Can a white hole exist in the universe?

I just encountered this item recently while reading one of the responses to my leading journal entry in Follow the Leader Journal contest on writing.com. Naturally, I had to do an Internet search to find out about this phenomena. Anyway, white holes have something to do with the theory of General Relativity, which is a mathematics-based theory.

In mathematics, white holes appear in the space-time equation around black holes when the mass of the star, which created the black hole is left out. At least, that is how I understand the explanation give at What is a white hole?.

My concern now is not whether a white hole exists in the real universe. My concern is how do I use a white hole in my writing? Is a white hole something I can put in a short story or a poem? This is something I am going to have to consider in my meditation. After all, what use is knowledge if you cannot use it?