Abstract
An analysis is given of the problem of defining observables, i.e., quantities which can be measured by actual observers. The notion of fundamental observables is introduced; these are obtained by the projection of tensors into the reference system of observers falling freely in a gravitational field. The significance of these concepts is illustrated by means of an example, wherein the gravitational field of a static spherically symmetric source is analyzed.
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In conclusion, I am deeply grateful to V. I. Rodichev and G. I. Zadonskii for very interesting conversations on the subject discussed here.
Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, Vol. 16, No. 9, pp. 103–107, September, 1973.
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Dozmorov, I.M. Observables in a schwarzchild field. Soviet Physics Journal 16, 1277–1279 (1973). https://doi.org/10.1007/BF00890895
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DOI: https://doi.org/10.1007/BF00890895