QuoteIn 1918 Einstein published the paper ÜBER GRAVITATIONSWELLEN  in which, for the first time, the effect ofgravitational waves was calculated, resulting in his famous quadrupole formula (QF). Einstein was forced to thispublication due to a serious error in his 1916 paper , where he had developed the linear approximation (weakfield)scheme to solve the field equations of general relativity (GR). In analogy to electrodynamics, whereaccelerated charges emit electromagnetic waves, the linearized theory creates gravitational waves, popagatingwith the speed of light in the (background) Minkowski space-time. A major difference: Instead of a dipolemoment, now a quadrupole moment is needed. Thus sources of gravitational waves are objects like a rotatingdumbbell, e. g. realized by a binary star system.
Last edited by Cuchulainn
on February 11th, 2016, 11:00 pm, edited 1 time in total.