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Tensor perturbations are represented by Laplacian eigenfunctions
which satisfy a transverse-traceless condition
that forbids the construction of scalar and vector objects
such as density and velocity fields. The modes take on
an explicit representation of
and thus tensors stimulate the
modes in the radiation.
In the following sections, we often only explicitly show
the positive m value with the understanding that its opposite
takes on the same form except where otherwise noted (i.e. in
the B-type polarization where a sign reversal occurs).