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    Constraints on Cosmological Parameters from the 500 deg(2) SPTPOL Lensing Power Spectrum

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    Author
    Bianchini, F; Wu, WLK; Ade, PAR; Anderson, AJ; Austermann, JE; Avva, JS; Beall, JA; Bender, AN; Benson, BA; Bleem, LE; ...
    Date
    2020-01-16
    Source Title
    Astrophysical Journal Supplement Series
    Publisher
    American Astronomical Society
    University of Melbourne Author/s
    Reichardt, Christian; Bianchini, Federico; Patil, Sanjaykumar; Gupta, Nikhel
    Affiliation
    School of Physics
    Academic Services and Registrar
    Metadata
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    Document Type
    Journal Article
    Citations
    Bianchini, F., Wu, W. L. K., Ade, P. A. R., Anderson, A. J., Austermann, J. E., Avva, J. S., Beall, J. A., Bender, A. N., Benson, B. A., Bleem, L. E., Carlstrom, J. E., Chang, C. L., Chaubal, P., Chiang, H. C., Citron, R., Moran, C. C., Crawford, T. M., Crites, A. T., de Haan, T. ,... Yefremenko, V. (2020). Constraints on Cosmological Parameters from the 500 deg(2) SPTPOL Lensing Power Spectrum. Astrophysical Journal, 888 (2), https://doi.org/10.3847/1538-4357/ab6082.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/251354
    DOI
    10.3847/1538-4357/ab6082
    Open Access URL
    https://arxiv.org/pdf/1910.07157
    ARC Grant code
    ARC/FT150100074
    Abstract
    We present cosmological constraints based on the cosmic microwave background (CMB) lensing potential power spectrum measurement from the recent 500 deg2 SPTpol survey, the most precise CMB lensing measurement from the ground to date. We fit a flat ΛCDM model to the reconstructed lensing power spectrum alone and in addition with other data sets: baryon acoustic oscillations (BAO), as well as primary CMB spectra from Planck and SPTpol. The cosmological constraints based on SPTpol and Planck lensing band powers are in good agreement when analyzed alone and in combination with Planck full-sky primary CMB data. With weak priors on the baryon density and other parameters, the SPTpol CMB lensing data alone provide a 4% constraint on ${\sigma }_{8}{{\rm{\Omega }}}_{m}^{0.25}=0.593\pm 0.025$. Jointly fitting with BAO data, we find ${\sigma }_{8}=0.779\pm 0.023$, ${{\rm{\Omega }}}_{m}={0.368}_{-0.037}^{+0.032}$, and ${H}_{0}={72.0}_{-2.5}^{+2.1}\,\mathrm{km}\,{{\rm{s}}}^{-1}\,{\mathrm{Mpc}}^{-1}$, up to $2\sigma $ away from the central values preferred by Planck lensing + BAO. However, we recover good agreement between SPTpol and Planck when restricting the analysis to similar scales. We also consider single-parameter extensions to the flat ΛCDM model. The SPTpol lensing spectrum constrains the spatial curvature to be ${{\rm{\Omega }}}_{K}=-0.0007\pm 0.0025$ and the sum of the neutrino masses to be $\sum {m}_{\nu }\lt 0.23$ eV at 95% C.L. (with Planck primary CMB and BAO data), in good agreement with the Planck lensing results. With the differences in the signal-to-noise ratio of the lensing modes and the angular scales covered in the lensing spectra, this analysis represents an important independent check on the full-sky Planck lensing measurement.

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