Exploring ${\Lambda}$CDM extensions with SPT-3G and Planck data: 4$\sigma$ evidence for neutrino masses and implications of extended dark energy models for cosmological tensions

Understand

We present new cosmological constraints in a set of motivated extensions of the $\Lambda$CDM model using the polarization and gravitational lensing measurements from the South Pole Telescope and the Planck CMB temperature observations at large angular scales.

• In all cosmological scenarios, this CMB data brings the clustering measurements into agreement with the low-redshift probes of large-scale structure.
• Combining the SPT-3G, SPTpol and Planck large-scale temperature data with the latest full-shape BOSS and BAO measurements, information from the weak lensing and photometric galaxy clustering, and Pantheon supernova set we find a $4\sigma$ evidence for nonzero neutrino mass, $\sum m_\nu=0.22\pm0.06\,{\rm eV}$.Breaking the CMB degeneracies between $\sum m_\nu$ and the cosmological parameters by the BOSS data is a major contribution to our neutrino mass measurement.
• The future CMB data would allow for investigating this measurement.