A Measurement of Gravitational Lensing of the Cosmic Microwave Background Using SPT-3G 2018 Data
Sigma
Strong gravitational lensing
South Pole Telescope
DOI:
10.48550/arxiv.2308.11608
Publication Date:
2023-01-01
AUTHORS (136)
ABSTRACT
We present a measurement of gravitational lensing over 1500 deg$^2$ the Southern sky using SPT-3G temperature data at 95 and 150 GHz taken in 2018. The amplitude relative to fiducial Planck 2018 $\Lambda$CDM cosmology is found be $1.020\pm0.060$, excluding instrumental astrophysical systematic uncertainties. conduct extensive null tests check robustness measurements, report minimum-variance combined power spectrum angular multipoles $50<L<2000$, which we use constrain cosmological models. When analyzed alone jointly with primary cosmic microwave background (CMB) spectra within model, our measurements are consistent from SPT-SZ, SPTpol, ACT, Planck. Incorporating loose priors on baryon density other parameters including uncertainties foreground bias template, obtain $1\sigma$ constraint $\sigma_8 \Omega_{\rm m}^{0.25}=0.595 \pm 0.026$ alone, where $\sigma_8$ common measure structure today $\Omega_{\rm m}$ matter parameter. Combining acoustic oscillation (BAO) data, derive parameter constraints = 0.810 0.033$, $S_8 \equiv \sigma_8(\Omega_{\rm m}/0.3)^{0.5}= 0.836 0.039$, Hubble constant $H_0 =68.8^{+1.3}_{-1.6}$ km s$^{-1}$ Mpc$^{-1}$. Using CMB anisotropy only, provide independent spatial curvature $\Omega_{K} 0.014^{+0.023}_{-0.026}$ (95% C.L.) dark energy $\Omega_\Lambda 0.722^{+0.031}_{-0.026}$ (68% C.L.). combining BAO find an upper limit sum neutrino masses $\sum m_{\nu}< 0.30$ eV
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