期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 6, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2016/06/001
关键词
CMBR polarisation; cosmological parameters from CMBR; CMBR theory
资金
- ASI/INAF [2014-024-R.0, 2014-024-R.1]
- research grant Theoretical Astroparticle Physics number 2012CPPYP7 under the program PRIN - MIUR [2012CPPYP7]
- TASP
The polarization of cosmic microwave background (CMB) can be used to constrain cosmological birefringence, the rotation of the linear polarization of CMB photons potentially induced by parity violating physics beyond the standard model. This effect produces non null CMB cross correlations between temperature and B mode-polarization, and between E-and B-mode polarization. Both cross-correlations are otherwise null in the standard cosmological model. We use the recently released 2015 PLANCK likelihood in combination with the Bicep2/Keck/Planck (BKP) likelihood to constrain the birefringence angle a. Our findings, that are compatible with no detection, read alpha = 0.0 degrees +/- 1.3 degrees (stat) +/- 1 degrees (sys) for PLANCK data and alpha = 0.30 degrees +/- 0.27 degrees (stat) +/- 1 degrees (sys) for BKP data. We finally forecast the expected improvements over present constraints when the PLANCK BB, TB and EB spectra at high l will be included in the analysis.
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