Kavli Affiliate: Chao-Lin Kuo
| First 5 Authors: A. Vitrier, A. Vitrier, , ,
| Summary:
The South Pole Telescope (SPT), using its third-generation camera, SPT-3G, is
conducting observations of the cosmic microwave background (CMB) in temperature
and polarization across approximately 10 000 deg$^2$ of the sky at 95, 150, and
220 GHz. This comprehensive dataset should yield stringent constraints on
cosmological parameters. In this work, we explore its potential to address the
Hubble tension by forecasting constraints from temperature, polarization, and
CMB lensing on Early Dark Energy (EDE) and the variation in electron mass in
spatially flat and curved universes. For this purpose, we investigate first
whether analyzing the distinct SPT-3G observation fields independently, as
opposed to as a single, unified region, results in a loss of information
relevant to cosmological parameter estimation. We develop a realistic
temperature and polarization likelihood pipeline capable of analyzing these
fields in these two ways, and subsequently forecast constraints on cosmological
parameters. Our findings indicate that any loss of constraining power from
analyzing the fields separately is primarily concentrated at low multipoles
($ell$ < 50) and the overall impact on the relative uncertainty on standard
$Lambda$CDM parameters is minimal (< 3%). Our forecasts suggest that SPT-3G
data should improve by more than a factor of 200 and 3000 the Figure of Merit
(FoM) of the EDE and the varying electron mass models, respectively, when
combined with Planck data. The likelihood pipeline developed and used in this
work is made publicly available online.
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