Institute of Astronomy

Exploring Gravitational forces via thought experiments

SpeakerTalk DateTalk Series
Donald Lynden-Bell, IoA19 March 2015Institute of Astronomy Colloquia

Abstract

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.

Presentation

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