If you are a non-specialist:
ABSTRACT
We search for evidence of parity-violating physics in the Planck 2018 polarization data and report on a new measurement of the cosmic birefringence angle
β. The previous measurements are limited by the systematic uncertainty in the absolute polarization angles of the Planck detectors. We mitigate this systematic uncertainty completely by simultaneously determining
β and the angle miscalibration using the observed cross-correlation of the E- and B-mode polarization of the cosmic microwave background and the Galactic foreground emission. We show that the systematic errors are effectively mitigated and achieve a factor-of-2 smaller uncertainty than the previous measurement, finding
β=0.35±0.14 deg (68% C.L.), which excludes β=0
at 99.2% C.L. This corresponds to the statistical significance of 2.4σ.
I am not sure what space.com is, but I figure if you post it and eppur_se_muova recommends it, it must be respectable enough. I know space.com was founded by Lou Dobbs but that in itself doesn't make its content suspect. I saw that a few years ago which made me a bit dubious about being on their mailing list. But Mara Johnson-Groh writes for Nasa so I would assume her synopsis is accurate.
It must be a fairly difficult job to write synopses of articles like these for laymen.
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