Inside Out: The Possibility of White Holes and Black Holes Within Each Other

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Discussion Overview

The discussion explores the hypothetical scenarios of white holes and black holes existing within each other, focusing on theoretical implications and the nature of these entities within the framework of General Relativity.

Discussion Character

  • Exploratory, Debate/contested, Conceptual clarification

Main Points Raised

  • One participant questions the possibility of white holes existing inside other white holes and similarly for black holes.
  • Another participant suggests that it may be impossible to test what occurs inside a black hole's event horizon, raising a question about the potential for negative mass within a black hole to create a second event horizon.
  • A different participant asserts that when black holes merge, they simply form a larger black hole, implying that the formation of a black hole within a black hole is not feasible.
  • There is a consensus among some that white holes are largely viewed as mathematical constructs without physical reality.
  • One participant notes that negative mass is also considered a mathematical oddity.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility of black holes existing within each other, with some asserting it is impossible while others explore the theoretical implications of negative mass. There is no consensus on the existence of white holes.

Contextual Notes

The discussion includes assumptions about the nature of black holes and white holes, the implications of General Relativity, and the limitations of current understanding regarding event horizons and negative mass.

BATMANofPHYSICS
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hypothetically speaking, are white holes inside white holes possible?
and also, are black holes inside black holes possible?
 
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It may be literally impossible to test for what goes on inside the event horizon of a black hole, so there's probably no way of knowing.

But...

If there's an expert in General Relativity willing to comment, an alternative question would be, in the Schwarzschild metric, can spherical shells of negative mass (or some other such thing) within the event horizon of one black hole, make the local curvature flat enough that you can meaningfully talk about a second event horizon further down?

Maybe one way of thinking about it would be to say whether such a shell would allow you to arrest your descent if you had a relativistic orbital velocity?

I know very little about General relativity, so I can't comment beyond that.
 
I have read it here several times that when black holes merge, the result is just a bigger black hole. there is no way to form a black hole inside a black hole.

White holes are generally considered to be a mathematical oddity with no physical reality.
 
Indeed, negative mass is a mathematical oddity.
 

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