How is acceleration absolute? Acceleration can be defined only by reference to an inertial frame: if you have nothing else to which to refer, you're back to the concept of absolute space, which GR rejects.
With respect to linear accelerations, there must be something about the distribution of...
Okay, so I've read Max Born's book twice and believe I now have a reasonable, high-level understanding of general relativity. The thing I'm now trying to tease out is Mach's principle. One thought experiment that I've been falling asleep thinking about is how the presence of distant masses...