publications.ias.edu/sites/default/files/…

publications.ias.edu/sites/default/files/…

How does this solution come from a Cauchy problem? By the way your first term should have $dt$, right?

You would need to learn some PDE, the initial value problem and the characteristic problem in GR.

You should post the question only on one site and wait a bit before you ask somewhere else.

The automorphic wave equation.

No, I am asking whether that volume exists. That is objective, not personal, and many people, besides the author, could answer that.

@RyanBudney I suppose you are right, but doesn't your comment apply to all reference questions about papers/books with a living arthor.

This is not what you are asking for, but have looked at the older papers by Christodoulou. He gives a mathematically sound statement of the weak conjecture and proves it in the case of scalar field and spherical symmetry?