Aghanim, N;
Ashdown, M;
Aumont, J;
Baccigalupi, C;
Ballardini, M;
Banday, AJ;
Barreiro, RB;
... Zonca, A; + view all
(2016)
Planck intermediate results XLIX. Parity-violation constraints from polarization data.
Astronomy & Astrophysics
, 596
, Article A110. 10.1051/0004-6361/201629018.
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Abstract
Parity-violating extensions of the standard electromagnetic theory cause in vacuo rotation of the plane of polarization of propagating photons. This effect, also known as cosmic birefringence, has an impact on the cosmic microwave background (CMB) anisotropy angular power spectra, producing non-vanishing T–B and E–B correlations that are otherwise null when parity is a symmetry. Here we present new constraints on an isotropic rotation, parametrized by the angle α, derived from Planck 2015 CMB polarization data. To increase the robustness of our analyses, we employ two complementary approaches, in harmonic space and in map space, the latter based on a peak stacking technique. The two approaches provide estimates for α that are in agreement within statistical uncertainties and are very stable against several consistency tests.Considering the T–B and E–B information jointly, we find from the harmonic analysis and from the stacking approach. These constraints are compatible with no parity violation and are dominated by the systematic uncertainty in the orientation of Planck’s polarization-sensitive bolometers.
| Type: | Article |
|---|---|
| Title: | Planck intermediate results XLIX. Parity-violation constraints from polarization data |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1051/0004-6361/201629018 |
| Publisher version: | http://dx.doi.org/10.1051/0004-6361/201629018 |
| Additional information: | © ESO, 2016 |
| Keywords: | cosmology: observations / cosmic background radiation / cosmological parameters / methods: data analysis / methods: statistical |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1524170 |
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