Revision 2

Accepted · core change · record

Changes against revision 1:

Title: Atom interferometry determination of G at 10 ppm
Plain: Atoms in free fall make test masses that cannot twist, stretch or be magnetized like a pendulum fiber, so they could give G free of the usual suspects. Their best result so far is about ten times less precise than needed.
Precise · changed · core: Revision 1: Atom-interferometric gravity gradiometry with well-characterized source masses gave G with about 150 ppm uncertainty (Rosi et al 2014). Determine G with uncertainty below 1e-5 relative by a cold-atom method, sufficient to discriminate among the discrepant macroscopic results.; Revision 2: Atom-interferometric gravity gradiometry with well-characterized source masses gave G with about 150 ppm uncertainty (Rosi et al 2014). Determine G with uncertainty below $10^{-5}$ relative by a cold-atom method, sufficient to discriminate among the discrepant macroscopic results.
Settled by: A cold-atom G measurement with total uncertainty below 10 ppm and a published complete error budget.
Kind: well-posed
Answer type: value
References: (empty)
Literature status: open
Status note: (empty)
Posed since: (empty)

Decisions