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arXiv · 2403.17925

Testing the $\mathbf{\Lambda}$CDM Cosmological Model with Forthcoming Measurements of the Cosmic Microwave Background with SPT-3G

K. Prabhu·S. Raghunathan·M. Millea·G. Lynch·P. A. R. Ade·E. Anderes·A. J. Anderson·B. Ansarinejad·M. Archipley·L. Balkenhol·K. Benabed·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·A. Doussot·D. Dutcher·W. Everett·C. Feng·K. R. Ferguson·K. Fichman·A. Foster·S. Galli·A. E. Gambrel·R. W. Gardner·F. Ge·N. Goeckner-Wald·R. Gualtieri·F. Guidi·S. Guns·N. W. Halverson·E. Hivon·G. P. Holder·W. L. Holzapfel·J. C. Hood·A. Hryciuk·N. Huang·F. Kéruzoré·L. Knox·M. Korman·K. Kornoelje·C. -L. Kuo·A. T. Lee·K. Levy·A. E. Lowitz·C. Lu·A. Maniyar·F. Menanteau·J. Montgomery·Y. Nakato·T. Natoli·G. I. Noble·V. Novosad·Y. Omori·S. Padin·Z. Pan·P. Paschos·K. A. Phadke·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. Trendafilova·C. Tucker·C. Umilta·A. Vitrier·J. D. Vieira·Y. Wan·G. Wang·N. Whitehorn·W. L. K. Wu·V. Yefremenko·M. R. Young
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Abstract

We forecast constraints on cosmological parameters enabled by three surveys conducted with SPT-3G, the third-generation camera on the South Pole Telescope. The surveys cover separate regions of 1500, 2650, and 6000 ${\rm deg}^{2}$ to different depths, in total observing 25% of the sky. These regions will be measured to white noise levels of roughly 2.5, 9, and 12 $\mu{\rm K-arcmin}$, respectively, in CMB temperature units at 150 GHz by the end of 2024. The survey also includes measurements at 95 and 220 GHz, which have noise levels a factor of ~1.2 and 3.5 times higher than 150 GHz, respectively, with each band having a polarization noise level ~$\sqrt{\text{2}}$ times higher than the temperature noise. We use a novel approach to obtain the covariance matrices for jointly and optimally estimated gravitational lensing potential bandpowers and unlensed CMB temperature and polarization bandpowers. We demonstrate the ability to test the $\Lambda{\rm CDM}$ model via the consistency of cosmological parameters constrained independently from SPT-3G and Planck data, and consider the improvement in constraints on $\Lambda{\rm CDM}$ extension parameters from a joint analysis of SPT-3G and Planck data. The $\Lambda{\rm CDM}$ cosmological parameters are typically constrained with uncertainties up to ~2 times smaller with SPT-3G data, compared to Planck, with the two data sets measuring significantly different angular scales and polarization levels, providing additional tests of the standard cosmological model.

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K. Prabhu, S. Raghunathan, M. Millea, G. Lynch, P. A. R. Ade, E. Anderes, A. J. Anderson, B. Ansarinejad, M. Archipley, L. Balkenhol, K. Benabed, 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, A. Doussot, D. Dutcher, W. Everett, C. Feng, K. R. Ferguson, K. Fichman, A. Foster, S. Galli, A. E. Gambrel, R. W. Gardner, F. Ge, N. Goeckner-Wald, R. Gualtieri, F. Guidi, S. Guns, N. W. Halverson, E. Hivon, G. P. Holder, W. L. Holzapfel, J. C. Hood, A. Hryciuk, N. Huang, F. Kéruzoré, L. Knox, M. Korman, K. Kornoelje, C. -L. Kuo, A. T. Lee, K. Levy, A. E. Lowitz, C. Lu, A. Maniyar, F. Menanteau, J. Montgomery, Y. Nakato, T. Natoli, G. I. Noble, V. Novosad, Y. Omori, S. Padin, Z. Pan, P. Paschos, K. A. Phadke, 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. Trendafilova, C. Tucker, C. Umilta, A. Vitrier, J. D. Vieira, Y. Wan, G. Wang, N. Whitehorn, W. L. K. Wu, V. Yefremenko, M. R. Young. 2024-03-26. Testing the $\mathbf{\Lambda}$CDM Cosmological Model with Forthcoming Measurements of the Cosmic Microwave Background with SPT-3G. https://arxiv.org/abs/2403.17925

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