| Summary: | 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 deg2 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 (ΛCDM), and to models with single-parameter extensions to ΛCDM. We find constraints that are comparable to and consistent with those found using the full-sky Planck CMB lensing data, e.g., σ_8 Ω^(0.25)_m = 0.598 ± 0.024 from the lensing data alone with weak priors placed on other parameters. Combining with primary CMB data, we explore single-parameter extensions to ΛCDM. We find Ω_k = -0.012^(+0.021)_(-0.023) 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^(øø), which scales only the amplitude of the lensing reconstruction power spectrum. We find A^(øø) x 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. © 2018 The American Astronomical Society. Received 2017 December 28; revised 2018 April 19; accepted 2018 May 1; published 2018 June 20. G.S. wishes to thank Elisa GM Ferreira, Joachim Harnois-Déraps and Alexander van Engelen for useful discussions and Jack Holder for digitization of the foreground model. We acknowledge the use of Alexander van Engelen's implementation of the analytical N^((1))_L bias in the flat-sky approximation. The ...
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