- References
In general relativity, the quadrupole formula describes the rate at which gravitational waves are emitted from a system of masses based on the change of the (mass) quadrupole moment. The formula reads
where 
: the spatial part of the trace reversed perturbation of the metric, i.e. the gravitational wave, and 
is the mass quadrupole moment.[1]
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).[2]
References
1. ^{{cite book|title=Spacetime and Geometry|first=Sean M.|last=Carroll|publisher=Pearson/Addison Wesley|isbn=978-0805387322|pages=300–307|year=2004}}
2. ^{{cite book|title=Gravity:Newtonian, Post-Newtonian, Relativistic|first1=Eric|last1=Poisson|first2=Clifford M.|last2=Will|publisher=Cambridge University Press|isbn=9781107032866|pages=550–563|date=2014-05-29}}
{{Einstein}}{{Relativity}}2. ^{{cite book|title=Gravity:Newtonian, Post-Newtonian, Relativistic|first1=Eric|last1=Poisson|first2=Clifford M.|last2=Will|publisher=Cambridge University Press|isbn=9781107032866|pages=550–563|date=2014-05-29}}
4 : General relativity|Gravitational-wave astronomy|Equations of physics|Albert Einstein
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