期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2012/02/023
关键词
CMBR polarisation; CMBR experiments; cosmological parameters from CMBR; CMBR theory
资金
- NASA Office of Space Science
- ASI through ASI/INAF [I/072/09/0]
We constrain the rotation angle alpha of the linear polarization of CMB photons using the large angular scale (up to similar to 4 degrees) signal in WMAP 7 year data. At these scales, the CMB polarization pattern probes mostly the reionization era. A genuine rotation may be interpreted as cosmological birefringence, which is a well known tracer of new physics, through the breakdown of fundamental symmetries. Our analysis provides alpha = -1.6 degrees +/- 1.7 degrees (3.4 degrees) at 68% (95%) C.L. for the multipoles range Delta l = 2-47 not including an instrumental systematic uncertainty that the WMAP team estimates at +/- 1.5 degrees. This improves the bound obtained by WMAP team (Komatsu et al., 2010). Moreover we show, for the first time at low multipoles, the angular power spectrum alpha(l) in search of a possible scale dependence of the birefringence effect. Our findings are compatible with no detection at all angular scales probed here. We finally forecast the capabilities of Planck in tightening the present constraints
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