Abstract
THE difficulties regarding the physical interpretation of null-geodesics and time-like geodesics inside matter, discussed in a recent letter by Dr. Silberstein1, may be met by recourse to a process analogous to that employed in the classical theory of attractions. Thus, to measure intensity of force at a point in a medium, we carve out a small cavity and measure the force (or acceleration of a free particle) in the cavity.
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NATURE, 138, 1012 (1936).
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SYNGE, J. Geodesics within Matter. Nature 139, 156 (1937). https://doi.org/10.1038/139156b0
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DOI: https://doi.org/10.1038/139156b0
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