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arXiv · 0705.0810

Constraints on CPT violation from WMAP three year polarization data: a wavelet analysis

Paolo Cabella·Paolo Natoli·Joseph Silk
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Abstract

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 Δα= -2.5 \pm 3.0 (Δα= -2.5 \pm 6.0) at the one (two) σlevel, consistent with a null detection.

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Paolo Cabella, Paolo Natoli, Joseph Silk. 2007-11-12. Constraints on CPT violation from WMAP three year polarization data: a wavelet analysis. https://doi.org/10.1103/physrevd.76.123014

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