If the only evidence for dark matter we have is gravitational, why call it 'matter' rather than 'observed space-time geometry that does not match predictions'?
General Relativity tells us that mass distorts local space-time but as far as I know, it doesn't say that it is the only thing that does so - isn't for all we know space-time is more fundamental than mass and can have local distortions caused by the big bang / inflationary epoch / flying-spaghetti-monster blueprints?
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