Philip Mannheim: Dark Matter and General Relativity Explained FROM SCRATCH

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This is Part One of a lecture where, as with Tim Maudlin, the professor was given unlimited time, so you can pause and check the derivations yourself. Philip Mannheim, professor of physics at the University of Connecticut, joins to explain why he traces dark matter, dark energy and quantum gravity to one cause: stretching Newton and Einstein beyond the solar system. We discuss the planet Vulcan that was never there, why dwarf galaxies are a bigger clue than spirals, the Tully-Fisher relation, and his fits to 138 galaxies with no dark matter. The conversation also covers general relativity from scratch, from metrics to the Riemann tensor, and whether Einstein’s equations are unique. Part Two is still to come.

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