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CMB polarization systematics due to beam asymmetry: Impact on inflationary science

Shimon, Meir and Keating, Brian and Ponthieu, Nicolas and Hivon, Eric (2008) CMB polarization systematics due to beam asymmetry: Impact on inflationary science. Physical Review D, 77 (8). Art. No. 083003. ISSN 2470-0010. doi:10.1103/PhysRevD.77.083003.

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Cosmic microwave background (CMB) polarization provides a unique window into cosmological inflation; the amplitude of the B-mode polarization from last scattering is uniquely sensitive to the energetics of inflation. However, numerous systematic effects arising from optical imperfections can contaminate the observed B-mode power spectrum. In particular, systematic effects due to the coupling of the underlying temperature and polarization fields with elliptical or otherwise asymmetric beams yield spurious systematic signals. This paper presents a nonperturbative analytic calculation of some of these signals. We show that results previously derived in real space can be generalized, formally, by including infinitely many higher-order corrections to the leading order effects. These corrections can be summed and represented as analytic functions when a fully Fourier-space approach is adopted from the outset. The formalism and results presented in this paper were created to determine the susceptibility of CMB polarization probes of the primary gravitational wave signal but can be easily extended to the analysis of gravitational lensing of the CMB.

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Additional Information:©2008 The American Physical Society. (Received 10 September 2007; revised 18 March 2008; published 7 April 2008) We wish to acknowledge fruitful discussions with Jamie Bock and the EPIC working group. M.S. would like to thank Evan Bierman, Nathan Miller, Tom Renbarger, and John Kovac for useful discussions. B. K. gratefully acknowledges support from NSF PECASE Award No. AST-0548262 and a NASA Einstein Probe Mission Study Grant No. 785.90.00.04 "The Experimental Probe of Inflationary Cosmology (EPIC)." We acknowledge using CAMB to calculate the power spectra of the underlying sky presented in this work.
Issue or Number:8
Record Number:CaltechAUTHORS:SHIprd08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10086
Deposited By: Archive Administrator
Deposited On:11 Apr 2008
Last Modified:08 Nov 2021 21:04

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