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H0 tension: South Pole-arization edition with SPT-3G

1 Apr 2021, 19:31 UTC
H0 tension: South Pole-arization edition with SPT-3G
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Title: Constraints on ΛCDM Extensions from the SPT-3G 2018 EE and TE Power SpectraAuthors: L. Balkenhol, D. Dutcher, et al. (SPT-3G Collaboration)First Author’s Institution: School of Physics, University of Melbourne, Parkville, VIC 3010, AustraliaStatus: Submitted to Physical Review DIf you’ve been paying at-*tension* to cosmology recently, you may have heard about the Hubble tension, or the disagreement of the local (distance ladder) and cosmic microwave background (CMB)-based measurements of the hubble parameter H0. This thrilling mystery has kept many of us at astrobites on the edge of our seats for quite some time – if you don’t believe me, see here, here, here, here, here, here, here, here, here, and here. There’s a good reason for this – which is that the tension still hasn’t gone away! More data has come in on both the local and CMB sides (and everywhere in between), but still no widely accepted systematic effect has been identified that could cause the discrepancy. To make things worse, more theory-oriented cosmologists have had a very tough time coming up with a plausible physical mechanism beyond the standard cosmological model (flat ΛCDM) that can ease the tension.Today’s paper will take us to the South Pole and provide ...

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