Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-05-06
Phys.Rev.D76:123014,2007
Astronomy and Astrophysics
Astrophysics
7 pages, 4 figures, some modifications to match accepted (PRD) version, results unchanged
Scientific paper
10.1103/PhysRevD.76.123014
We perform a wavelet analysis of the temperature and polarization maps of the Cosmic Microwave Background (CMB) delivered by the WMAP experiment in search for a parity violating signal. Such a signal could be seeded by new physics beyond the standard model, for which the Lorentz and CPT symmetries may not hold. Under these circumstances, the linear polarization direction of a CMB photon may get rotated during its cosmological journey, a phenomenon also called cosmological birefringence. Recently, Feng et al. have analyzed a subset the WMAP and BOOMERanG 2003 angular power spectra of the CMB, deriving a constraint that mildly favors a non zero rotation. By using wavelet transforms we set a tighter limit on the CMB photon rotation angle \Delta\alpha= -2.5 \pm 3.0 (\Delta\alpha= -2.5 \pm 6.0) at the one (two) \sigma level, consistent with a null detection.
Cabella Paolo
Natoli Paolo
Silk Joseph
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