the math is written out all the time, pick up decent grad level GR and QM textbooks and the tensor equations will be right there for you. the fact you don't understand the math isn't the fault of the evil physicists
The math relevant to OP is accessible via the second link in the text: https://arxiv.org/pdf/2508.21748 I guess you might have to follow some citations too. But we were on a tangent about white holes, which would be unreasonable to expect in the article. I and the other reply have already told you where to find that math.
