Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1926
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1926natur.117..300l&link_type=abstract
Nature, Volume 117, Issue 2939, pp. 300 (1926).
Astronomy and Astrophysics
Astronomy
Scientific paper
RADIATION of amount δE, lost by a body, diminishes its effective mass, on Maxwellian principles, by δE/c2: and some perplexity is apparent in recent discussion as to how this tells on the dynamical inertia of a planetary mass. According to the Newtonian doctrine, it is the rate of change of momentum mv which must be equated to the extraneous gravitational or electric force acting on the body: and this principle was taken over by Einstein, in extended fourfold form and in concert with relativity, as the key to his brilliant tentative explorations towards a closer view of gravitation. But so that if the mass is diminishing by radiation, conservation of momentum seems to demand acceleration of velocity of a body isolated and so free from external force. Yet the doctrine of relativity asserts that no standard can exist on which to measure such change of velocity, whether of translation or rotation: such a conclusion therefore would contradict relativity. On this ground it is claimed that the applied force must be equated, following Dr. Jeans, to and not to. Yet the latter form is based directly on a very keystone of relativity. One way out of the apparent paradox would be to postulate a frame in the ether with reference to which the velocity of an isolated body could be measured: this would institute an exception to accepted doctrine widely verified. Prof. E. W. Brown (Proc. U.S. National Academy, 1926, p. 2) appears to be troubled, and naturally so, by uncertainty as to which formula to adopt with a view to studies on cumulative long-range effects of radiation in dynamical astronomy.
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