Can Objects Really Travel Through Forbidden Space Between Black and White Holes?

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Discussion Overview

The discussion revolves around the concept of forbidden space between black holes and white holes, particularly questioning how objects might traverse this region. Participants explore theoretical implications, geometrical considerations, and the existence of white holes in the universe.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions how objects can travel through forbidden space as depicted in a diagram, specifically regarding the transition from black holes to white holes.
  • Another participant notes that black holes formed by collapse may not exhibit the same geometry as the Kerr solution, suggesting that the internal structure could differ significantly.
  • A participant expresses interest in understanding the Cauchy Horizon, seeking a diagram for clarification, but later finds definitions independently.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the nature of forbidden space or the geometry of black holes, indicating multiple competing views and unresolved questions.

Contextual Notes

There are limitations regarding the assumptions made about the geometry of black holes and the definitions of forbidden space, as well as the lack of clarity on the existence of white holes.

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http://www.astronomical.org/astbook/blkhole.html

Schneibster posted this link and I'm glad he did because it's very interesting. After reading it I have one question because I don't completely understand this diagram:

http://www.astronomical.org/astbook/images/fig8.gif

Gray is forbidden space. My question is, if gray is forbidden space, how does an object travel in through a black hole and out through a white hole crossing the forbidden space as shown in the diagram?

2 more things.

1. Are universes square?
2. Are there any known white holes in our universe?

Thanks
 
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One thing you might want to know - black holes formed by collapse are probably not going to have this geometry (the geometry of the Kerr solution). The geometry outside the (outer) event horizon of the black hole will be the same, but inside it will be considerably different.


this paper

has some of the best current estimates of what the actual structure of a collapsing black hole would look like (unless there is a more modern paper that's escaped my notice, which is possible).
 
Thanks. I understand the paper, but I would like to know what exactly is the Cauchy Horizon? Like a diagram.
 
Last edited:
Nevermind I googled it and found some cool definitions, thanks anyway.
 

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