QUESTIONS. “The phenomenon under discussion is two-faced. On one hand, it shows that high energy processes are indeed possible due to white holes and poses anew the question about their potential role in nature. From the other hand, it poses also a question about backreaction of such collisions on the metric itself, including the fate of white holes.”
https://link.springer.com/article/10.1007/s10714-020-02761-4