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Testing the ΛCDM Cosmological Model with Forthcoming Measurements of the Cosmic Microwave Background with SPT-3G

Journal Article · · Astrophys.J.
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  1. UC, Davis
  2. Illinois U., Urbana (main)
  3. UC, Berkeley
  4. Cardiff U.
  5. Fermilab; Chicago U., KICP; Chicago U., Astron. Astrophys. Ctr.
  6. Melbourne U.
  7. Illinois U., Urbana, Astron. Dept.; Illinois U., Urbana (main)
  8. Paris, Inst. Astrophys.
  9. Argonne; Chicago U., KICP; Chicago U., Astron. Astrophys. Ctr.
  10. KIPAC, Menlo Park; Stanford U., HEPL; Stanford U.; SLAC
  11. Argonne; Chicago U., KICP
  12. Chicago U., EFI
  13. Chicago U., KICP; Chicago U., EFI; Argonne; Chicago U., Astron. Astrophys. Ctr.
  14. Argonne
  15. Chicago U., EFI; Chicago U., KICP
  16. Chicago U., KICP; Chicago U., Astron. Astrophys. Ctr.
  17. KIPAC, Menlo Park; Stanford U., HEPL; SLAC; Stanford U.
  18. Illinois U., Urbana, Astron. Dept.
  19. KEK, Tsukuba
  20. Chicago U., Astron. Astrophys. Ctr.; Chicago U., KICP
  21. McGill U.; Canadian Inst. Advanced Res.
  22. Princeton U.
  23. Colorado U.
  24. Illinois U., Urbana
  25. UCLA
  26. Chicago U., KICP
  27. Stanford U.; KIPAC, Menlo Park; Stanford U., HEPL
  28. Northwestern U.
  29. Case Western Reserve U.
  30. UC, Berkeley; LBL, Berkeley
  31. McGill U.
  32. Stanford U.
  33. U. Toronto, Dunlap Inst. Astron. Astrophys.
  34. Chicago U., KICP; Caltech
  35. Argonne; Chicago U., KICP; Chicago U., EFI
  36. Fermilab; Chicago U., KICP
  37. Unlisted, CA
  38. Harvard-Smithsonian Ctr. Astrophys.
  39. LBL, Berkeley
  40. Illinois U., Urbana, Astron. Dept.; Illinois U., Urbana; Illinois U., Urbana (main)
  41. Michigan State U.
  42. KIPAC, Menlo Park; Stanford U., HEPL; SLAC
  43. Chicago U., KICP; Chicago U., Astron. Astrophys. Ctr.; Fermilab
+ Show Author Affiliations

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 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 12μK-armin, respectively, in cosmic microwave background (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 ∼2times higher than the temperature noise. We use a novel approach to obtain the covariance matrices for jointly and optimally estimated gravitational lensing potential band powers and unlensed CMB temperature and polarization band powers. We demonstrate the ability to test the ΛCDM model via the consistency of cosmological parameters constrained independently from SPT-3G and Planck data, and consider the improvement in constraints on ΛCDM extension parameters from a joint analysis of SPT-3G and Planck data. The ΛCDM 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.

Research Organization:
Northwestern U.; Harvard-Smithsonian Ctr. Astrophys.; Argonne National Laboratory (ANL), Argonne, IL (United States); Unlisted, CA; Paris, Inst. Astrophys.; UC, Davis; KEK, Tsukuba; Canadian Inst. Advanced Res.; Case Western Reserve U.; UC, Berkeley; Colorado U.; U. Toronto, Dunlap Inst. Astron. Astrophys.; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Illinois U., Urbana, Astron. Dept.; Melbourne U.; Michigan State U.; Stanford U., HEPL; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Princeton U.; Illinois U., Urbana (main); Chicago U., Astron. Astrophys. Ctr.; UCLA; Cardiff U.; Illinois U., Urbana; SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); McGill U.; Chicago U., KICP; Stanford U.; Caltech; Chicago U., EFI
Sponsoring Organization:
US Department of Energy
Grant/Contract Number:
AC02-07CH11359; 89243024CSC000002
OSTI ID:
2349034
Report Number(s):
FERMILAB-PUB-24-0175-PPD; oai:inspirehep.net:2771903; arXiv:2403.17925
Journal Information:
Astrophys.J., Journal Name: Astrophys.J. Journal Issue: 1 Vol. 973
Country of Publication:
United States
Language:
English

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79 ASTRONOMY AND ASTROPHYSICS
Cosmic microwave background radiation
Cosmological parameters