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Physical Review Letters 102 (2009) 161302
Parity Violation Constraints Using Cosmic Microwave Background Polarization Spectra from 2006 and 2007 Observations by the QUaD Polarimeter
E.Y.S. Wu, P. Ade, J. Bock, M. Bowden, M. L. Brown, G. Cahill, P. G. Castro, S. Church, T. Culverhouse, R. B. Friedman, K. Ganga1, W. K. Gear, S. Gupta, J. Hinderks, J. Kovac, A. E. Lange, E. Leitch, S. J. Melhuish, Y. Memari, J. A. Murphy, A. Orlando, L. Piccirillo, C. Pryke, N. Rajguru, B. Rusholme, R. Schwarz, C. O'Sullivan, A. N. Taylor, K. L. Thompson, A. H. Turner, M. Zemcov
QUaD Collaboration(s)

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 cosmic microwave background photons. We measure the rotation angle due to such a possible "cosmological birefringence" to be 0.55°±0.82° (random) ±0.5° (systematic) using QUaD's 100 and 150 GHz temperature-curl and gradient-curl spectra over the spectra over the multipole range 200<ℓ<2000, consistent with null, and constrain Lorentz-violating interactions to <2×10-43GeV (68% confidence limit). This is the best constraint to date on electrodynamic parity violation on cosmological scales.
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
APC - Cosmologie et Gravitation
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique

Physique/Physique des Hautes Energies - Phénoménologie
Background radiations – Charge conjugation – parity – time reversal – and other discrete symmetries – Radio – microwave – Observational cosmology
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