Measurement of the CMB temperature power spectrum and constraints on cosmology from the SPT-3G 2018 TT, TE, and EE dataset

Balkenhol, L., Dutcher, D., Spurio Mancini, A., Doussot, A., Benabed, K., Galli, S., Ade, P.A.R. ORCID: https://orcid.org/0000-0002-5127-0401, Anderson, A.J., Ansarinejad, B., Archipley, M., Bender, A.N., Benson, B.A., Bianchini, F., Bleem, L.E., Bouchet, F.R., Bryant, L., Camphuis, E., Carlstrom, J.E., Cecil, T.W., Chang, C.L., Chaubal, P., Chichura, P.M., Chou, T.L., Coerver, A., Crawford, T.M., Cukierman, A., Daley, C., de Haan, T., Dibert, K.R., Dobbs, M.A., Everett, W., Feng, C., Ferguson, K.R., Foster, A., Gambrel, A.E., Gardner, R.W., Goeckner-Wald, N., Gualtieri, R., Guidi, F., Guns, S., Halverson, N.W., Hivon, E., Holder, G.P., Holzapfel, W.L., Hood, J.C., Huang, N., Knox, L., Korman, M., Kuo, C.-L., Lee, A.T., Lowitz, A.E., Lu, C., Millea, M., Montgomery, J., Nakato, Y., Natoli, T., Noble, G.I., Novosad, V., Omori, Y., Padin, S., Pan, Z., Paschos, P., Prabhu, K., Quan, W., Rahimi, M., Rahlin, A., Reichardt, C.L., Rouble, M., Ruhl, J.E., Schiappucci, E., Smecher, G., Sobrin, J.A., Stark, A.A., Stephen, J., Suzuki, A., Tandoi, C., Thompson, K.L., Thorne, B., Tucker, C. ORCID: https://orcid.org/0000-0002-1851-3918, Umilta, C., Vieira, J.D., Wang, G., Whitehorn, N., Wu, W.L.K., Yefremenko, V., Young, M.R. and Zebrowski, J.A. 2023. Measurement of the CMB temperature power spectrum and constraints on cosmology from the SPT-3G 2018 TT, TE, and EE dataset. Physical Review D (particles, fields, gravitation, and cosmology) 108 (2) , 023510. 10.1103/PhysRevD.108.023510

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Abstract

We present a sample-variance-limited measurement of the temperature power spectrum ( T T ) of the cosmic microwave background using observations of a ∼ 1500     deg 2 field made by the SPT-3G in 2018. We report multifrequency power spectrum measurements at 95, 150, and 220 GHz covering the angular multipole range 750 ≤ ℓ < 3000 . We combine this T T 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 T T / T E / E E dataset. This is the first analysis to present cosmological constraints from SPT T T , T E , and E E power spectrum measurements jointly. We blind the cosmological results and subject the dataset 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 Λ CDM 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 T / T E / E E data are well fit by Λ CDM with a probability to exceed of 15%. For Λ CDM , we constrain the expansion rate today to H 0 = 68.3 ± 1.5km  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 dataset are within <1σ of each other. The addition of temperature data to the SPT-3G TE/EE power spectra improves constraints by 8–27% for each of the ΛCDM cosmological parameters. When additionally fitting AL, Neff, or Neff+YP, the posteriors of these parameters tighten by 5–24%. In the case of primordial magnetic fields, complete TT/TE/EE power spectrum measurements are necessary to break the degeneracy between b and ns, the spectral index of primordial density perturbations. We report a 95% confidence upper limit from SPT-3G data of b<1.0. The cosmological constraints in this work are the tightest from SPT primary power spectrum measurements to date and the analysis forms a new framework for future SPT analyses.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	American Physical Society
ISSN:	2470-0010
Date of First Compliant Deposit:	30 January 2024
Date of Acceptance:	7 June 2023
Last Modified:	02 Feb 2024 13:44
URI:	https://orca.cardiff.ac.uk/id/eprint/165926

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