While reading about a White holes, I stumbled upon a question "Where does the matter emitted by a White hole come from?" There seems to be 2 possible candidates:
- It was the matter engulfed by a Black hole.
- Matter was created inside the White hole.
My search on wiki stated that:
According to Penrose Diagram of Schwarzschild radius, objects first leave the White hole and then may enter into a Black hole. But, due to Hawking radiation, a Black hole can achieve thermal equilibrium with gas of radiation. This equilibrium state is reversal invariant, implying that time reversal of a Black hole is again a Black hole. This means that a Black hole and a White hole are same objects.
My 2nd candidate suggests that the big-bang was a white hole. I thought of ruling this out because it requires the existence of a white hole before the big-bang.
This forced me to draw the conclusion that a white hole must either be inside a black hole or behind it.
Is this correct (provided that we haven't yet proven the existence of a White hole)? Where am I wrong?