Gravity waves of curvature made in cosmic inflation will polarize the real photons in the cosmic background microwave radiation from 380,000 years after the hot Big Bang, however:
"Gravitational Radiation Can Be Produced More Than One Way
ScienceDaily (Apr. 17, 2008) — A team of researchers from Case Western Reserve University has found that gravitational radiation—widely expected to provide "smoking gun" proof for a theory of the early universe known as "inflation"—can be produced by another mechanism."
There is a serious conceptual error made by the science journalist in the article. See if you can find it.