Journal article

POLARBEAR constraints on cosmic birefringence and primordial magnetic fields

Peter AR Ade, Kam Arnold, Matt Atlas, Carlo Baccigalupi, Darcy Barron, David Boettger, Julian Borrill, Scott Chapman, Yuji Chinone, Ari Cukierman, Matt Dobbs, Anne Ducout, Rolando Dunner, Tucker Elleflot, Josquin Errard, Giulio Fabbian, Stephen Feeney, Chang Feng, Adam Gilbert, Neil Goeckner-Wald Show all



We constrain anisotropic cosmic birefringence using four-point correlations of even-parity E-mode and odd-parity B-mode polarization in the cosmic microwave background measurements made by the POLARization of the Background Radiation (POLARBEAR) experiment in its first season of observations. We find that the anisotropic cosmic birefringence signal from any parity-violating processes is consistent with zero. The Faraday rotation from anisotropic cosmic birefringence can be compared with the equivalent quantity generated by primordial magnetic fields if they existed. The POLARBEAR nondetection translates into a 95% confidence level (C.L.) upper limit of 93 nanogauss (nG) on the amplitude of a..

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University of Melbourne Researchers


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Funding Acknowledgements

Calculations were performed on the Gordon supercomputer operated for the Extreme Science and Engineering Discovery Environment by the San Diego Supercomputer Center and the Edison supercomputer by the National Energy Research Scientific Computing, supported by the Department of Energy under Contract No. DE-AC02-05CH11231. The POLARBEAR project is funded by the National Science Foundation under Grants No. AST-0618398 and No. AST-1212230. The KEK authors were supported by MEXT KAKENHI Grants No. 21111002 and No. 26220709, and acknowledge support from KEK Cryogenics Science Center. This work was supported by the JSPS Core-to-Core Program (A. Advanced Research Networks). The McGill authors acknowledge funding from the Natural Sciences and Engineering Research Council and Canadian Institute for Advanced Research. L. P. and Y. L. are supported by a Discovery Grant from NSERC. The James Ax Observatory operates in the Parque Astronomico Atacama in Northern Chile under the auspices of the Comision Nacional de Investigacion Cientifica y Tecnologica de Chile (CONICYT). K. A. acknowledges support from the Simons Foundation. C. F. acknowledges support from NSF Grant No. AST-1313319 and the Ax Center for Experimental Cosmology. C. R. acknowledges support from the University of Melbourne. C. B., G. F., and G. P. acknowledge partial support from the INDARK INFN Network. D. B. is supported by a NSF Astronomy and Astrophysics Postdoctoral Fellowship under Grant No. AST-1501422. We are grateful to Marc Kamionkowski and Vera Gluscevic for the insights and suggestions that helped inspire this work.