A Caltech Library Service

First CMB constraints on direction-dependent cosmological birefringence from WMAP-7

Gluscevic, Vera and Hanson, Duncan and Kamionkowski, Marc and Hirata, Christopher M. (2012) First CMB constraints on direction-dependent cosmological birefringence from WMAP-7. Physical Review D, 86 (10). Art. No. 103529. ISSN 2470-0010.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


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 that a uniform rotation produces in the cosmic microwave background 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 cosmic microwave background constraint on the rotation-angle power spectrum C^(αα)_L for multipoles between L=0 and L=512. We also obtain a 68% confidence-level upper limit of √(C^(αα)_(2)/(4π))≲1° on the quadrupole of a scale-invariant rotation-angle power spectrum.

Item Type:Article
Related URLs:
URLURL TypeDescription
Kamionkowski, Marc0000-0001-7018-2055
Hirata, Christopher M.0000-0002-2951-4932
Additional Information:© 2012 American Physical Society. Received 24 June 2012; published 26 November 2012. This work was supported by DOE DE-FG03-92-ER40701, NASA NNX12AE86G, DOE (DOE.DESC0006624), and the David and Lucile Packard Foundation. Part of the research described in this paper was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. Some of the results in this paper have been derived using the HEALPix package.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG03-92-ER40701
Department of Energy (DOE)DE-SC0006624
David and Lucile Packard FoundationUNSPECIFIED
Issue or Number:10
Classification Code:PACS: 98.80.Cq, 98.70.Vc
Record Number:CaltechAUTHORS:20130115-101234907
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36383
Deposited By: Jason Perez
Deposited On:15 Jan 2013 21:51
Last Modified:03 Oct 2019 04:37

Repository Staff Only: item control page