CMB Polarization B-mode Delensing with SPTpol and Herschel

A. Manzotti; K. T. Story; W. L.K. Wu; J. E. Austermann; J. A. Beall; A. N. Bender; B. A. Benson; L. E. Bleem; J. J. Bock; J. E. Carlstrom; C. L. Chang; H. C. Chiang; H. M. Cho; R. Citron; A. Conley; T. M. Crawford; A. T. Crites; T. De Haan; M. A. Dobbs; S. Dodelson; W. Everett; J. Gallicchio; E. M. George; A. Gilbert; N. W. Halverson; N. Harrington; J. W. Henning; G. C. Hilton; G. P. Holder; W. L. Holzapfel; S. Hoover; Z. Hou; J. D. Hrubes; N. Huang; J. Hubmayr; K. D. Irwin; R. Keisler; L. Knox; A. T. Lee; E. M. Leitch; D. Li; J. J. McMahon; S. S. Meyer; L. M. Mocanu; T. Natoli; J. P. Nibarger; V. Novosad; S. Padin; C. Pryke; C. L. Reichardt; J. E. Ruhl; B. R. Saliwanchik; J. T. Sayre; K. K. Schaffer; G. Smecher; A. A. Stark; K. Vanderlinde; J. D. Vieira; M. P. Viero; G. Wang; N. Whitehorn; V. Yefremenko; M. Zemcov

doi:10.3847/1538-4357/aa82bb

CMB Polarization B-mode Delensing with SPTpol and Herschel

A. Manzotti, K. T. Story, W. L.K. Wu, J. E. Austermann, J. A. Beall, A. N. Bender, B. A. Benson, L. E. Bleem, J. J. Bock, J. E. Carlstrom, C. L. Chang, H. C. Chiang, H. M. Cho, R. Citron, A. Conley, T. M. Crawford, A. T. Crites, T. De Haan, M. A. Dobbs, S. DodelsonW. Everett, J. Gallicchio, E. M. George, A. Gilbert, N. W. Halverson, N. Harrington, J. W. Henning, G. C. Hilton, G. P. Holder, W. L. Holzapfel, S. Hoover, Z. Hou, J. D. Hrubes, N. Huang, J. Hubmayr, K. D. Irwin, R. Keisler, L. Knox, A. T. Lee, E. M. Leitch, D. Li, J. J. McMahon, S. S. Meyer, L. M. Mocanu, T. Natoli, J. P. Nibarger, V. Novosad, S. Padin, C. Pryke, C. L. Reichardt, J. E. Ruhl, B. R. Saliwanchik, J. T. Sayre, K. K. Schaffer, G. Smecher, A. A. Stark, K. Vanderlinde, J. D. Vieira, M. P. Viero, G. Wang, N. Whitehorn, V. Yefremenko, M. Zemcov

Physics and Astronomy (Twin Cities)

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Abstract

We present a demonstration of delensing the observed cosmic microwave background (CMB) B-mode polarization anisotropy. This process of reducing the gravitational-lensing-generated B-mode component will become increasingly important for improving searches for the B modes produced by primordial gravitational waves. In this work, we delens B-mode maps constructed from multi-frequency SPTpol observations of a 90 deg² patch of sky by subtracting a B-mode template constructed from two inputs: SPTpol E-mode maps and a lensing potential map estimated from the Herschel 500 μm map of the cosmic infrared background. We find that our delensing procedure reduces the measured B-mode power spectrum by % in the multipole range 300 < ℓ < 2300; this is shown to be consistent with expectations from simulations and to be robust against systematics. The null hypothesis of no delensing is rejected at 6.9σ. Furthermore, we build and use a suite of realistic simulations to study the general properties of the delensing process and find that the delensing efficiency achieved in this work is limited primarily by the noise in the lensing potential map. We demonstrate the importance of including realistic experimental non-idealities in the delensing forecasts used to inform instrument and survey-strategy planning of upcoming lower-noise experiments, such as CMB-S4.

Original language	English (US)
Article number	45
Journal	Astrophysical Journal
Volume	846
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/aa82bb
State	Published - Sep 1 2017

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© 2017. The American Astronomical Society. All rights reserved.

Keywords

cosmic background radiation
cosmology: observations
early universe
inflation

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Manzotti, A., Story, K. T., Wu, W. L. K., Austermann, J. E., Beall, J. A., Bender, A. N., Benson, B. A., Bleem, L. E., Bock, J. J., Carlstrom, J. E., Chang, C. L., Chiang, H. C., Cho, H. M., Citron, R., Conley, A., Crawford, T. M., Crites, A. T., De Haan, T., Dobbs, M. A., ... Zemcov, M. (2017). CMB Polarization B-mode Delensing with SPTpol and Herschel. Astrophysical Journal, 846(1), Article 45. https://doi.org/10.3847/1538-4357/aa82bb

Manzotti, A, Story, KT, Wu, WLK, Austermann, JE, Beall, JA, Bender, AN, Benson, BA, Bleem, LE, Bock, JJ, Carlstrom, JE, Chang, CL, Chiang, HC, Cho, HM, Citron, R, Conley, A, Crawford, TM, Crites, AT, De Haan, T, Dobbs, MA, Dodelson, S, Everett, W, Gallicchio, J, George, EM, Gilbert, A, Halverson, NW, Harrington, N, Henning, JW, Hilton, GC, Holder, GP, Holzapfel, WL, Hoover, S, Hou, Z, Hrubes, JD, Huang, N, Hubmayr, J, Irwin, KD, Keisler, R, Knox, L, Lee, AT, Leitch, EM, Li, D, McMahon, JJ, Meyer, SS, Mocanu, LM, Natoli, T, Nibarger, JP, Novosad, V, Padin, S, Pryke, C, Reichardt, CL, Ruhl, JE, Saliwanchik, BR, Sayre, JT, Schaffer, KK, Smecher, G, Stark, AA, Vanderlinde, K, Vieira, JD, Viero, MP, Wang, G, Whitehorn, N, Yefremenko, V & Zemcov, M 2017, 'CMB Polarization B-mode Delensing with SPTpol and Herschel', Astrophysical Journal, vol. 846, no. 1, 45. https://doi.org/10.3847/1538-4357/aa82bb

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title = "CMB Polarization B-mode Delensing with SPTpol and Herschel",

abstract = "We present a demonstration of delensing the observed cosmic microwave background (CMB) B-mode polarization anisotropy. This process of reducing the gravitational-lensing-generated B-mode component will become increasingly important for improving searches for the B modes produced by primordial gravitational waves. In this work, we delens B-mode maps constructed from multi-frequency SPTpol observations of a 90 deg2 patch of sky by subtracting a B-mode template constructed from two inputs: SPTpol E-mode maps and a lensing potential map estimated from the Herschel 500 μm map of the cosmic infrared background. We find that our delensing procedure reduces the measured B-mode power spectrum by % in the multipole range 300 < ℓ < 2300; this is shown to be consistent with expectations from simulations and to be robust against systematics. The null hypothesis of no delensing is rejected at 6.9σ. Furthermore, we build and use a suite of realistic simulations to study the general properties of the delensing process and find that the delensing efficiency achieved in this work is limited primarily by the noise in the lensing potential map. We demonstrate the importance of including realistic experimental non-idealities in the delensing forecasts used to inform instrument and survey-strategy planning of upcoming lower-noise experiments, such as CMB-S4.",

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author = "A. Manzotti and Story, {K. T.} and Wu, {W. L.K.} and Austermann, {J. E.} and Beall, {J. A.} and Bender, {A. N.} and Benson, {B. A.} and Bleem, {L. E.} and Bock, {J. J.} and Carlstrom, {J. E.} and Chang, {C. L.} and Chiang, {H. C.} and Cho, {H. M.} and R. Citron and A. Conley and Crawford, {T. M.} and Crites, {A. T.} and {De Haan}, T. and Dobbs, {M. A.} and S. Dodelson and W. Everett and J. Gallicchio and George, {E. M.} and A. Gilbert and Halverson, {N. W.} and N. Harrington and Henning, {J. W.} and Hilton, {G. C.} and Holder, {G. P.} and Holzapfel, {W. L.} and S. Hoover and Z. Hou and Hrubes, {J. D.} and N. Huang and J. Hubmayr and Irwin, {K. D.} and R. Keisler and L. Knox and Lee, {A. T.} and Leitch, {E. M.} and D. Li and McMahon, {J. J.} and Meyer, {S. S.} and Mocanu, {L. M.} and T. Natoli and Nibarger, {J. P.} and V. Novosad and S. Padin and C. Pryke and Reichardt, {C. L.} and Ruhl, {J. E.} and Saliwanchik, {B. R.} and Sayre, {J. T.} and Schaffer, {K. K.} and G. Smecher and Stark, {A. A.} and K. Vanderlinde and Vieira, {J. D.} and Viero, {M. P.} and G. Wang and N. Whitehorn and V. Yefremenko and M. Zemcov",

year = "2017",

month = sep,

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doi = "10.3847/1538-4357/aa82bb",

language = "English (US)",

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T1 - CMB Polarization B-mode Delensing with SPTpol and Herschel

AU - Manzotti, A.

AU - Story, K. T.

AU - Wu, W. L.K.

AU - Austermann, J. E.

AU - Beall, J. A.

AU - Bender, A. N.

AU - Benson, B. A.

AU - Bleem, L. E.

AU - Bock, J. J.

AU - Carlstrom, J. E.

AU - Chang, C. L.

AU - Chiang, H. C.

AU - Cho, H. M.

AU - Citron, R.

AU - Conley, A.

AU - Crawford, T. M.

AU - Crites, A. T.

AU - De Haan, T.

AU - Dobbs, M. A.

AU - Dodelson, S.

AU - Everett, W.

AU - Gallicchio, J.

AU - George, E. M.

AU - Gilbert, A.

AU - Halverson, N. W.

AU - Harrington, N.

AU - Henning, J. W.

AU - Hilton, G. C.

AU - Holder, G. P.

AU - Holzapfel, W. L.

AU - Hoover, S.

AU - Hou, Z.

AU - Hrubes, J. D.

AU - Huang, N.

AU - Hubmayr, J.

AU - Irwin, K. D.

AU - Keisler, R.

AU - Knox, L.

AU - Lee, A. T.

AU - Leitch, E. M.

AU - Li, D.

AU - McMahon, J. J.

AU - Meyer, S. S.

AU - Mocanu, L. M.

AU - Natoli, T.

AU - Nibarger, J. P.

AU - Novosad, V.

AU - Padin, S.

AU - Pryke, C.

AU - Reichardt, C. L.

AU - Ruhl, J. E.

AU - Saliwanchik, B. R.

AU - Sayre, J. T.

AU - Schaffer, K. K.

AU - Smecher, G.

AU - Stark, A. A.

AU - Vanderlinde, K.

AU - Vieira, J. D.

AU - Viero, M. P.

AU - Wang, G.

AU - Whitehorn, N.

AU - Yefremenko, V.

AU - Zemcov, M.

PY - 2017/9/1

Y1 - 2017/9/1

N2 - We present a demonstration of delensing the observed cosmic microwave background (CMB) B-mode polarization anisotropy. This process of reducing the gravitational-lensing-generated B-mode component will become increasingly important for improving searches for the B modes produced by primordial gravitational waves. In this work, we delens B-mode maps constructed from multi-frequency SPTpol observations of a 90 deg2 patch of sky by subtracting a B-mode template constructed from two inputs: SPTpol E-mode maps and a lensing potential map estimated from the Herschel 500 μm map of the cosmic infrared background. We find that our delensing procedure reduces the measured B-mode power spectrum by % in the multipole range 300 < ℓ < 2300; this is shown to be consistent with expectations from simulations and to be robust against systematics. The null hypothesis of no delensing is rejected at 6.9σ. Furthermore, we build and use a suite of realistic simulations to study the general properties of the delensing process and find that the delensing efficiency achieved in this work is limited primarily by the noise in the lensing potential map. We demonstrate the importance of including realistic experimental non-idealities in the delensing forecasts used to inform instrument and survey-strategy planning of upcoming lower-noise experiments, such as CMB-S4.

AB - We present a demonstration of delensing the observed cosmic microwave background (CMB) B-mode polarization anisotropy. This process of reducing the gravitational-lensing-generated B-mode component will become increasingly important for improving searches for the B modes produced by primordial gravitational waves. In this work, we delens B-mode maps constructed from multi-frequency SPTpol observations of a 90 deg2 patch of sky by subtracting a B-mode template constructed from two inputs: SPTpol E-mode maps and a lensing potential map estimated from the Herschel 500 μm map of the cosmic infrared background. We find that our delensing procedure reduces the measured B-mode power spectrum by % in the multipole range 300 < ℓ < 2300; this is shown to be consistent with expectations from simulations and to be robust against systematics. The null hypothesis of no delensing is rejected at 6.9σ. Furthermore, we build and use a suite of realistic simulations to study the general properties of the delensing process and find that the delensing efficiency achieved in this work is limited primarily by the noise in the lensing potential map. We demonstrate the importance of including realistic experimental non-idealities in the delensing forecasts used to inform instrument and survey-strategy planning of upcoming lower-noise experiments, such as CMB-S4.

KW - cosmic background radiation

KW - cosmology: observations

KW - early universe

KW - inflation

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DO - 10.3847/1538-4357/aa82bb

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SN - 0004-637X

VL - 846

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 45

ER -

CMB Polarization B-mode Delensing with SPTpol and Herschel

Abstract

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