A Comparison of Cosmological Parameters Determined from CMB Temperature Power Spectra from the South Pole Telescope and the Planck Satellite

• Published in: The Astrophysical Journal
• Main Authors: Aylor, K., Hou, Z., Knox, L., Story, K. T., Benson, B. A., Bleem, L. E., Carlstrom, J. E., Chang, C. L., Cho, H-M., Chown, R., Crawford, T. M., Crites, A. T., Haan, T. de, Dobbs, M. A., Everett, W. B., George, E. M., Halverson, N. W., Harrington, N. L., Holder, G. P., Holzapfel, W. L., Hrubes, J. D., Keisler, R., Lee, A. T. Univ. of California, Berkeley, CA . Department of Physics, Lawrence Berkeley National Lab. , Berkeley, CA . Physics Division, Leitch, E. M. Univ. of Chicago, IL . Kavli Institute for Cosmological Physics and Department of Astronomy and Astrophysics, Luong-Van, D. Univ. of Chicago, IL, Marrone, D. P. Univ. of Arizona, Tucson, AZ . Steward Observator, McMahon, J. J. Univ. of Michigan, Ann Arbor, MI . Department of Physics, Meyer, S. S. Univ. of Chicago, IL . Kavli Institute for Cosmological Physics, Department of Astronomy and Astrophysics, Department of Physics, and Enrico Fermi Institute, Millea, M. Univ. of California, Davis, CA . Department of Physics, Mocanu, L. M. Univ. of Chicago, IL . Kavli Institute for Cosmological Physics and Department of Astronomy and Astrophysics, Mohr, J. J. Ludwig-Maximilians-Universität, München . Faculty of Physics; Excellence Cluster Universe, Garching, Max-Planck-Institut für extraterrestrische Physik, Garching, Natoli, T. University of Toronto, ON . Dunlap Institute for Astronomy & Astrophysics, Omori, Y. McGill Univ., Montreal, QC . Department of Physics and McGill Space Institute, Padin, S. Univ. of Chicago, IL . Kavli Institute for Cosmological Physics and Department of Astronomy and Astrophysics, Pryke, C. Univ. of Chicago, IL . Kavli Institute for Cosmological Physics and Department of Astronomy and Astrophysics, Reichardt, C. L. Univ. of California, Berkeley, CA, University of Melbourne, Parkville, VIC . School of Physics, Ruhl, J. E. Case Western Reserve University, Cleveland, OH . Physics Department, Center for Education and Research in Cosmology and Astrophysics, Sayre, J. T. Univ. of Colorado, Boulder, CO . Center for Astrophysics and Space Astronomy, Department of Astrophysical and Planetary Sciences; Case Western Reserve University, Cleveland, OH . Physics Department, Center for Education and Research in Cosmology and Astrophysics, Schaffer, K. K. Univ. of Chicago, IL . Kavli Institute for Cosmological Physics and Enrico Fermi Institute; School of the Art Institute of Chicago, IL . Liberal Arts Department, Shirokoff, E. Univ. of Chicago, IL . Kavli Institute for Cosmological Physics and Department of Astronomy and Astrophysics; Univ. of California, Berkeley, CA . Department of Physics, Staniszewski, Z. Case Western Reserve University, Cleveland, OH . Physics Department, Center for Education and Research in Cosmology and Astrophysics; California Inst. of Technology , Pasadena, CA . Jet Propulsion Laboratory, Stark, A. A. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, Vanderlinde, K. University of Toronto, ON . Dunlap Institute for Astronomy & Astrophysics and Department of Astronomy & Astrophysics, Vieira, J. D. University of Illinois at Urbana-Champaign, Urbana, IL . Astronomy Department and Department of Physics, Williamson, R. Univ. of Chicago, IL . Kavli Institute for Cosmological Physics and Department of Astronomy and Astrophysics
• Language: unknown
• Published: 2022
• Subjects: 79 ASTRONOMY AND ASTROPHYSICS; Hubble; South Pole; South pole
• Online Access: http://www.osti.gov/servlets/purl/1419642; https://www.osti.gov/biblio/1419642; https://doi.org/10.3847/1538-4357/aa947b

The Planck cosmic microwave background temperature data are best fit with a ΛCDM model that mildly contradicts constraints from other cosmological probes. The South Pole Telescope (SPT) 2540 ${\deg }^{2}$ SPT-SZ survey offers measurements on sub-degree angular scales (multipoles $650\leqslant {\ell }\leqslant 2500$) with sufficient precision to use as an independent check of the Planck data. Here we build on the recent joint analysis of the SPT-SZ and Planck data in Hou et al. by comparing ΛCDM parameter estimates using the temperature power spectrum from both data sets in the SPT-SZ survey region. We also restrict the multipole range used in parameter fitting to focus on modes measured well by both SPT and Planck, thereby greatly reducing sample variance as a driver of parameter differences and creating a stringent test for systematic errors. We find no evidence of systematic errors from these tests. When we expand the maximum multipole of SPT data used, we see low-significance shifts in the angular scale of the sound horizon and the physical baryon and cold dark matter densities, with a resulting trend to higher Hubble constant. When we compare SPT and Planck data on the SPT-SZ sky patch to Planck full-sky data but keep the multipole range restricted, we find differences in the parameters n s and ${A}_{s}{e}^{-2\tau }$. We perform further checks, investigating instrumental effects and modeling assumptions, and we find no evidence that the effects investigated are responsible for any of the parameter shifts. Taken together, these tests reveal no evidence for systematic errors in SPT or Planck data in the overlapping sky coverage and multipole range and at most weak evidence for a breakdown of ΛCDM or systematic errors influencing either the Planck data outside the SPT-SZ survey area or the SPT data at ${\ell }\gt 2000$.