Parity violation constraints using cosmic microwave background polarization spectra from 2006 and 2007 observations by the QUaD polarimeter

Research output: Contribution to journalArticle

  • External authors:
  • G. Cahill
  • P. G. Castro
  • S. Church
  • T. Culverhouse
  • R. B. Friedman
  • K. Ganga
  • 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


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<

Bibliographical metadata

Original languageEnglish
Article number161302
JournalPhysical Review Letters
Issue number16
Publication statusPublished - 21 Apr 2009