期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 9, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2022/09/075
关键词
CMBR polarisation; CMBR theory
资金
- INFN InDark initiative
- COSMOS network through the ASI (Italian Space Agency) [2016-24-H.0, 2016-24-H.1-2018, 2020-9-HH.0]
The study utilizes Planck Legacy and NPIPE products to build low resolution Cosmic Birefringence (CB) angle maps, providing for the first time estimates of the cross-correlation between CB and CMB polarization fields, with no evidence of CB found.
Cosmic Birefringence (CB) is the in-vacuo rotation of the linear polarization direction of photons during propagation, caused by parity-violating extensions of Maxwell electromagnetism. We build low resolution CB angle maps using Planck Legacy and NPIPE products and provide for the first time estimates of the cross-correlation spectra C alpha E L and C alpha B L between the CB and the CMB polarization fields. We also provide updated CB auto-correlation spectra C alpha alpha L as well as the cross-correlation CL alpha T with the CMB temperature field. We report constraints by defining the scale-invariant amplitudes A alpha X -L(L + 1)C alpha X L /27r, where X = alpha, T, E, B, finding no evidence of CB. In particular, we find A alpha E = (-7.8 +/- 5.6) nK deg and A alpha B = (0.3 +/- 4.0) nK deg at 68% C.L..
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