Undergrad Supermassive singularity the cause of the Big Bang?

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SUMMARY

The discussion centers on the nature of singularities and their relationship to the Big Bang and black holes. Participants clarify that the Big Bang singularity differs from black hole singularities, emphasizing that black holes are colder than the Cosmic Microwave Background (CMB) radiation. They discuss the implications of Hawking radiation and the conditions under which black holes can evaporate, concluding that black holes will eventually lose mass as the CMB cools below their Hawking temperature. The conversation also touches on primordial black holes (PBHs) and their potential impact on the CMB.

PREREQUISITES
  • Understanding of general relativity and its implications for singularities
  • Familiarity with black hole thermodynamics and Hawking radiation
  • Knowledge of the Cosmic Microwave Background (CMB) and its significance in cosmology
  • Basic concepts of primordial black holes (PBHs) and their formation
NEXT STEPS
  • Research the differences between black hole singularities and Big Bang singularities
  • Learn about the conditions for black hole evaporation and the role of Hawking radiation
  • Explore the implications of primordial black holes on cosmic structure and the CMB
  • Investigate current theories and experiments related to detecting Hawking radiation
USEFUL FOR

Astronomers, physicists, and cosmologists interested in the fundamental nature of black holes, the Big Bang, and the evolution of the universe.

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  • #32
Arman777 said:
https://arxiv.org/abs/0912.5297

Equation 1.1? In that equation, ##t# is the time after the Big Bang the the PBH forms; basically the equation is saying that the more time has elapsed since the Big Bang, the larger a PBH formed at that time would be. This is because the more massive a black hole is, the less "dense" it is (where "density" here means "the mass of the black hole divided by the volume of a Euclidean 3-sphere with a surface area equal to the black hole's horizon area"--which is not the actual physical density of the hole, since a black hole doesn't have a well-defined density, but plays the role of a density in the authors' proposed model for PBH formation).
 
  • #33
PeterDonis said:
his is because the more massive a black hole is, the less "dense" it is
I did no understand this part.
 

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