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Could it be that the white hole will never be physical found in this universe,since this universe is already occupied after big bang? Is it possible that the business end of a black hole can only establish a big bang where there is void?
Question Date: 2018-03-19
Answer 1:

Theoretically, a white hole does exists, because it (together with its paired black hole) is a solution of the Einstein's equation for gravity. But to "find" a white hole is difficult.

A white hole is connected with a black hole through a "worm hole", or an Einstein-Rosen bridge.

A brave adventurer has to enter a black hole horizon, and if he survives all the extreme conditions in that hell of twisted space-time, he may exit through a white hole and claim success. But, as Thorne carefully studied before, the condition that permits an adventurer to pass through the worm hole is almost impossible. And, a less brave observer far from the black hole, who plans to videotape what happens to the adventurer, will never see him enter the black hole, because of the "infinite red shift" at the horizon of the black hole, namely time is infinitely dilated at the black hole horizon.

But if we do not want adventurers to risk their lives, it is possible to observe some signature of white hole through, say, gamma ray burst. This was proposed about 10 years ago, but I am not sure how firmly it is established now.

Answer 2:

No - the big bang did not expand out into a void. The big bang was a rapid expansion of space itself, with all of the matter and energy located in space being more-or-less carried along for the ride.

Black holes are objects in the universe where the gravity is so strong that light cannot escape from them. Because gravity and the movement of space are expressions of the same phenomenon, this means that you can think of black holes as sort of an inverse of the big bang, i.e. the big bang is a sort of a white hole.

However, black holes are localized places where space collapses back into a point. Black holes are located at a specific place in space. There is no center of the explosion that was the big bang. The big bang was everywhere at once!

Apart from the big bang itself, we know of no white holes in the universe. We also have no plausible ways in which a white hole might be created, since gravity is an attractive force, not a repulsive force. You would also expect a white hole to blow itself apart, for the same reason. We do know about ways that black holes can form, however. This is probably the reason why black holes exist and white holes do not.

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