How are gravitational waves polarized?
1 Answer
It is a result of the symmetry in the perturbation equation that describes their origination.
Explanation:
The linear-polarization state of the CMB in a direction
http://ned.ipac.caltech.edu/level5/Sept02/Kamionkowski/Kamion2.html
Looking at the geodesic deviation by setting first
http://www.physics.usu.edu/Wheeler/GenRel2013/Notes/GravitationalWaves.pdf
See also:
http://ned.ipac.caltech.edu/level5/Sept02/Kamionkowski/Kamion2.html