We went to a planetarium last night last night and watched "Black Holes" narrated by Liam Neeson. If I recall correctly, he said that scientists believe that they have identified a number of Black Holes, and that they think there are White Holes at the bottom of Black Holes and instead of drawing matter/light in, the White Holes spew matter out. I didn't get to ask this question after the session was over: Have scientists been able to find an example of a possible White Hole?
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3$\begingroup$ The Big Bang is pretty much it. $\endgroup$– AndrewFeb 29, 2012 at 23:34
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$\begingroup$ @Andrew: No, the Big Bang was not a white hole. One way to see this is that an FLRW spacetime is homogeneous, whereas a Schwarzschild spacetime has only rotational symmetry. $\endgroup$– user4552Jul 12, 2013 at 18:20
2 Answers
No.
It's only a fictional object that agrees with einstein's formulas. But there is no evidence that that objects exists or had existed.
White hole is possible under General Relativity but violates the second law of thermodynamics. It is thus impossible.
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$\begingroup$ @TMS White hole is a black hole, reversed in time. $\endgroup$– AnixxDec 4, 2012 at 14:47
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1$\begingroup$ Sorry but that doesn't make the answer on violation obvious for me. $\endgroup$– TMSDec 4, 2012 at 17:03
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$\begingroup$ What may be easier to convince oneself of is that it can't form by gravitational collapse (since nothing can fall in). $\endgroup$– user4552Jul 12, 2013 at 18:21
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