Black Holes and The End of Spacetime

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SUMMARY

The discussion centers on the nature of black holes and singularities as described in Stephen Hawking's "A Brief History of Time." Participants clarify that a singularity is not a defined point but rather a breakdown in the mathematical model where current physics cannot explain conditions. It is established that while one approaches the center of a black hole, known as the singularity, they will inevitably reach it, although they would be destroyed long before arrival. The conversation emphasizes the need for a theory of quantum gravity to better understand the complexities of singularities.

PREREQUISITES
  • Understanding of general relativity and its implications on spacetime.
  • Familiarity with black hole physics and event horizons.
  • Basic knowledge of singularities in theoretical physics.
  • Awareness of quantum gravity concepts and their significance.
NEXT STEPS
  • Research the implications of general relativity on black hole formation.
  • Study the concept of event horizons and their effects on time perception.
  • Explore current theories in quantum gravity and their potential to explain singularities.
  • Examine the mathematical models used to describe black holes and singularities.
USEFUL FOR

Students, physicists, and anyone interested in advanced theoretical physics, particularly those exploring the complexities of black holes and the nature of spacetime.

SteveManPhy076
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Recently I was reading Stephen Hawking's brilliant book "A Brief History of Time" and I believe I can recall him writing multiple paragraphs about falling into a black hole. I think I remember him saying that if you were to fall in all of time begins to collapse and the singularity will always be in your future but not your past, I'm taking this as meaning that you will never reach the point of infinite density?? Can someone elaborate, please?

(sorry I'm kind of dumb in comparison to him right now because I'm still in high school)
 
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No, it doesn't. First, "singularity" is not really the "point" at the center of a black hole. "Singularity" just means "the place where the math model breaks down and we don't know WHAT is going on". Second, yes, you DO get to the center. He did not mean to imply that you don't. It will be in you future until you get there. Of course, that's all pretty meaningless anyway since you would have been utterly destroyed long before you get there.

Now, you WILL hear the singularity described as a point but it is believed that if we ever get a theory of quantum gravity, that will probably resolve to something more complex. Calling it a point is just shorthand for all of that.
 

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