Constraints on Cosmological Parameters from the Angular Power Spectrum of a Combined 2500 deg^{2} SPTSZ and Planck Gravitational Lensing Map
Abstract
We report constraints on cosmological parameters from the angular power spectrum of a cosmic microwave background (CMB) gravitational lensing potential map created using temperature data from 2500 deg^{2} of South Pole Telescope (SPT) data supplemented with data from Planck in the same sky region, with the statistical power in the combined map primarily from the SPT data. We fit the lensing power spectrum to a model including cold dark matter and a cosmological constant ({{Λ }}{CDM}), and to models with singleparameter extensions to {{Λ }}{CDM}. We find constraints that are comparable to and consistent with those found using the fullsky Planck CMB lensing data, e.g., {σ }_{8}{{{Ω }}}_{{{m}}}^{0.25} = 0.598 ± 0.024 from the lensing data alone with weak priors placed on other parameters. Combining with primary CMB data, we explore singleparameter extensions to {{Λ }}{CDM}. We find {{{Ω }}}_{k} ={0.012}_{0.023}^{+0.021} or {M}_{ν } < 0.70 eV at 95% confidence, in good agreement with results including the lensing potential as measured by Planck. We include two parameters that scale the effect of lensing on the CMB: {A}_{L}, which scales the lensing power spectrum in both the lens reconstruction power and in the smearing of the acoustic peaks, and {A}^{φ φ }, which scales only the amplitude of the lensing reconstruction power spectrum. We find {A}^{φ φ } × {A}_{L} = 1.01 ± 0.08 for the lensing map made from combined SPT and Planck data, indicating that the amount of lensing is in excellent agreement with expectations from the observed CMB angular power spectrum when not including the information from smearing of the acoustic peaks.
 Publication:

The Astrophysical Journal
 Pub Date:
 June 2018
 DOI:
 10.3847/15384357/aac264
 arXiv:
 arXiv:1712.07541
 Bibcode:
 2018ApJ...860..137S
 Keywords:

 cosmic background radiation;
 cosmological parameters;
 gravitational lensing: weak;
 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 12 pages, 7 figures, submitted to ApJ, typo in bandpower table corrected