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How do white holes form? No physical process which would form a white hole is known. What's an "eternal" black hole? This is exactly the only speculated way a white hole could exist and not violate known physical laws - it would have to be here "since always" with it's eternal black hole counterpart. Because it cannot form dynamically, there ...


A white hole isn't formed. This is the definition. If $t$ is cosmic time, then a white hole is black hole that existed at $t=-\infty$. Take a look at this Penrose diagram. (Ignore the parallel universe piece.) The corner where $r=0$ and $r=\infty$ meets is called the past timelike infinity. We see that the white hole existed at that time. For a universe ...

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