A simple model of an electric quadrupole.
A line integral convolution of the electric field lines of the azimuthally symmetric static electric quadrupole described in the text.
A simple model of a gravitational quadrupole.
Line integral convolutions showing the eigenvector fields for the vertically oriented static gravitational point quadrupole. The top image shows the field for negative eigenvalues, and the bottom image shows the field for positive eigenvalues.
Electric flux E through an area whose boundary is moving with velocity v.
A line integral convolution snapshot of the field of an oscillating electric quadrupole [Eqs. (24) and (25) , with t = 0]. The markers show points that are one wavelength (cT) from the origin. At distances from the origin small compared to one wavelength, the solutions approach those of the static solutions shown in Fig. 2 . A movie of this radiating quadrupole is available online and as supplementary material 25 (enhanced online)]. [URL: http://dx.doi.org/10.1119/1.4807853.1]doi: 10.1119/1.4807853.1.
Line integral convolution snapshots of the eigenlines of the gravitoelectric field of an oscillating point gravitational quadrupole described by Eqs. (29) , (30) , and (32) at time t = 0. The markers show points that are one wavelength (cT) from the origin. The top image shows the eigenlines for one family 26 of eigenvectors; the bottom image shows the other family. At distances from the origin small compared to the wavelength, the fields, and hence the eigenlines, approach those of the two families of eigenlines for the static solution shown in Fig. 4 . Movies for this radiating quadrupole are available online and as supplementary material 25 (enhanced online)]]. [URL: http://dx.doi.org/10.1119/1.4807853.2] [URL: http://dx.doi.org/10.1119/1.4807853.3]doi: 10.1119/1.4807853.2.
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