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Quadrupole formula
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Quadrupole formula : ウィキペディア英語版
Quadrupole formula
In general relativity, the quadrupole formula describes rate at which gravitational waves are emitted from a system of masses based on the change of the (mass) quadrupole moment. The formula reads
: \bar_(t,r) = \frac \ddot_(t-r),
where \bar_ is the (spatial part of) the trace reversed perturbation of the metric (i.e. the gravitational wave), and I_ is the mass quadrupole moment.
The formula was first obtained by Albert Einstein in 1916. After a long history of debate on its physical correctness, observations of energy loss due to gravitational radiation in the Hulse–Taylor binary discovered in 1974 confirmed the result, with agreement up to 0.2 percent (by 2005).
==References==



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