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

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21336401w&link_type=abstract

American Astronomical Society, AAS Meeting #213, #364.01; Bulletin of the American Astronomical Society, Vol. 41, p.514

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Cosmic Microwave Background (CMB) polarization measurements at multipoles of l > 20 are unaffected by reionization and are an effective means to probe for cosmological scale electrodynamic parity violation. Using the CMB is particularly attractive because of the long path length to the surface of last scattering, the well-understood physics of the primordial universe that generated the CMB photons, and two cross-spectra, the temperature-curl (TB) and gradient-curl (EB) cross-correlations, that should be null in a parity conserving universe.
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 measuring the rotation of the polarization directions of Cosmic Microwave Background photons. We measure the rotation angle due to such a possible ``cosmological birefringence'' using QUaD's 100 and 150 GHz TB and EB spectra over the multipole range 200QUaD is funded by the National Science Foundation in the USA, the Science and Technology Facilities Council in the United Kingdom, and Science Foundation Ireland. This work is supported by a National Defense Science and Engineering Graduate Fellowship.

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