From my basic understanding of White Holes they are said to be the other end of a black hole right? A black hole sucks matter in and spews it out into another universe via a wormhole. I believe that idea was thought up by Schwarzschild? And the wormhole joining the two separate Universes is known as the Einstein-Rosen bridge?
If a black hole is emptying its matter into another universe wouldn't it quickly disappear unless it was constantly being fed large amounts of matter? And how could the event horizon grow and make SMBH's if this matter was being ejected constantly?
Or does any of this even matter? I have seen a few other articles that say white holes can't exist anyway because they violate the second law of thermodynamics.