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Exploring Gravitational forces via thought experiments

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The accelerating universe is driven apart by the gravitational repulsion caused by the tension (negative pressure) of dark energy. I devise a series of thought experiments to illustrate how the gravity not of density but of stress works in General Relativity. I also illustrate the gravitational forces due to currents of energy, momentum, and angular momentum. There are strong analogies with the Lorentz forces in electromagnetism.

This talk is part of the Institute of Astronomy Colloquia series.

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