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Published June 24, 2010 | Published
Journal Article Open

Testing parity-violating mechanisms with cosmic microwave background experiments


Chiral gravity and cosmological birefringence both provide physical mechanisms to produce parity-violating TB and EB correlations in the cosmic microwave background (CMB) temperature/polarization. Here, we study how well these two mechanisms can be distinguished if nonzero TB/EB correlations are found. To do so, we evaluate the correlation matrix, including new TB-EB covariances. We find that the effects of these two mechanisms on the CMB are highly orthogonal, and can thus be distinguished fairly well in the case of a high-signal-to-noise detection of TB/EB correlations. Appendix evaluates the relative sensitivities of the BB, TB, and EB signals for detecting a chiral gravitational-wave background.

Additional Information

© 2010 The American Physical Society. Received 5 February 2010; published 24 June 2010. V. G. thanks Timothy Morton for useful comments. This work was supported by DoE DE-FG03-92-ER40701 and the Gordon and Betty Moore Foundation.

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Published - Gluscevic2010p10622Phys_Rev_D.pdf


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