Hi everybody. This will be my first post here on PF. :) I'm wondering about the mechanism by which mass causes space to warp and curve within General Relativity. I did a cursory search on the subject and did come across some brief discussion here from a few years ago. At the time, the question was posed as "why does mass curve space," and so most responses were explaining that science is not about "why." So to be clear, I'm wondering HOW mass affects space-time - that is to say, the mechanism by which the presence of mass alters the geometry of space-time. Is there any information or thinking on this subject you could share?