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New constraints on cosmic polarization rotation from the ACTPol cosmic microwave background B-Mode polarization observation and the BICEP2 constraint update | | Hsien-Hao Mei
; Wei-Tou Ni
; Wei-Ping Pan
; Lixin Xu
; Sperello di Serego Alighieri
; | | Date: |
30 Dec 2014 | | Abstract: | Recently ACTPol has measured the cosmic microwave background (CMB) B-mode and
E-mode polarizations and obtained TE, EE, BB, TB and EB power spectra in the
multipole range 225-8725, detecting six peaks and six troughs of acoustic
oscillation in both the TE and EE correlation power spectrum giving independent
empirical support to the {Lambda}CDM cosmology. In our previous paper (di
Serego Alighieri, Ni and Pan, Ap. J. 792 (2014) 35 [Paper I]), we have analyzed
jointly the results of three experiments on the CMB B-mode polarization --
SPTpol, POLARBEAR and BICEP2 to include in the model, in addition to the
gravitational lensing and the inflationary gravitational waves components, also
the fluctuation effects induced by the cosmic polarization rotation (CPR), if
it exists within the upper limits at the time. In this paper, we fit both the
mean CPR angle <{alpha}> and its fluctuation <{delta}{alpha}^2> from the
ACTPol data, and update our fitting of CPR fluctuations using BICEP2 data
taking the Planck dust measurement results into consideration. We follow the
method of Paper I. Mean CPR angle is constrained from the EB correlation power
spectra to |<{alpha}>| < 14 mrad (0.8{deg}) and the fluctuation (rms) is
constrained from the BB correlation power spectra to <{delta}{alpha}^2>^(1/2)
< 29.3 mrad (1.68{deg}). Assuming that the polarization angle of Tau A does
not change from 89.2 to 146 GHz, the ACTPol data give <{alpha}> = 1.0 {pm}
0.63{deg}. These results suggest that the inclusion of the present ACTPol data
is consistent with no CPR detection. With the PLANCK dust measurement, we
update our fits of the BICEP2 CPR constraint to be 32.8 mrad (1.88{deg}). The
joint ACTpol-BICEP2-POLARBEAR CPR constraint is 23.7 mrad (1.36{deg}). | | Source: | arXiv, 1412.8569 | | Services: | Forum | Review | PDF | Favorites | |
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