On a mechanical interpretation of the null geodesics in static Einstein-Riemann spaces.

by T. Y. Thomas, Dominic G. B. Edelen

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A discussion of the Einstein general theory of relativity as the most widely accepted theory for describing gravitational phenomena. However, this theory is not as simple as might be desired, and a full understanding of its implications is not easily acquired. This memorandum gives those intuitively elusive objects, "null geodesics," a mechanical interpretation which may help to explain them in terms of more concrete quantities. The study shows that the normal trajectories to any moving, two-dimensional surface which carries a mechanical disturbance through a material body are the projections into that body of light rays in an Einstein-Riemann space whose local velocity of light is equal to the normal velocity of the surface through the material body at corresponding points.

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