> Wald, §12.1, footnote 1. That is not describing what you described. > if we do t -> -t, what happens to a perfect absorber, which takes in anything and refl

> Wald, §12.1, footnote 1. That is not describing what you described. > if we do t -> -t, what happens to a perfect absorber, which takes in anything and reflects nothing impinging on it? It becomes a perfect emitter, which emits anything and reflects nothing impinging on it. In other words, a white hole. To put it another way: the inside of a black hole is a region from which nothing can escape and into which everything can fall. The inside of a white hole is a region from which everything can escape and into which nothing can fall. Things coming out of a white hole are escaping from the inside. They aren't reflected. Everything in Wald that you are referencing is describing what I just described. It is not describing what you described.