Part V · Dynamics · Paper 24 of 40
“The elastic wave equation admits the transverse-traceless family exactly, reproducing the plus and cross polarizations and the Hellings-Downs correlation.”
The wave sector derived from the postulates and verified symbolically. The transverse branch runs at c by construction of the shear modulus; what a source can and cannot emit follows, and so does the separation of the two kinds of gravitational wave.