# New curvature constraints

1. Aug 12, 2015

### Chronos

This paper;http://arxiv.org/abs/1508.02469 ,Geometrical Constraint on Curvature with BAO experiments, suggests an improvement of curvature constraints on the geometry of the universe. On a purely geometric basis the authors' measurements suggest $$σ(ΩK) \simeq0.006$$ The GR+Λ case yields a value of $$σ(ΩK) \simeq0.0009$$ Pretty flat either way. The interesting thing about this approach is combining the radial and angular diameter distances allows them to constrain spatial curvature without employing much assumption about theory of structure formation other than the BAO scale such as galaxy bias nor any model of dark energy.

2. Aug 13, 2015

### Staff: Mentor

So is the consensus that we are as flat as a pancake, flatter than a pancake, or a waffle?

3. Aug 13, 2015

### Chronos

I was thinking crepe.

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