Black hole at the beginning of time

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SUMMARY

The discussion centers on the misconception that the Big Bang originated from a single point, which would imply a black hole formation. Participants clarify that the Big Bang was an event occurring uniformly throughout space, leading to an isotropic distribution of matter and energy, thus preventing the conditions necessary for black hole formation. The term "Big Bang" itself is criticized for being misleading, suggesting that "Ubiquitous Bang" may be a more accurate descriptor. The conversation also touches on the implications of General Relativity (GR) and the Friedmann-Lemaître-Robertson-Walker (FLRW) model in understanding the universe's expansion and structure.

PREREQUISITES
  • Understanding of General Relativity (GR)
  • Familiarity with the Friedmann-Lemaître-Robertson-Walker (FLRW) model
  • Knowledge of isotropy and homogeneity in cosmology
  • Basic concepts of black hole physics
NEXT STEPS
  • Research the Friedmann-Lemaître-Robertson-Walker (FLRW) metric in cosmology
  • Study the implications of isotropy and homogeneity in the universe's structure
  • Explore the differences between black holes and the early universe conditions
  • Investigate alternative cosmological models and their terminology
USEFUL FOR

Astronomers, physicists, and students of cosmology seeking to deepen their understanding of the universe's origins and the misconceptions surrounding the Big Bang theory.

  • #61
PeterDonis said:
Is impossible as you state it here since, as @vanhees71 has correctly pointed out, isotropy about only one point does not imply homogeneity.
It's clear from the context that "isotropic" means isotropic at every point. That must be the default terminology in any case.
 
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  • #62
Well, it's obvious that isotropy around only one point is not enough. It's however also pretty intuitive that isotropy around all points implies homogeneity (but not the other way, i.e., homogeneity does not imply isotropy around any point). Weinberg's definitions and proofs in Gravitation and Cosmology (Chpt. 13) is also not too difficult to follow.
 
  • #63
PeterDonis said:
No global chart in any curved spacetime can be inertial.
Yes that's is true in general, in the particular case of chart described in #56 the reason behind it should be that pointed out there, I believe.
 
Last edited:

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