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Originally Posted by upriver
Yes, where does inertia come from in GR? What is the mechanical cause?
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My particular take on Einstein's etheric model of GR would not be welcome here. Since this is not the ATM subforum, we will have to let a GR conventionalist explain how inertia arises.
Inertia was one of Feynman's favorite examples when he was explaining the difference between what we "know" and what we "understand", so I'm looking forward to the concordance answer.
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The ether of general relativity therefore differs from that of classical mechanics or the special theory of relativity respectively, in so far as it is not 'absolute', but is determined in its locally variable properties by ponderable matter.
Albert Einstein, "On the Ether", 1924
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