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Can one say the occurrence of white holes is related to a single point in a spinning black hole? The white holes can form only when the singularity in the black hole is a ring and not a point, right?
Question Date: 2019-03-11
Answer 1:

Since we've never seen a white hole or anything that could be interpreted as such, we can't be sure if they exist at all, let alone how they form.

Einstein's theory of general relativity predicts that spinning black holes will have ring-shaped singularities as opposed to point singularities. However, the very concept of a singularity violates Heisenberg's uncertainty principle from quantum mechanics. Unlike with white holes, we are fairly certain that black holes do exist, since there are a number of objects that we have detected for which black holes are by far the most plausible explanation. Without being able to see what is inside of the event horizon, though, we really don't have any idea of what takes place inside. To the best of my knowledge, most physicists believe that gravity has a quantum description that we haven't yet elucidated. If so, then Einstein is wrong in that real black holes don't contain singularities of any type.

Answer 2:

I'll just send you this from Wikipedia, because white holes are new to me:
white holes.

In general relativity, a white hole is a hypothetical region of spacetime which cannot be entered from the outside, although matter and light can escape from it. In this sense, it is the reverse of a black hole, which can only be entered from the outside and from which matter and light cannot escape.

If white holes are Hypothetical, I'm not sure how much one can say about them, but the Wikipedia link will will tell you more.

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