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Searching for anisotropic cosmic birefringence with polarization data from SPTpol

Bianchini, F. and Wu, W. L. K. and Ade, P. A. R. and Anderson, A. J. and Austermann, J. E. and Avva, J. S. and Balkenhol, L. and Baxter, E. and Beall, J. A. and Bender, A. N. and Benson, B. A. and Bleem, L. E. and Carlstrom, J. E. and Chang, C. L. and Chaubal, P. and Chiang, H. C. and Chou, T. L. and Citron, R. and Moran, C. Corbett and Crawford, T. M. and Crites, A. T. and de Haan, T. and Dobbs, M. A. and Everett, W. and Gallicchio, J. and George, E. M. and Gilbert, A. and Gupta, N. and Halverson, N. W. and Henning, J. W. and Hilton, G. C. and Holder, G. P. and Holzapfel, W. L. and Hrubes, J. D. and Huang, N. and Hubmayr, J. and Irwin, K. D. and Knox, L. and Lee, A. T. and Li, D. and Lowitz, A. and Manzotti, A. and McMahon, J. J. and Meyer, S. S. and Millea, M. and Mocanu, L. M. and Montgomery, J. and Nadolski, A. and Natoli, T. and Nibarger, J. P. and Noble, G. and Novosad, V. and Omori, Y. and Padin, S. and Patil, S. and Pryke, C. and Reichardt, C. L. and Ruhl, J. E. and Saliwanchik, B. R. and Schaffer, K. K. and Sievers, C. and Simard, G. and Smecher, G. and Stark, A. A. and Story, K. T. and Tucker, C. and Vanderlinde, K. and Veach, T. and Vieira, J. D. and Wang, G. and Whitehorn, N. and Yefremenko, V. (2020) Searching for anisotropic cosmic birefringence with polarization data from SPTpol. Physical Review D, 102 (8). Art. No. 083504. ISSN 2470-0010.

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We present a search for anisotropic cosmic birefringence in 500  deg² of southern sky observed at 150 GHz with the SPTpol camera on the South Pole Telescope. We reconstruct a map of cosmic polarization rotation anisotropies using higher-order correlations between the observed cosmic microwave background (CMB) E and B fields. We then measure the angular power spectrum of this map, which is found to be consistent with zero. The nondetection is translated into an upper limit on the amplitude of the scale-invariant cosmic rotation power spectrum, L(L+1)C^(αα)_L/2π < 0.10×10⁻⁴ rad² (0.033  deg², 95% C.L.). This upper limit can be used to place constraints on the strength of primordial magnetic fields, B₁ _(Mpc) < 17  nG (95% C.L.), and on the coupling constant of the Chern-Simons electromagnetic term g_(aγ) < 4.0×10⁻²/H_I (95% C.L.), where H_I is the inflationary Hubble scale. For the first time, we also cross-correlate the CMB temperature fluctuations with the reconstructed rotation angle map, a signal expected to be nonvanishing in certain theoretical scenarios, and find no detectable signal. We perform a suite of systematics and consistency checks and find no evidence for contamination.

Item Type:Article
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URLURL TypeDescription Paper
Bianchini, F.0000-0003-4847-3483
Moran, C. Corbett0000-0003-2088-7465
Additional Information:© 2020 American Physical Society. Received 16 June 2020; accepted 17 August 2020; published 2 October 2020. The authors acknowledge helpful discussions with Dominic Beck, Giulio Fabbian, Toshiya Namikawa, Giuseppe Puglisi, and Caterina Umiltà. S. P. T. is supported by the National Science Foundation through Grants No. PLR-1248097 and No. OPP-1852617. Partial support is also provided by the NSF Physics Frontier Center Grant No. PHY-1125897 to the Kavli Institute of Cosmological Physics at the University of Chicago, the Kavli Foundation, and the Gordon and Betty Moore Foundation Grant No. GBMF 947. This research used resources of the National Energy Research Scientific Computing Center (NERSC), a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. The Melbourne group acknowledges support from the University of Melbourne and an Australian Research Council’s Future Fellowship (FT150100074). B. B. is supported by the Fermi Research Alliance LLC under Contract No. De-AC02-07CH11359 with the U.S. Department of Energy. Work at Argonne National Lab is supported by UChicago Argonne LLC, Operator of Argonne National Laboratory (Argonne). Argonne, a U.S. Department of Energy Office of Science Laboratory, is operated under Contract No. DE-AC02-06CH11357. We also acknowledge support from the Argonne Center for Nanoscale Materials. We acknowledge the use of many PYTHON packages: IPYTHON [91], MATPLOTLIB [92], and SCIPY [93].
Group:TAPIR, Walter Burke Institute for Theoretical Physics
Funding AgencyGrant Number
Kavli FoundationUNSPECIFIED
Gordon and Betty Moore FoundationGBMF 947
Department of Energy (DOE)DE-AC02-05CH11231
Australian Research CouncilFT150100074
Department of Energy (DOE)DE-AC02-07CH11359
Department of Energy (DOE)DE-AC02-06CH11357
Argonne National LaboratoryUNSPECIFIED
Issue or Number:8
Record Number:CaltechAUTHORS:20201006-112037217
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105839
Deposited By: Tony Diaz
Deposited On:07 Oct 2020 00:26
Last Modified:07 Oct 2020 00:26

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