Parity violation constraints using 2006-2007 QUaD CMB polarization spectra

Details Parity violation constraints using 2006-2007 QUaD CMB polarization spectra Parity violation constraints using 2006-2007 QUaD CMB polarization spectra

2008-11-04

arxiv.org/abs/0811.0618v4

Phys.Rev.Lett.102:161302,2009

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, accepted to Physical Review Letters. Improved method, updated result and clarified language

Scientific paper

10.1103/PhysRevLett.102.161302

We constrain parity-violating interactions to the surface of last scattering using spectra from the QUaD experiment's second and third seasons of observations by searching for a possible systematic rotation of the polarization directions of CMB photons. We measure the rotation angle due to such a possible "cosmological birefringence" to be 0.55 deg. +/- 0.82 deg. (random) +/- 0.5 deg. (systematic) using QUaD's 100 and 150 GHz TB and EB spectra over the multipole range 200 < l < 2000, consistent with null, and constrain Lorentz violating interactions to < 2^-43 GeV (68% confidence limit). This is the best constraint to date on electrodynamic parity violation on cosmological scales.

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