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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
physics and astronomy
Self-calibration of BICEP1 three-year data and constraints on astrophysical polarization rotation
Physical Review D - Particles, Fields, Gravitation and Cosmology, Volume 89, No. 6, Article 062006, Year 2014
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Description
Cosmic microwave background (CMB) polarimeters aspire to measure the faint B-mode signature predicted to arise from inflationary gravitational waves. They also have the potential to constrain cosmic birefringence, rotation of the polarization of the CMB arising from parity-violating physics, which would produce nonzero expectation values for the CMB's temperature to B-mode correlation (TB) and E-mode to B-mode correlation (EB) spectra. However, instrumental systematic effects can also cause these TB and EB correlations to be nonzero. In particular, an overall miscalibration of the polarization orientation of the detectors produces TB and EB spectra which are degenerate with isotropic cosmological birefringence, while also introducing a small but predictable bias on the BB spectrum. We find that Bicep1 three-year spectra, which use our standard calibration of detector polarization angles from a dielectric sheet, are consistent with a polarization rotation of α=-2.77°±0.86°(statistical)±1.3°(systematic). We have revised the estimate of systematic error on the polarization rotation angle from the two-year analysis by comparing multiple calibration methods. We also account for the (negligible) impact of measured beam systematic effects. We investigate the polarization rotation for the Bicep1 100 GHz and 150 GHz bands separately to investigate theoretical models that produce frequency-dependent cosmic birefringence. We find no evidence in the data supporting either of these models or Faraday rotation of the CMB polarization by the Milky Way galaxy's magnetic field. If we assume that there is no cosmic birefringence, we can use the TB and EB spectra to calibrate detector polarization orientations, thus reducing bias of the cosmological B-mode spectrum from leaked E-modes due to possible polarization orientation miscalibration. After applying this "self-calibration" process, we find that the upper limit on the tensor-to-scalar ratio decreases slightly, from r<0.70 to r<0.65 at 95% confidence. © 2014 American Physical Society.
Authors & Co-Authors
Kaufman, Jonathan P.
United States, La Jolla
University of California, San Diego
Miller, Nathan J.
United States, Greenbelt
Nasa Goddard Space Flight Center
Shimon, Meir
United States, La Jolla
University of California, San Diego
Israel, Tel Aviv-yafo
Tel Aviv University
Barkats, Denis A.
Chile, Santiago
European Southern Observatory Santiago
Bischoff, Colin A.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Buder, Immanuel
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Keating, Brian G.
United States, La Jolla
University of California, San Diego
Kovac, John M.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Ade, Peter A.R.
United Kingdom, Cardiff
University of Wales
Aikin, R.
United States, Pasadena
California Institute of Technology
Battle, John O.
United States, Pasadena
Jet Propulsion Laboratory
Bierman, Evan M.
United States, La Jolla
University of California, San Diego
Bock, James J.
United States, Pasadena
California Institute of Technology
United States, Pasadena
Jet Propulsion Laboratory
Chiang, H. Cynthia
South Africa, Durban
University of Kwazulu-natal
Dowell, Charles Darren
United States, Pasadena
Jet Propulsion Laboratory
Duband, Lionel
France, Grenoble
Sbt
Filippini, Jeffrey P.
United States, Pasadena
California Institute of Technology
Hivon, Eric F.
France, Paris
Institut D’astrophysique de Paris
Holzapfel, William Laird
United States, Berkeley
University of California, Berkeley
Hristov, Viktor V.
United States, Pasadena
California Institute of Technology
Jones, William C.
United States, Princeton
Princeton University
Kernasovskiy, Sarah A.
United States, Palo Alto
Stanford University
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Kuo, Chaolin
United States, Palo Alto
Stanford University
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Leitch, Erik M.
United States, Chicago
The University of Chicago
Mason, Peter V.
United States, Pasadena
California Institute of Technology
Matsumura, Tomotake
Japan, Tsukuba
High Energy Accelerator Research Organization, Tsukuba
Nguyên, Hien Trong
United States, Pasadena
Jet Propulsion Laboratory
Ponthieu, Nicolas
France, Orsay
Institut D'astrophysique Spatiale
Pryke, Clement L.
United States, Minneapolis
University of Minnesota Twin Cities
Richter, Steffen
United States, Pasadena
California Institute of Technology
Rocha, Graça M.
United States, Pasadena
California Institute of Technology
United States, Pasadena
Jet Propulsion Laboratory
Sheehy, Christopher D.
United States, Chicago
The University of Chicago
Su, M.
United States, Cambridge
Massachusetts Institute of Technology
United States, Cambridge
Mit Kavli Institute for Astrophysics and Space Research
Takahashi, Yuki D.
United States, Berkeley
University of California, Berkeley
Tolan, J. E.
United States, Palo Alto
Stanford University
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Yoon, Ki-won
United States, Palo Alto
Stanford University
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Statistics
Citations: 56
Authors: 36
Affiliations: 21
Identifiers
Doi:
10.1103/PhysRevD.89.062006
ISSN:
15507998
e-ISSN:
15502368
Research Areas
Infectious Diseases