There's a long history of mathematicians working on general relativity; in fact, for decades general relativity was mostly the purview of mathematics, not physi

There's a long history of mathematicians working on general relativity; in fact, for decades general relativity was mostly the purview of mathematics, not physics, due to (1) the difficulty in finding exact solutions to the Einstein field equations and (2) their lack of physical meaning (eg, the Taub-NUT solution: https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19660007407.pdf https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/196600...).