English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

New extraction of the cosmic birefringence from the Planck 2018 polarization data

MPS-Authors
/persons/resource/persons250923

Komatsu,  Eiichiro
Physical Cosmology, MPI for Astrophysics, Max Planck Society;

External Resource
No external resources are shared
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Minami, Y., & Komatsu, E. (2020). New extraction of the cosmic birefringence from the Planck 2018 polarization data. Physical Review Letters, 125(22): 221301. doi:10.1103/PhysRevLett.125.221301.


Cite as: http://hdl.handle.net/21.11116/0000-0007-E1EE-F
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.