Cosmic birefringence from the Planck data release 4
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Diego Palazuelos, Patricia; Eskilt, Johannes Røsok; Minami, Yasui; Trsitam, Matthieu; Sullivan, Raelyn M.; Banday, A. J.; Barreiro Vilas, Rita Belén; Eriksen, Hans Kristian Kamfjord; Górski, Krzysztof M.; Keskitalo, Reijo; Komatsu, Eiichiro; Martínez González, Enrique; Scott, Douglas; Vielva Martínez, Patricio; Wehus, Ingunn KathrineFecha
2022-03-01Derechos
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license.
Publicado en
Physical Review Letters, 2022, 128(9), 091302
Editorial
American Physical Society
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Resumen/Abstract
We search for the signature of parity-violating physics in the cosmic microwave background, called
cosmic birefringence, using the Planck data release 4. We initially find a birefringence angle of
B= 0.30° + - 0.11° (68% C.L.) for nearly full-sky data. The values of B decrease as we enlarge the
Galactic mask, which can be interpreted as the effect of polarized foreground emission. Two independent
ways to model this effect are used to mitigate the systematic impact on B for different sky fractions. We
choose not to assign cosmological significance to the measured value of B until we improve our knowledge
of the foreground polarization.
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