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The idea of a 'super massive white hole' is sometimes discussed regarding GR,SR and the destination of material 'lost' in a black hole. Is there any good theoretical or observational evidence for these SWH, or are they merely metaphysical speculations?

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White holes are a theoretical construction of General Relativity.

Despite extensive searches, nothing has been found: not a supermassive white hole, not a stellar-sized white hole, nothing. Thus, the answer to your question is: on our current knowledge, they don't exist anywhere.

It is unclear how could they be formed. The geometry of the Kerr-solution (i.e. rotating black holes) suggests a white hole could exist on the "other side" of a black hole, but currently it is pure speculation.

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  • $\begingroup$ Would the "other side" be the inside? $\endgroup$
    – userLTK
    Sep 5, 2016 at 7:02
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    $\begingroup$ @userLTK In rotating BH, the singularity is not a point, but it is ring. If the BH is enough big, and your trajectory was choosen enough wisely, you can fall through this ring while you survive. Your worldline can be interpreted as if you would be fallen out in an alternate Minkowski-universe. There are good Penrose-diagrams describing this, so it is totally mainstream science, despite that most of them thinks it as too speculative, non-mainstream. After the CET worktime I will extend it with some references. $\endgroup$
    – peterh
    Sep 5, 2016 at 7:32
  • $\begingroup$ I didn't even think it was a theory, i thought white holes were purely hypothetical at this point. $\endgroup$
    – Logan
    Sep 5, 2016 at 14:03
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    $\begingroup$ @Logan Check this, particularly this - yes they are purely hypothetical, but they are valid solutions of the Einstein Field Equations, and thus they are mainstream physics/astronomy - be back soon. Maybe the topic is a little bit over-mystified by the popular media - I've learned from it from normal scientific sources and thus I was surprised why are they handled often as if it they would be phantasmagory. I think they are like the Hawking-radiation: $\endgroup$
    – peterh
    Sep 5, 2016 at 15:47
  • $\begingroup$ @Logan from the theories it comes out, but there is no experimental proof, thus it remains in the hypothetical, but still mainstream physics area. $\endgroup$
    – peterh
    Sep 5, 2016 at 15:53

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