*The Planck evidence for a closed Universe and a possible*
*crisis for cosmology*
https://arxiv.org/pdf/1911.02087.pdf

*What Shape Is the Universe? A New Study Suggests We’ve Got It All Wrong*
*When researchers reanalyzed the gold-standard data set of the early 
universe, they concluded that the cosmos must be “closed,” or curled up 
like a ball. Most others remain unconvinced.*
https://www.quantamagazine.org/what-shape-is-the-universe-closed-or-flat-20191104/

(It isn't clear what curvature parameter is being estimated.)

https://en.wikipedia.org/wiki/Lambda-CDM_model :

In the minimal 6-parameter Lambda-CDM model, it is assumed that curvature 
{\displaystyle \Omega _{k}}\Omega_k is 0

possible extensions of the simplest ΛCDM model allow for spatial curvature 
({\displaystyle \Omega _{tot}}\Omega _{{tot}} may be different from 1


@philipthrift

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