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A Measurement of the CMB Temperature Power Spectrum and Constraints on Cosmology from the SPT-3G 2018 TT/TE/EE Data Set
L. Balkenhol, D. Dutcher, A. Spurio Mancini, A. Doussot, K. Benabed, S. Galli, P. A. R. Ade, A. J. Anderson, B. Ansarinejad, M. Archipley, A. N. Bender, B. A. Benson, F. Bianchini, L. E. Bleem, F. R. Bouchet, L. Bryant, E. Camphuis, J. E. Carlstrom, T. W. Cecil, C. L. Chang, P. Chaubal, P. M. Chichura, T. -L. Chou, A. Coerver, T. M. Crawford, A. Cukierman, C. Daley, T. de Haan, K. R. Dibert, M. A. Dobbs, W. Everett, C. Feng, K. R. Ferguson, A. Foster, A. E. Gambrel, R. W. Gardner, N. Goeckner-Wald, R. Gualtieri, F. Guidi, S. Guns, N. W. Halverson, E. Hivon, G. P. Holder, W. L. Holzapfel, J. C. Hood, N. Huang, L. Knox, M. Korman, C. -L. Kuo, A. T. Lee, A. E. Lowitz, C. Lu, M. Millea, J. Montgomery, Y. Nakato, T. Natoli, G. I. Noble, V. Novosad, Y. Omori, S. Padin, Z. Pan, P. Paschos, K. Prabhu, W. Quan, M. Rahimi, A. Rahlin, C. L. Reichardt, M. Rouble, J. E. Ruhl, E. Schiappucci, G. Smecher, J. A. Sobrin, A. A. Stark, J. Stephen, A. Suzuki, C. Tandoi, K. L. Thompson, B. Thorne, C. Tucker, C. Umilta, J. D. Vieira, G. Wang, N. Whitehorn, W. L. K. Wu, V. Yefremenko, M. R. Young, J. A. Zebrowski
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We present a sample-variance-limited measurement of the temperature power spectrum (TT) of the cosmic microwave background (CMB) using observations of a ∼ 1500 deg² field made by SPT-3G in 2018. We report multifrequency power spectrum measurements at 95, 150, and 220GHz covering the angular multipole range 750 ≤ℓ< 3000. We combine this TT measurement with the published polarization power spectrum measurements from the 2018 observing season and update their associated covariance matrix to complete the SPT-3G 2018 TT/TE/EE data set. This is the first analysis to present cosmological constraints from SPT TT, TE, and EE power spectrum measurements jointly. We blind the cosmological results and subject the data set to a series of consistency tests at the power spectrum and parameter level. We find excellent agreement between frequencies and spectrum types and our results are robust to the modeling of astrophysical foregrounds. We report results for ΛCDM and a series of extensions, drawing on the following parameters: the amplitude of the gravitational lensing effect on primary power spectra A_L, the effective number of neutrino species N_(eff), the primordial helium abundance Y_P, and the baryon clumping factor due to primordial magnetic fields b. We find that the SPT-3G 2018 T/TE/EE data are well fit by ΛCDM with a probability-to-exceed of 15%. For ΛCDM, we constrain the expansion rate today to H₀ = 68.3 ±1.5 km s⁻¹ Mpc⁻¹ and the combined structure growth parameter to S₈ = 0.797 ±0.042. The SPT-based results are effectively independent of Planck, and the cosmological parameter constraints from either data set are within <1 σ of each other. (abridged)
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