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First CMB Constraints on Direction-Dependent Cosmological Birefringence from WMAP-7

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arxiv 1206.5546 v2 pith:EXBQNQ5Q submitted 2012-06-24 astro-ph.CO physics.data-an

Vera Gluscevic , Duncan Hanson , Marc Kamionkowski , Christopher M. Hirata This is my paper
classification astro-ph.COphysics.data-an
keywords cosmologicalrotationbirefringenceacrossangledirection-dependentfieldfirst
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A Chern-Simons coupling of a new scalar field to electromagnetism may give rise to cosmological birefringence, a rotation of the linear polarization of electromagnetic waves as they propagate over cosmological distances. Prior work has sought this rotation, assuming the rotation angle to be uniform across the sky, by looking for the parity-violating TB and EB correlations a uniform rotation produces in the CMB temperature/polarization. However, if the scalar field that gives rise to cosmological birefringence has spatial fluctuations, then the rotation angle may vary across the sky. Here we search for direction-dependent cosmological birefringence in the WMAP-7 data. We report the first CMB constraint on the rotation-angle power spectrum for multipoles between L = 0 and L = 512. We also obtain a 68% confidence-level upper limit of 1 degree on the square root of the quadrupole of a scale-invariant rotation-angle power spectrum.

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Cited by 3 Pith papers

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