Black holes and extra dimensions

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SUMMARY

This discussion centers on the relationship between string theory, extra dimensions, and black holes. It highlights that string theory and its extension, M-Theory, propose the existence of additional dimensions beyond the conventional 4D spacetime. The conversation suggests that these extra dimensions could potentially interact with black holes, allowing high-frequency gravity waves to penetrate them, leading to the concept of parallel universes. Stephen Hawking's endorsement of M-Theory as a candidate for a complete theory of the universe is also noted, although the existence of these dimensions remains speculative and unproven.

PREREQUISITES
  • Understanding of string theory and M-Theory
  • Familiarity with the concept of singularities in black holes
  • Knowledge of higher-dimensional spaces and their implications
  • Basic grasp of gravitational waves and their properties
NEXT STEPS
  • Research the implications of extra dimensions in string theory
  • Explore the concept of singularities in the context of M-Theory
  • Investigate the role of gravitational waves in black hole physics
  • Read Stephen Hawking's works on M-Theory and its relevance to cosmology
USEFUL FOR

Physicists, cosmologists, and students of theoretical physics interested in the intersections of string theory, black hole research, and higher-dimensional spaces.

AuntyMatter
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We often hear about string theory requiring extra dimensions over and above our 4D spacetime. Does this shed any light on the singularity which is supposed to exist at the centre of a black hole? Does our normal spacetime simply join the other dimensions in their hidden (curled-up) form?
This is probably nonsense, but if I don't ask I won't know for sure.
 
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AuntyMatter said:
We often hear about string theory requiring extra dimensions over and above our 4D spacetime. Does this shed any light on the singularity which is supposed to exist at the centre of a black hole?
I've never heard any such suggestion. Why would it?

Does our normal spacetime simply join the other dimensions in their hidden (curled-up) form?
I believe so, but I don't know much about that stuff.
 
String Theory and its offshoot, M-Theory, lead to extra dimensions and parallel universes. There is no proof of either. If the extra dimensions exist, they could be right around you, not just at black holes, and they could be large, not small, but they are inpenetrable by light or matter or electromagnetic waves; however, at black holes, it is postulated that high frequency gravity waves may be able to penetrate these higher order dimensions that lead to parallel (brane) universes. Just speculation , not theory, but Hawking is a big supporter of M-Theory, which he claims is the only candidate for a complete theory of the universe. As I understand it from my readings, otherwise, I don't know much more.
 
Thanks to both of you for your answers
 
AuntyMatter said:
We often hear about string theory requiring extra dimensions over and above our 4D spacetime. Does this shed any light on the singularity which is supposed to exist at the centre of a black hole? Does our normal spacetime simply join the other dimensions in their hidden (curled-up) form?
This is probably nonsense, but if I don't ask I won't know for sure.

Singularities in string theory, Edward Witten

https://arxiv.org/abs/hep-th/0212349
 

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