion of the universe that leaves behind only black holes that have gobbled up all the mass, lead to several big crunches, and eventually several new universes?
 
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Based on my understanding, this wouldn't happen for a couple of reasons:

First, while all the matter being gobbled up into black holes is a possibility for the fate of the universe there is still further development that increases the entropy of the universe even further (following the entropy based arrow of time). This is Hawking radiation, where black holes slowly decay, leaving behind a featureless and constant collection of particles - the highest entropy point (equilibrium).

Also, the collection of matter in a black hole is not the same as the Big Crunch. The Big Crunch, if it occurred, would result from the gravity of the matter in the universe slowing the universe's expansion to a halt and re-collapsing it into a singularity. This is not the same thing as a black hole, although both involve singularities. For a simple explanation of the difference between the Big Bang (or Big Crunch) singularity and that of a black hole visit: http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/011030a.html
Or for a more technical explanation visit: http://math.ucr.edu/home/baez/physics/Relativity/BlackHoles/universe.html

It's a cool idea though and something sort of similar is being tentatively explored by physicists right now. I read about the idea of multiple baby universes being created in Sean Carrol's From Eternity to Here. It is a great book exploring the arrow of time and entropy, as well as some speculative stuff based off of that. A link in Physics Forums discussing the idea is: https://www.physicsforums.com/showthread.php?t=469255
 

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